{"id":2228,"date":"2022-07-18T19:21:21","date_gmt":"2022-07-18T19:21:21","guid":{"rendered":"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/?page_id=2228"},"modified":"2023-12-06T19:16:12","modified_gmt":"2023-12-06T19:16:12","slug":"jtrf2020-solution","status":"publish","type":"page","link":"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/solutions\/jtrf2020\/","title":{"rendered":"JTRF2020 Solution"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2228\" class=\"elementor elementor-2228\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-99b21f8 elementor-section-full_width elementor-section-height-min-height elementor-section-height-default elementor-section-items-middle\" data-id=\"99b21f8\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6c91673\" data-id=\"6c91673\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f33da80 elementor-widget elementor-widget-image\" data-id=\"f33da80\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/elementor\/thumbs\/JTRF_logo_w_shadow_2023-06-26_1500px-q8z6c1vdahsldgaewagtkjue60w793t9e2mo0pdsro.png\" title=\"JTRF_logo_w_shadow_2023-06-26_1500px\" alt=\"JTRF_logo_w_shadow_2023-06-26_1500px\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-95e47c8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"95e47c8\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-21a48c8\" data-id=\"21a48c8\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e3d370a elementor-widget elementor-widget-heading\" data-id=\"e3d370a\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<p class=\"elementor-heading-title elementor-size-default\">JTRF Solutions<\/p>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5c662b3 elementor-widget elementor-widget-heading\" data-id=\"5c662b3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">JTRF2020 Solution<\/h1>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e29103f elementor-section-content-middle elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e29103f\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-8fcb558\" data-id=\"8fcb558\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b69c601 elementor-widget elementor-widget-heading\" data-id=\"b69c601\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">About the JTRF2020 Solution<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-acd24f4 elementor-widget elementor-widget-text-editor\" data-id=\"acd24f4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>JTRF2020 is the Terrestrial Reference Frame (TRF) the Jet Propulsion Laboratory constructed by combining space geodetic inputs spanning 1979-2020 from Very Long Baseline Interferometry (VLBI), Satellite Laser Ranging (SLR), Global Navigation Satellite System (GNSS) and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) submitted for the determination of ITRF2020. Created through a square-root information filter (SRIF) and Dyer-McReynolds covariance smoother (DMCS) assimilating station position observations, Earth Orientation Parameters (EOPs), and local ties, JTRF2020 is a sub-secular, time series-based TRF whose origin is at the quasi-instantaneous center-of-mass (CM) of the Earth as sensed by SLR and whose scale is determined by the quasi-instantaneous VLBI and SLR scales.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-02206ad\" data-id=\"02206ad\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6185648 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"6185648\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-md\" href=\"https:\/\/doi.org\/10.5194\/egusphere-egu23-2117\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Learn More about JTRF2020<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-fdfe43e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"fdfe43e\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-74d41b0\" data-id=\"74d41b0\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a561ed3 elementor-widget elementor-widget-heading\" data-id=\"a561ed3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Extensions to the JTRF2020 Solution<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9b55c98 elementor-widget elementor-widget-text-editor\" data-id=\"9b55c98\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>A sequential estimation approach using a square-root information filter and Dyer-McReynolds covariance smoother was used to determine JTRF2020. An advantage of this approach is that the frame can be easily extended forward in time using new observations as they become available. The state vector and full covariance matrix can be saved at the end of the run. When new observations later become available, the filter can be re-started from the saved state, the new observations processed, and the extended state vector and covariance matrix saved again. Repeating this process allows the frame to be extended forward in time whenever new observations are available. Extensions to JTRF2020 are \u00a0being determined in this manner.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-dd8619a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"dd8619a\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ec9829a\" data-id=\"ec9829a\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-acdfff3 elementor-widget elementor-widget-heading\" data-id=\"acdfff3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What's New?<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f47eb76 elementor-widget elementor-widget-text-editor\" data-id=\"f47eb76\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>While KALREF was used to determine JTRF2014, a new software package, SREF (Square-root Reference frame Estimation Filter), was used to determine JTRF2020. New capabilities available in SREF that are not available in KALREF include the use of a variable time step\u00a0<span style=\"font-size: 1rem;\">which allows the input observations to be assimilated at the epoch of the observation, the use of a full process noise covariance matrix which allows regional correlations in station positions to be taken into account,<\/span><span style=\"font-style: inherit;\">\u00a0the use of a <\/span>postseismic<span style=\"font-style: inherit;\">\u00a0displacement model to improve the predicted motion of stations <\/span>affected<span style=\"font-style: inherit;\">\u00a0by large earthquakes, and the ability to jointly determine terrestrial and celestial reference frames. The following table compares the new JTRF2020 solution that was\u00a0<\/span>determined<span style=\"font-style: inherit;\">\u00a0using SREF to the previous JTRF2014 solution that was determined using KALREF.\u00a0<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-c13a45d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c13a45d\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-3a30b5f\" data-id=\"3a30b5f\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d519ff6 elementor-widget elementor-widget-heading\" data-id=\"d519ff6\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">JTRF2014<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6428f26 elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"6428f26\" data-element_type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Software: KALREF<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Number of Stations: 972<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;671 GNSS<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;159 DORIS<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;71 SLR<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;71 VLBI<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Temporal Resolution:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Weekly station positions, geocenter, scale<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Daily EOPs<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Time Span:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Frame-defining data set: 1979-2014<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Extension of frame past 2020: No<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Predictions past last extension: No<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Station Position Model:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Piecewise linear trend<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Annual and semiannual periodic<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-dd26f1d\" data-id=\"dd26f1d\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6fdc5b6 elementor-widget elementor-widget-heading\" data-id=\"6fdc5b6\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">JTRF2020<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c8b5c3f elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"c8b5c3f\" data-element_type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Software: SREF<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Number of Stations: 931<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;525 GNSS<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;194 DORIS<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;116 SLR<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;96 VLBI<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Temporal Resolution:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Daily station positions, geocenter, scale<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Daily EOPs<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Time Span:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Frame-defining data set: 1979-2020<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Extension of frame past 2020: Yes<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Predictions past last extension: 5 years<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Station Position Model:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Piecewise linear trend<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Annual periodic<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Postseismic displacement<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-2a35d1b elementor-section-content-middle elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"2a35d1b\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-b286552\" data-id=\"b286552\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-679a0bf elementor-widget elementor-widget-heading\" data-id=\"679a0bf\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Model<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6db43b7 elementor-widget elementor-widget-text-editor\" data-id=\"6db43b7\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"caret-color: rgba(50, 50, 50, 0.9); color: rgba(50, 50, 50, 0.9); font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 15px; text-align: justify;\">The software used to determine JTRF2020, SREF, fits a model to the station&#8217;s observations and uses that model to fill gaps in the station&#8217;s observing history, to forecast the position of the station after it stopped observing, and to hindcast its position before it started observing. For JTRF2020, the model consists of a piecewise linear trend, an annual periodic term, and a sum of exponential terms to represent postseismic motion for those stations that experience postseismic motion.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-3d4a7aa\" data-id=\"3d4a7aa\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-00cdde1 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"00cdde1\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-md\" href=\"https:\/\/doi.org\/10.5194\/egusphere-egu23-2117\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Learn More about the model<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a7e4097 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a7e4097\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-3f72a48\" data-id=\"3f72a48\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-de1794d elementor-widget elementor-widget-heading\" data-id=\"de1794d\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Stations and Sites<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a033d23 elementor-widget elementor-widget-text-editor\" data-id=\"a033d23\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>JTRF2020 consists of a set of position time series of 931 stations at daily intervals and daily combined EOPs along with their full covariance matrix. Since stations of different observing techniques are often co-located with each other at the same site, the 931 stations used to determine JTRF2020 are located at 489 sites on the Earth. <span style=\"font-style: inherit;\">Of these, 610 stations at 326 sites are located in the Northern hemisphere and 321 stations at 163 sites are located in the Southern hemisphere.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-4b3927a\" data-id=\"4b3927a\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6276fc6 elementor-align-justify elementor-mobile-align-center elementor-widget elementor-widget-button\" data-id=\"6276fc6\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-xl\" href=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2023\/06\/J2020WorldMap_FULL_72ppi_white_caption.png\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">View ALL Stations<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-126eeac elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"126eeac\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-25 elementor-top-column elementor-element elementor-element-7d63d84\" data-id=\"7d63d84\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c202460 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"c202460\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInDown&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2023\/06\/J2020WorldMap_GNSS_72ppi_white_caption.png\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/GNSS-150x150.webp\" class=\"elementor-animation-grow attachment-thumbnail size-thumbnail wp-image-2069\" alt=\"Global Navigation Satellite Systems (GNSS) Antenna\" srcset=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/GNSS-150x150.webp 150w, https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/GNSS.webp 256w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-66f5395 elementor-align-justify elementor-invisible elementor-widget elementor-widget-button\" data-id=\"66f5395\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeIn&quot;}\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2023\/06\/J2020WorldMap_GNSS_72ppi_white_caption.png\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">View GNSS Stations<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-25 elementor-top-column elementor-element elementor-element-f16d133\" data-id=\"f16d133\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1decc54 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"1decc54\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInDown&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2023\/06\/J2020WorldMap_VLBI_72ppi_white_caption.png\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/VLBI-150x150.webp\" class=\"elementor-animation-grow attachment-thumbnail size-thumbnail wp-image-2067\" alt=\"Very-long-baseline interferometry (VLBI) Radio Telescope\" srcset=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/VLBI-150x150.webp 150w, https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/VLBI.webp 256w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4b97ce6 elementor-align-justify elementor-invisible elementor-widget elementor-widget-button\" data-id=\"4b97ce6\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeIn&quot;}\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2023\/06\/J2020WorldMap_VLBI_72ppi_white_caption.png\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">View VLBI Stations<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-25 elementor-top-column elementor-element elementor-element-3838936\" data-id=\"3838936\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-766ce81 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"766ce81\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInDown&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2023\/06\/J2020WorldMap_SLR_72ppi_white_caption.png\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/SLR-150x150.webp\" class=\"elementor-animation-grow attachment-thumbnail size-thumbnail wp-image-2070\" alt=\"Satellite Laser Ranging (SLR) Station\" srcset=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/SLR-150x150.webp 150w, https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/SLR.webp 256w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-88dc569 elementor-align-justify elementor-invisible elementor-widget elementor-widget-button\" data-id=\"88dc569\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeIn&quot;}\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2023\/06\/J2020WorldMap_SLR_72ppi_white_caption.png\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">View SLR Stations<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-25 elementor-top-column elementor-element elementor-element-8e82028\" data-id=\"8e82028\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b553874 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"b553874\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInDown&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2023\/06\/J2020WorldMap_DORIS_72ppi_white_caption.png\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/DORIS-150x150.webp\" class=\"elementor-animation-grow attachment-thumbnail size-thumbnail wp-image-2068\" alt=\"Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) Antenna\" srcset=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/DORIS-150x150.webp 150w, https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/DORIS.webp 256w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a4323ef elementor-align-justify elementor-invisible elementor-widget elementor-widget-button\" data-id=\"a4323ef\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeIn&quot;}\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2023\/06\/J2020WorldMap_DORIS_72ppi_white_caption.png\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">View DORIS Stations<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-0f7535d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"0f7535d\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-25 elementor-top-column elementor-element elementor-element-cfd674d\" data-id=\"cfd674d\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0110a1f elementor-widget elementor-widget-counter\" data-id=\"0110a1f\" data-element_type=\"widget\" data-widget_type=\"counter.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-counter\">\n\t\t\t<div class=\"elementor-counter-title\">GNSS Stations<\/div>\t\t\t<div class=\"elementor-counter-number-wrapper\">\n\t\t\t\t<span class=\"elementor-counter-number-prefix\"><\/span>\n\t\t\t\t<span class=\"elementor-counter-number\" data-duration=\"2000\" data-to-value=\"525\" data-from-value=\"0\" data-delimiter=\",\">0<\/span>\n\t\t\t\t<span class=\"elementor-counter-number-suffix\"><\/span>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-25 elementor-top-column elementor-element elementor-element-08addb9\" data-id=\"08addb9\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-88a44e1 elementor-widget elementor-widget-counter\" data-id=\"88a44e1\" data-element_type=\"widget\" data-widget_type=\"counter.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-counter\">\n\t\t\t<div class=\"elementor-counter-title\">VLBI Stations<\/div>\t\t\t<div class=\"elementor-counter-number-wrapper\">\n\t\t\t\t<span class=\"elementor-counter-number-prefix\"><\/span>\n\t\t\t\t<span class=\"elementor-counter-number\" data-duration=\"2000\" data-to-value=\"96\" data-from-value=\"0\" data-delimiter=\",\">0<\/span>\n\t\t\t\t<span class=\"elementor-counter-number-suffix\"><\/span>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-25 elementor-top-column elementor-element elementor-element-3fe719f\" data-id=\"3fe719f\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e136644 elementor-widget elementor-widget-counter\" data-id=\"e136644\" data-element_type=\"widget\" data-widget_type=\"counter.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-counter\">\n\t\t\t<div class=\"elementor-counter-title\">SLR Stations<\/div>\t\t\t<div class=\"elementor-counter-number-wrapper\">\n\t\t\t\t<span class=\"elementor-counter-number-prefix\"><\/span>\n\t\t\t\t<span class=\"elementor-counter-number\" data-duration=\"2000\" data-to-value=\"116\" data-from-value=\"0\" data-delimiter=\",\">0<\/span>\n\t\t\t\t<span class=\"elementor-counter-number-suffix\"><\/span>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-25 elementor-top-column elementor-element elementor-element-c047a7e\" data-id=\"c047a7e\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-bf09f50 elementor-widget elementor-widget-counter\" data-id=\"bf09f50\" data-element_type=\"widget\" data-widget_type=\"counter.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-counter\">\n\t\t\t<div class=\"elementor-counter-title\">DORIS Stations<\/div>\t\t\t<div class=\"elementor-counter-number-wrapper\">\n\t\t\t\t<span class=\"elementor-counter-number-prefix\"><\/span>\n\t\t\t\t<span class=\"elementor-counter-number\" data-duration=\"2000\" data-to-value=\"194\" data-from-value=\"0\" data-delimiter=\",\">0<\/span>\n\t\t\t\t<span class=\"elementor-counter-number-suffix\"><\/span>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b69f747 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b69f747\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-06fe3ac\" data-id=\"06fe3ac\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e51c24a elementor-widget elementor-widget-image\" data-id=\"e51c24a\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/jtrf2020_map.webp\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"JTRF2020 Network Map\" data-elementor-lightbox-description=\"Preliminary map of the JTRF2020 stations\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MjAyOSwidXJsIjoiaHR0cHM6XC9cL2pzZ3QuanBsLm5hc2EuZ292XC9qdHJmXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDIyXC8wNVwvanRyZjIwMjBfbWFwLndlYnAifQ%3D%3D\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"602\" src=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/jtrf2020_map.webp\" class=\"attachment-full size-full wp-image-2029\" alt=\"Preliminary map of the JTRF2020 stations\" srcset=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/jtrf2020_map.webp 1000w, https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/jtrf2020_map-300x181.webp 300w, https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-content\/uploads\/2022\/05\/jtrf2020_map-768x462.webp 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Global space-geodetic network adopted in the JTRF2020 combination. Gold dots identify the GNSS sites, red circles represent VLBI sites, blue circles are SLR sites, and white circles denote DORIS sites. The global network comprises 525 GNSS stations, 96 VLBI stations, 116 SLR stations, and 194 DORIS stations. Polygons drawn in red in the map represent tectonic plate boundaries.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b249bec elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b249bec\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-488e854\" data-id=\"488e854\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2b8b1da elementor-widget elementor-widget-heading\" data-id=\"2b8b1da\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">References<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3d7504b elementor-widget elementor-widget-text-editor\" data-id=\"3d7504b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\tGross, R., Abbondanza, C., Chin, M., Heflin, M., and Parker, J.: JTRF2020: Results and Next Steps, EGU General Assembly 2023, Vienna, Austria, 24-28 Apr 2023, EGU23-2117, <a href=\"https:\/\/doi.org\/10.5194\/egusphere-egu23-2117\" target=\"_blank\" rel=\"noopener\">https:\/\/doi.org\/10.5194\/egusphere-egu23-2117<\/a>, 2023.\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-69a99fd elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"69a99fd\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0c19992\" data-id=\"0c19992\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-628e720 elementor-widget elementor-widget-heading\" data-id=\"628e720\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Citation<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e0c2b51 elementor-widget elementor-widget-text-editor\" data-id=\"e0c2b51\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\tIf you use JTRF2020 in your research, please acknowledge it in your publications by citing:\n\nGross, R., Abbondanza, C., Chin, M., Heflin, M., and Parker, J.: JTRF2020: Results and Next Steps, EGU General Assembly 2023, Vienna, Austria, 24-28 Apr 2023, EGU23-2117,\u00a0<a href=\"https:\/\/doi.org\/10.5194\/egusphere-egu23-2117\" target=\"_blank\" rel=\"noopener\">https:\/\/doi.org\/10.5194\/egusphere-egu23-2117<\/a>, 2023.\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6681022 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6681022\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-ebcdcc3\" data-id=\"ebcdcc3\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-aac6e04 elementor-widget elementor-widget-heading\" data-id=\"aac6e04\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Contact<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9925ce5 elementor-widget elementor-widget-text-editor\" data-id=\"9925ce5\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Richard Gross<br \/>4800 Oak Grove Drive<br \/>Pasadena, CA 91109<br \/>United States of America<br \/>Email: <a href=\"mailto:richard.gross@jpl.nasa.gov\">richard.gross@jpl.nasa.gov<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-be9f127\" data-id=\"be9f127\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>JTRF Solutions JTRF2020 Solution About the JTRF2020 Solution JTRF2020 is the Terrestrial Reference Frame (TRF) the Jet Propulsion Laboratory constructed by combining space geodetic inputs spanning 1979-2020 from Very Long Baseline Interferometry (VLBI), Satellite Laser Ranging (SLR), Global Navigation Satellite System (GNSS) and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) submitted for the determination &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/solutions\/jtrf2020\/\"> <span class=\"screen-reader-text\">JTRF2020 Solution<\/span> Read More \u00bb<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-global-header-display":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"_links":{"self":[{"href":"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-json\/wp\/v2\/pages\/2228"}],"collection":[{"href":"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-json\/wp\/v2\/comments?post=2228"}],"version-history":[{"count":146,"href":"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-json\/wp\/v2\/pages\/2228\/revisions"}],"predecessor-version":[{"id":3903,"href":"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-json\/wp\/v2\/pages\/2228\/revisions\/3903"}],"wp:attachment":[{"href":"https:\/\/www.jpl.nasa.gov\/site\/jsgt\/jtrf\/wp-json\/wp\/v2\/media?parent=2228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}