{"abstract":"The National Geodetic Survey (NGS) is considering imposing age limits on the observations that will be used in the creation of 2020.00 Reference Epoch Coordinates (RECs), as part of the modernization of the National Spatial Reference System (NSRS). Due to expected uncertainties in the vertical component of the Intra-Frame Velocity Model (IFVM), the age limits cannot be determined until well-structured, data-driven experiments have been conducted. Such experiments are expected to occur during the 2020 reference epoch adjustment projects (geometric, orthometric and gravimetric), which are scheduled for calendar year 2022. Therefore, NGS requests that users take new Global Navigation Satellite System (GNSS) observations on geodetic control marks of interest, especially those marks that have not been surveyed since January 1, 2010, and share them with NGS before December 31, 2021.","action":"Request for information.","agencies":[{"raw_name":"DEPARTMENT OF COMMERCE","name":"Commerce Department","id":54,"url":"https://www.federalregister.gov/agencies/commerce-department","json_url":"https://www.federalregister.gov/api/v1/agencies/54","parent_id":null,"slug":"commerce-department"},{"raw_name":"National Oceanic and Atmospheric Administration","name":"National Oceanic and Atmospheric Administration","id":361,"url":"https://www.federalregister.gov/agencies/national-oceanic-and-atmospheric-administration","json_url":"https://www.federalregister.gov/api/v1/agencies/361","parent_id":54,"slug":"national-oceanic-and-atmospheric-administration"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2020/07/24/2020-16084.html","cfr_references":[],"citation":"85 FR 44865","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"The effective date of this announcement is upon publication of this notice. Submission of GNSS observations on geodetic control marks of interest are requested before December 31, 2021.","disposition_notes":null,"docket_ids":[],"dockets":[],"document_number":"2020-16084","effective_on":"2021-12-31","end_page":44865,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2020/07/24/2020-16084.xml","html_url":"https://www.federalregister.gov/documents/2020/07/24/2020-16084/consideration-of-potential-age-limiting-observations-to-be-used-to-compute-202000-reference-epoch","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2020-16084?publication_date=2020-07-24","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2020-07-24/2020-16084/mods.xml","not_received_for_publication":null,"page_length":1,"page_views":{"count":460,"last_updated":"2026-09-22 16:15:06 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2020-07-24/pdf/2020-16084.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2020-16084.pdf?1595508349","publication_date":"2020-07-24","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2020/07/24/2020-16084.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":44865,"subtype":null,"title":"Consideration of Potential Age-Limiting Observations To Be Used To Compute 2020.00 Reference Epoch Coordinates in the National Spatial Reference System","toc_doc":"Potential Age-Limiting Observations To Be Used To Compute 2020.00 Reference Epoch Coordinates in the National Spatial Reference System","toc_subject":"Request for Information:\n","topics":[],"type":"Notice","volume":85}