gov.noaa.nmfs.inport:74380 eng UTF8 dataset Mixed: GIS shapefiles and CSV National Geodetic Survey resourceProvider National Geodetic Survey 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ WWW:LINK-1.0-http--link National Geodetic Survey Website Website listed for National Geodetic Survey information pointOfContact 2026-03-04T19:17:17 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) EPSG::4979 2017-2023 NOAA East Coast Historical InSAR Data 2025 creation publication NOAA/NMFS/EDM 74380 https://www.fisheries.noaa.gov/inport/item/74380 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information Dewberry contracted TRE Altamira Inc (TREA) for a historical InSAR analysis of ground displacement over the East Coast of the United States of America (U.S.A.), for the National Oceanic and Atmospheric Administration (NOAA). The area of interest (AOI) includes the major coastal cities and coastal plains and covers over 500,000 km2 (193,000 mi2). TREAs proprietary SqueeSAR algorithm was used to process Sentinel-1 (SNT) satellite imagery acquired between January 2017 and July 2023 and the results were calibrated using the NOAA's CORS GNSS (Global Navigation Satellite System) network for the generation of vertical InSAR (SAR Interferometry) measurements. The purpose of this project was to support National Oceanic and Atmospheric Administration (NOAA) for the Coastal Subsidence Monitoring over the US East Coast. NOAA., Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division completed National Geodetic Survey 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ WWW:LINK-1.0-http--link National Geodetic Survey Website Website listed for National Geodetic Survey information pointOfContact National Geodetic Survey 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ WWW:LINK-1.0-http--link National Geodetic Survey Website Website listed for National Geodetic Survey information custodian notPlanned EARTH SCIENCE > LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES > COASTAL LANDFORMS > BEACHES theme Global Change Master Directory (GCMD) Science Keywords 17.0 EARTH SCIENCE SERVICES > DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS service Global Change Master Directory (GCMD) Service Keywords 17.0 CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA place Global Change Master Directory (GCMD) Location Keywords 20.8 SENTINEL-1 C-SAR > SENTINEL-1 C-SAR instrument Global Change Master Directory (GCMD) Instrument Keywords 17.2 DOC/NOAA/NOS/NGS > National Geodetic Survey, National Ocean Service, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2017-04-24 publication 8.5 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian NGS Imagery project InPort otherRestrictions Cite As: National Geodetic Survey, [Date of Access]: 2017-2023 NOAA East Coast Historical InSAR Data [Data Date Range], https://www.fisheries.noaa.gov/inport/item/74380. NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose. otherRestrictions Access Constraints: None otherRestrictions Use Constraints: Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. otherRestrictions Distribution Liability: Users must assume responsibility to determine the usability of these data. These data were obtained for use by NGS during the course of its development of potential final products to fulfill its statutory mission. Although NGS is making this data available to others who may find it of value, NGS does not warrant, endorse, or recommend the use of it for any given purpose. Any conclusions drawn from the analysis of this data are not the responsibility of NOAA, the Office for Coastal Management or its partners. unclassified NOAA Data Management Plan (DMP) NOAA/NMFS/EDM 74380 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nos/ngs/dmp/pdf/74380.pdf WWW:LINK-1.0-http--link NOAA Data Management Plan (DMP) NOAA Data Management Plan for this record on InPort. information crossReference vector eng; US imageryBaseMapsEarthCover OS Independent -98.31 -66.9 26.11 44.57 Data covers coastal areas of the United States from Maine to Texas. | Currentness: Ground Condition 2017-01-01 2023-06-01 The Vertical InSAR data is provided in 50x50 m and 100x100 m resolution versions. It is provided in csv and shapefile (.shp) format, metric units and WGS84 coordinate system. It is divided into multiple files below a 2G size, to facilitate the download and analysis on GIS platforms. CSV - Comma Separated Values (Text) GTAR PDF - Adobe Portable Document Format Zip CSV - Comma Separated Values (Text) GTAR CSV - Comma Separated Values (Text) GTAR CSV - Comma Separated Values (Text) GTAR CSV - Comma Separated Values (Text) GTAR National Geodetic Survey 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ WWW:LINK-1.0-http--link National Geodetic Survey Website Website listed for National Geodetic Survey information distributor https://nsde.ngs.noaa.gov/downloads/NOAA_SNT_A_VERT_Gulf_50m.zip WWW:LINK-1.0-http--link NOAA_SNT_A_VERT_Gulf_50m Download 50 meter data in shapefile or csv format. download https://nsde.ngs.noaa.gov/downloads/Reports.zip WWW:LINK-1.0-http--link Reports Zip file containing NOAA East Coast InSAR Analysis - Calibration Report.pdf, NOAA East Coast InSAR Analysis - Historical Data Report.pdf and NOAA East Coast InSAR Analysis - Imagery Procurement Report.pdf download https://nsde.ngs.noaa.gov/downloads/NOAA_SNT_A_VERT_MidAtlantic_50m.zip WWW:LINK-1.0-http--link NOAA_SNT_A_VERT_MidAtlantic_50m Download 50 meter data in shapefile or csv format. download https://nsde.ngs.noaa.gov/downloads/NOAA_SNT_A_VERT_NorthEast_50m.zip WWW:LINK-1.0-http--link NOAA_SNT_A_VERT_NorthEast_50m Download 50 meter data in shapefile or csv format. download https://nsde.ngs.noaa.gov/downloads/NOAA_SNT_A_VERT_SouthEast_50m.zip WWW:LINK-1.0-http--link NOAA_SNT_A_VERT_SouthEast_50m Download 50 meter data in shapefile or csv format. download https://nsde.ngs.noaa.gov/downloads/NOAA_SNT_A_VERT_100m.zip WWW:LINK-1.0-http--link NOAA_SNT_A_VERT_100m Download 100 meter data in shapefile or csv format. download dataset Vertical Positional Accuracy The calibrated InSAR measurements covering the full processed area were then compared to the 350 calibration GNSS measurements (projected to the same LOS direction) for the evaluation of the results. The difference between the displacement rate of the InSAR MPs located within a 100-m radius from each GNSS station was calculated with respect to the GNSS displacement rate, weighted on the period of each GNSS time series. The comparison highlights an average rate difference of 0.1 mm/yr and a standard deviation of +/-0.3 mm/yr, confirming the good results of the calibration procedure. It is noted that the high correspondence between the two sets of measurements does not provide an evaluation of the absolute accuracy of the Vertical InSAR results, because this depends on the initial accuracy of the input GNSS data. As recalled in Section 4.1, GNSS measurements have vertical accuracy of 1-2 cm and this should be considered the absolute accuracy of the calibrated InSAR results, even if the initial InSAR relative precision, referred to local reference points, is in the order of a few millimeter. Please see report for more details on the data accuracy. Over 3,500 Synthetic Aperture radar (SAR) images, acquired by the European Space Agency (ESA) Sentinel-1 (SNT-1) satellite over the East Coast of the United States between January 2017 and July 2023 from an ascending orbit, were downloaded for the current study. These Synthetic Aperture Radar (SAR) satellites acquired data along swathes (known as tracks), in the C-band wavelength (5.6 cm, 2.2 inches) and with a 5 x 20 meter (65 x 15 ft) ground resolution. National Geodetic Survey processor The acquired SNT imagery has been processed using the SqueeSAR technique, which is the advanced multi?image InSAR algorithm patented by TREA that provides high precision measurements of ground displacement in the form of a point cloud. By analyzing a stack of SAR images acquired from the same track over an area, the SqueeSAR algorithm identifies and measures the movement of radar reflectors on the ground surface that remain visible and coherent throughout the period of the analysis. The over 3,500 images acquired along the 17 different tracks over the area of interest were processed in approximately 160 separate processing sites, and the results were combined using TREA's wide area processing chain. The analysis of the SNT imagery produced 1-D LOS InSAR measurements (i.e. away or toward the satellite along the satellite LOS) for a total of over 150,000,000 measurement points within the AOI. Due to the high variability of land cover within the area of interest, the MP density varies within the area and the lowest density was obtained over areas affected by strong decorrelation disturbances, such as swamps, areas with extensive snow coverage or dense vegetation. It is finally noted that InSAR natively provides differential displacement measurements, referring to local reference points. The absolute calibration of the LOS measurements for this was performed using the NOAA CORS network. National Geodetic Survey processor The absolute calibration of the InSAR measurements, which are natively 1-D (LOS) and referred to local reference points, was performed using NOAA's CORS GNSS network. The analysis of the results highlighted a high degree of correspondence between the Vertical GNSS and Vertical InSAR data following the calibration procedure. The average displacement rate difference calculated for the 206 GNSS stations located within the area of interest is -0.1 mm/yr with a standard deviation of +/-0.3 mm/yr. Please see the report for more detailed information on calibration methodology and results. National Geodetic Survey processor Processing Tre Altamira originator