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NGS Metadata Library > NGS Imagery >

2017-2023 NOAA East Coast Historical InSAR Data

Data Set (DS)  |  National Geodetic Survey (NGS)
GUID: gov.noaa.nmfs.inport:74380  |  Updated: March 4, 2026  |  Published / External 
Summary
Item Identification
Keywords
Physical Location
Data Set Info
Support Roles
Extents
Spatial Info
Access Info
Distribution Info
Tech Environment
Data Quality
Lineage
Catalog Details

Summary

Short Citation
National Geodetic Survey, 2026: 2017-2023 NOAA East Coast Historical InSAR Data, https://www.fisheries.noaa.gov/inport/item/74380.
Full Citation Examples

Abstract

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.

Purpose

The purpose of this project was to support National Oceanic and Atmospheric Administration (NOAA) for the Coastal Subsidence Monitoring over the US East Coast.

Data Access & Downloads

  • NOAA_SNT_A_VERT_Gulf_50m
    CSV - Comma Separated Values (Text)

    Download 50 meter data in shapefile or csv format.

  • NOAA_SNT_A_VERT_100m
    CSV - Comma Separated Values (Text)

    Download 100 meter data in shapefile or csv format.

  • Reports
    PDF - Adobe Portable Document Format

    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

  • NOAA_SNT_A_VERT_MidAtlantic_50m
    CSV - Comma Separated Values (Text)

    Download 50 meter data in shapefile or csv format.

  • NOAA_SNT_A_VERT_NorthEast_50m
    CSV - Comma Separated Values (Text)

    Download 50 meter data in shapefile or csv format.

  • NOAA_SNT_A_VERT_SouthEast_50m
    CSV - Comma Separated Values (Text)

    Download 50 meter data in shapefile or csv format.

Access Constraints:

None

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.

Controlled Theme Keywords

BEACHES, GEOGRAPHIC INFORMATION SYSTEMS, imageryBaseMapsEarthCover

Child Items

No Child Items for this record.

Contact Information

Point of Contact
National Geodetic Survey (NGS)
ROR: 02f762h70
https://geodesy.noaa.gov/

Metadata Contact
National Geodetic Survey (NGS)
ROR: 02f762h70
https://geodesy.noaa.gov/

Extents

Geographic Area 1

-98.31° W, -66.9° E, 44.57° N, 26.11° S

Data covers coastal areas of the United States from Maine to Texas.

Time Frame 1
2017-01 - 2023-06

Item Identification

Title: 2017-2023 NOAA East Coast Historical InSAR Data
Status: Completed
Creation Date: 2025
Abstract:

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.

Purpose:

The purpose of this project was to support National Oceanic and Atmospheric Administration (NOAA) for the Coastal Subsidence Monitoring over the US East Coast.

Supplemental Information:

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.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES > COASTAL LANDFORMS > BEACHES
Global Change Master Directory (GCMD) Service Keywords
EARTH SCIENCE SERVICES > DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS
ISO 19115 Topic Category
imageryBaseMapsEarthCover

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA

Instrument Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords
SENTINEL-1 C-SAR > SENTINEL-1 C-SAR

Physical Location

Organization: National Geodetic Survey
City: Silver Spring
State/Province: MD

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Mixed: GIS shapefiles and CSV
Maintenance Frequency: None Planned
Data Presentation Form: Other
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.
Data Set Credit: NOAA., Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division

Support Roles

Data Steward

CC ID: 1364043
Date Effective From: 2025
Date Effective To:
Contact (Organization): National Geodetic Survey (NGS)
Address: 1315 East-West Hwy
Silver Spring, MD 20910
ROR: https://ror.org/02f762h70
URL: https://geodesy.noaa.gov/

Distributor

CC ID: 1364042
Date Effective From: 2025
Date Effective To:
Contact (Organization): National Geodetic Survey (NGS)
Address: 1315 East-West Hwy
Silver Spring, MD 20910
ROR: https://ror.org/02f762h70
URL: https://geodesy.noaa.gov/

Metadata Contact

CC ID: 1364044
Date Effective From: 2025
Date Effective To:
Contact (Organization): National Geodetic Survey (NGS)
Address: 1315 East-West Hwy
Silver Spring, MD 20910
ROR: https://ror.org/02f762h70
URL: https://geodesy.noaa.gov/

Point of Contact

CC ID: 1364045
Date Effective From: 2025
Date Effective To:
Contact (Organization): National Geodetic Survey (NGS)
Address: 1315 East-West Hwy
Silver Spring, MD 20910
ROR: https://ror.org/02f762h70
URL: https://geodesy.noaa.gov/

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1364058
W° Bound: -98.31
E° Bound: -66.9
N° Bound: 44.57
S° Bound: 26.11
Description

Data covers coastal areas of the United States from Maine to Texas.

Extent Group 1 / Time Frame 1

CC ID: 1364057
Time Frame Type: Range
Start: 2017-01
End: 2023-06

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Reference Systems

Reference System 1

CC ID: 1364061

Coordinate Reference System
CRS Type: Geographic 3D
EPSG Code: EPSG:4979
EPSG Name: WGS 84
▾ See Full Coordinate Reference System Information

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for downloads
Data Access Constraints:

None
Data 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.

Distribution Information

Distribution 1

CC ID: 1364046
Download URL: https://nsde.ngs.noaa.gov/downloads/NOAA_SNT_A_VERT_Gulf_50m.zip
Distributor: National Geodetic Survey (NGS) (2025 - Present)
File Name: NOAA_SNT_A_VERT_Gulf_50m
Description:

Download 50 meter data in shapefile or csv format.
File Type (Deprecated): Zip
Distribution Format: CSV - Comma Separated Values (Text)
Compression: GTAR

Distribution 2

CC ID: 1370949
Download URL: https://nsde.ngs.noaa.gov/downloads/NOAA_SNT_A_VERT_100m.zip
Distributor: National Geodetic Survey (NGS) (2025 - Present)
File Name: NOAA_SNT_A_VERT_100m
Description:

Download 100 meter data in shapefile or csv format.
Distribution Format: CSV - Comma Separated Values (Text)
Compression: GTAR

Distribution 3

CC ID: 1371155
Download URL: https://nsde.ngs.noaa.gov/downloads/Reports.zip
Distributor: National Geodetic Survey (NGS) (2025 - Present)
File Name: Reports
Description:

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
Distribution Format: PDF - Adobe Portable Document Format
Compression: Zip

Distribution 4

CC ID: 1371249
Download URL: https://nsde.ngs.noaa.gov/downloads/NOAA_SNT_A_VERT_MidAtlantic_50m.zip
Distributor: National Geodetic Survey (NGS) (2025 - Present)
File Name: NOAA_SNT_A_VERT_MidAtlantic_50m
Description:

Download 50 meter data in shapefile or csv format.
Distribution Format: CSV - Comma Separated Values (Text)
Compression: GTAR

Distribution 5

CC ID: 1371250
Download URL: https://nsde.ngs.noaa.gov/downloads/NOAA_SNT_A_VERT_NorthEast_50m.zip
Distributor: National Geodetic Survey (NGS) (2025 - Present)
File Name: NOAA_SNT_A_VERT_NorthEast_50m
Description:

Download 50 meter data in shapefile or csv format.
Distribution Format: CSV - Comma Separated Values (Text)
Compression: GTAR

Distribution 6

CC ID: 1371251
Download URL: https://nsde.ngs.noaa.gov/downloads/NOAA_SNT_A_VERT_SouthEast_50m.zip
Distributor: National Geodetic Survey (NGS) (2025 - Present)
File Name: NOAA_SNT_A_VERT_SouthEast_50m
Description:

Download 50 meter data in shapefile or csv format.
Distribution Format: CSV - Comma Separated Values (Text)
Compression: GTAR

Technical Environment

Description:

OS Independent

Data Quality

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.

Lineage

Sources

Processing

CC ID: 1364054
Contact Role Type: Originator
Contact Type: Organization
Contact Name: Tre Altamira

Process Steps

Process Step 1

CC ID: 1364055
Description:

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.
Process Contact: National Geodetic Survey (NGS)
ROR: https://ror.org/02f762h70

Process Step 2

CC ID: 1364063
Description:

The acquired SNT imagery has been processed using the SqueeSAR technique, which is the advanced multiimage 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.
Process Contact: National Geodetic Survey (NGS)
ROR: https://ror.org/02f762h70

Process Step 3

CC ID: 1364062
Description:

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.
Process Contact: National Geodetic Survey (NGS)
ROR: https://ror.org/02f762h70

Catalog Details

Catalog Item ID: 74380
GUID: gov.noaa.nmfs.inport:74380
Metadata Record Created By: Maryellen Sault
Metadata Record Created: 2025-01-22 16:56+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2026-03-04 19:17+0000
Metadata Record Published: 2025-02-18
Owner Org: NGS
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-04-01
Metadata Review Frequency: 3 Years
Metadata Next Review Date: 2025-04-01