Alaska Satellite Facility - Distributed Active Archive Center

OPERA

Observational Products for End-Users from Remote Sensing Analysis Image showing earth with grid and OPERA logo

Observational Products for End-Users from Remote Sensing Analysis (OPERA)

 

The OPERA project at the Jet Propulsion Laboratory was created to address high-priority requests from the Earth science research community for products generated from space-borne synthetic aperture radar (SAR) and optical sensors. Three products were identified:

  • Near-global Dynamic Surface Water Extent products
  • Near-global Surface Disturbance products
  • North America Surface Displacement products

“Near-global” corresponds to all landmasses excluding Antarctica. “North America” corresponds to the United States and U.S. Territories, Canada within 200 km of the U.S. border, and all mainland countries from the southern U.S. border up to and including Panama.

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OPERA Products Overview

sample OPERA RTC image

 

Level-3 SAR and Optical data products

Near-global Dynamic Surface Water eXtent (DSWx) product suite

  • Utilizes Sentinel-1 SAR and Harmonized Landsat-8/Sentinel-2 optical data
  • Products available through the Physical Oceanography Distributed Active Archive Center (PO.DAAC)

Near-global Surface Disturbance (DIST) product suite

  • Utilizes Harmonized Landsat-8 & -9/Sentinel-2 optical data
  • Products available through the Land Processes Distributed Active Archive Center (LP DAAC)

North America Land Surface Displacement (DISP) product suite

  • Utilizes Sentinel-1 Interferometric SAR (InSAR) time-series data
  • Products will be available through the Alaska Satellite Facility Distributed Active Archive Center (ASF DAAC)

 

Level-2 SAR data products

 

  • Near-global land surface Radiometric Terrain Corrected (RTC) SAR backscatter product
  • Near-global land surface Radiometric Terrain Corrected (RTC) SAR backscatter static layers product
  • North America Coregistered Single-Look Complex (CSLC) product suite

The ASF DAAC distributes Level-2 OPERA SAR data products.

OPERA SAR-based Product Overview

PropertyRTC-S1 ProductRTC-S1 Static Layers ProductCSLC-S1 ProductDISP-S1 Product
NameLevel-2 Radiometric Terrain-Corrected (RTC-S1)Level-2 Radiometric Terrain-Corrected static layersLevel-2 Coregistered Single-Look Complex (CSLC-S1)Level-3 Displacement Product (DISP-S1)
DescriptionConsists of Sentinel-1 radar backscatter data normalized with respect to the topography. It is a Level-2 product that is projected onto a pre-defined UTM/Polar stereographic map projection system. The Copernicus Global 30 m (GLO-30) Digital Elevation Model (DEM) is the reference DEM used to correct for the impacts of topography and to geocode the product. The product is provided in a GeoTIFF file format.These static layers are provided separately from the OPERA RTC-S1 product, as they are produced only once or a limited number of times, to account for changes in the DEM, in the S1 orbit, or in the static-layers generation algorithm. Static layers will also be provided as single-band COG files, with map grid matching RTC-S1 products with the same burst ID.Consists of SLC images that are precisely aligned or “coregistered” to a pre-defined UTM/Polar stereographic map projection system. The CSLC images contain both the amplitude and phase information of the complex radar return. The Level-2 CSLC product is derived from Sentinel-1 data and is provided in HDF5 format. The CSLC product also serves as the basis for the OPERA Displacement (DISP) product.TBD
Temporal coverage2014-present2014-present2014-present2014-present
Spatial coverageNear Global (all land masses excluding Antarctica)Near Global (all land masses excluding Antarctica)USA and U.S Territories within 200 km of the U.S. border, Canada, and all mainland countries from the southern U.S. border down to and including Panama)USA and U.S Territories within 200 km of the U.S. border, Canada, and all mainland countries from the southern U.S. border down to and including Panama)
Version1.01.01.0TBD
DOIL2_RTC-S1 DOIL2_RTC-S1-STATIC DOIL2_CSLC-S1 DOITBD
Download informationhttps://asf.alaska.edu/how-to/data-basics/asf-services-data-discovery/https://asf.alaska.edu/how-to/data-basics/asf-services-data-discovery/https://asf.alaska.edu/how-to/data-basics/asf-services-data-discovery/https://asf.alaska.edu/how-to/data-basics/asf-services-data-discovery/
File formatCloud Optimized GeoTIFF (COG)Cloud Optimized GeoTIFF (COG)HDF5HDF5
ProviderOPERA Data SystemOPERA Data SystemOPERA Data SystemOPERA Data System
Date publishedTBDTBDTBDTBD
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User Guides/Technical Documentation

CSLC-S1: Product Specification Document, Sample Product, and Interactive Guides
CSLC-S1 Product Specification Document

This document describes the specifications of the OPERA Level-2 Coregistered Single-Look Complex (CSLC) product that uses Sentinel-1 SLC products as the primary image-based input. Accordingly, this data product is referred to by the short name CSLC-S1.

https://d2pn8kiwq2w21t.cloudfront.net/documents/ProductSpec_CSLC_URS314199.pdf

 

CSLC-S1 Sample Beta Product

The Los Angeles Basin in Southern California is a sedimentary basin characterized by significant structural relief and complex faulting.

Use this link to download a CSLC-S1 sample beta product derived from a Sentinel-1A acquisition on May 1, 2022:

https://d2pn8kiwq2w21t.cloudfront.net/documents/OPERA_L2_CSLC_S1A_IW_064_135518_IW1_VV_20220501T015035_1.0_20230206T174400.h5

 

Interactive Guides
  • Visualization Guide —  Illustrates how users can manipulate products in the open-source QGIS software

https://d2pn8kiwq2w21t.cloudfront.net/documents/CSLC_visualization_guide.pdf

 

  • Jupyter Notebook Tutorials — Introductory guides written in a Jupyter Notebook environment that showcases select applications
      • Tutorial 1: How to generate interferograms (without having to download OPERA CSLC-S1 products locally). This example is for the Ridgecrest Earthquake, California, USA, from July 2019.

https://github.com/OPERA-Cal-Val/OPERA_Applications/tree/main/CSLC/Discover

RTC-S1: Product Specification Document, Static Product Specification Document, Sample Product, and Interactive Guides
RTC-S1 Product Specification Document

This document describes the specifications of the OPERA Level-2 Radiometric Terrain-Corrected (RTC) product that uses Sentinel-1 SLC data as the primary image-based input.

https://d2pn8kiwq2w21t.cloudfront.net/documents/ProductSpec_RTC-S1.pdf

 

RTC-S1-STATIC Product Specification Document

This document describes the specifications of the OPERA Level-2 Radiometric Terrain-Corrected SAR Backscatter from Sentinel-1 (RTC-S1) Static Layers (RTC-S1-STATIC) product. The RTC-S1-STATIC product provides radar geometry layers, such as local incidence angle or incidence angle, that describe the Sentinel-1 acquisition geometry associated with the OPERA RTC-S1 products with the same burst ID.

https://d2pn8kiwq2w21t.cloudfront.net/documents/ProductSpec_RTC-S1-STATIC.pdf

 

RTC-S1 Sample Beta Product

The Los Angeles Basin in Southern California is a sedimentary basin characterized by significant structural relief and diverse urban and agricultural vegetation, which historically has been affected by regular flash flooding and fire events. Use this link to download an RTC-S1 sample beta product derived from a Sentinel-1B acquisition on September 26, 2020, spanning part of this region:

https://d2pn8kiwq2w21t.cloudfront.net/documents/OPERA_L2_RTC-S1_T071-151230-IW2_20200926T135208Z_20230818T163455Z_S1B_30_v0.4._vFdPSQt.zip

 

Interactive Guides
  • Jupyter Notebook Tutorials — Introductory guides written in a Jupyter Notebook environment that showcases select applications
      • Tutorial 1: How to mosaic and visualize RTC-S1 images

https://github.com/OPERA-Cal-Val/OPERA_Applications/blob/main/RTC/notebooks/RTC_notebook.ipynb

Products

Level-2 Radiometric Terrain-Corrected (RTC-S1) from Sentinel-1

 

The Radiometric Terrain Corrected (RTC-S1) SAR product consists of Sentinel-1 radar backscatter data normalized with respect to the topography. It is a Level-2 product that is projected onto a pre-defined UTM/Polar stereographic map projection system. The Copernicus Global 30 m (GLO-30) Digital Elevation Model (DEM) is the reference DEM used to correct for the impacts of topography and to geocode the product. The product is provided in a GeoTIFF file format.

PropertyValue
Product Short NameL2_RTC-S1
Satellite PlatformSentinel-1A or Sentinel-1B
Sensor (center frequency)C-Band SAR (5.405 GHz)
Temporal Coverage2014-present
Repeat Period6-12 days
Acquisition ModeIW
Data SourceSentinel-1 SLC burst
Spatial CoverageNear Global (all land masses excluding Antarctica)
Data ProjectionUTM/ Polar stereographic map grid
DEMCopernicus GLO-30 or GLO-90
Spatial Resolution30-meter
Product FormatCloud Optimized GeoTIFF (COG)
DOIhttps://doi.org/10.5067/SNWG/OPERA_L2_RTC-S1_V1
Data ProviderOPERA Data System
Data DistributorASF DAAC


 

Level-2 Radiometric Terrain-Corrected SAR from Sentinel-1 Static Layers (RTC-S1-STATIC)

 

The RTC-S1-STATIC product is a Level 2 product that contains static radar geometry layers associated with the RTC-S1 product.

PropertyValue
Product Short NameRTC-S1-STATIC
Satellite PlatformSentinel-1A or Sentinel-1B
Sensor (center frequency)C-Band SAR (5.405 GHz)
Temporal Coverage2014-present
Repeat Period6-12 days
Acquisition ModeIW
Data SourceSentinel-1 SLC burst
Spatial CoverageNear Global (all land masses excluding Antarctica)
Data ProjectionUTM/ Polar stereographic map grid
DEMCopernicus GLO-30 or GLO-90
Spatial Resolution30-meter
Product FormatCloud Optimized GeoTIFF (COG)
LayersIncidence angle
Local-incidence angel
No. of looks
Mask layer
RTC ANF gamma0 to beta0
RTC ANF gamma0 to sigma0
DOIhttps://doi.org/10.5067/SNWG/OPERA_L2_RTC-S1-STATIC_V1
Data ProviderOPERA Data System
Data DistributorASF DAAC


 

Level-2 Coregistered Single-Look Complex (CSLC-S1) from Sentinel-1

 

The Coregistered Single-Look Complex (CSLC) product consists of SLC images that are precisely aligned or “coregistered” to a pre-defined UTM/Polar stereographic map projection system. The CSLC images contain both the amplitude and phase information of the complex radar return. The Level-2 CSLC product is derived from Sentinel-1 data and is provided in HDF5 format. The CSLC product also serves as the basis for the OPERA Displacement (DISP) product.

PropertyValue
Product Short NameL2_CSLC-S1
Satellite PlatformSentinel-1A or Sentinel-1B
Sensor (center frequency)C-Band SAR (5.405 GHz)
Temporal Coverage2014-present
Repeat Period6-12 days
Acquisition ModeIW
Data SourceSentinel-1 SLC burst
Spatial CoverageUSA and U.S Territories within 200 km of the U.S. border, Canada, and all mainland countries from the southern U.S. border down to and including Panama)
Data ProjectionUTM/WGS84 map grid
Spatial Resolution~15m × 5m (azimuth x range)
Product FormatHDF5
DOIhttps://doi.org/10.5067/SNWG/OPERA_L2_CSLC-S1_V1
Data ProviderOPERA Data System
Data DistributorASF DAAC

Citation Information

ProductFormatExample
RTC-S1OPERA. 2023. OPERA Level 2 Radiometric Terrain Corrected from Sentinel-1 Provisional Product (Version 1). Fairbanks, Alaska USA. NASA Alaska Satellite Facility Distributed Active Archive Center. doi: https://doi.org/10.5067/SNWG/OPERA_L2_RTC-S1_V1. [Date Accessed].
RTC-S1 Static LayersOPERA. 2023. OPERA Level 2 Radiometric Terrain Corrected from Sentinel-1 Provisional Product (Version 1). Fairbanks, Alaska USA. NASA Alaska Satellite Facility Distributed Active Archive Center. doi: https://doi.org/10.5067/SNWG/OPERA_L2_RTC-S1_V1. [Date Accessed].Needs to be edited
CSLC-S1OPERA. 2023. OPERA Level 2 Radiometric Terrain Corrected from Sentinel-1 Provisional Product (Version 1). Fairbanks, Alaska USA. NASA Alaska Satellite Facility Distributed Active Archive Center. doi: https://doi.org/10.5067/SNWG/OPERA_L2_RTC-S1_V1. [Date Accessed].Needs to be edited

Discover OPERA products

The OPERA L-3 North America Land Surface Displacement product and L-2 CSLC and RTC products can be accessed at ASF DAAC:

Data Discovery ToolLink
ASF Vertex Data SearchVertex
Python Search Moduleasf_search
ASF Search APIASF Search API
NASA Earthdata SearchEarthdata Search

Learn more about ASF Data Discovery Services