Description

The Observational Products for End-Users from Remote Sensing Analysis (OPERA) Radiometric Terrain Corrected (RTC) SAR Backscatter from Sentinel-1 (S1) validated product consists of radar backscatter normalized with respect to the topography. The product maps signals related to the physical properties of ground scattering objects, such as surface roughness and soil moisture and/or vegetation. The OPERA RTC-S1 product is derived from Copernicus Sentinel-1 Interferometric Wide (IW) Single Look Complex (SLC) data with a near global scope and temporal sampling coincident with the availability of S1 SLC data. Each OPERA RTC-S1 product corresponds to a single S1 burst projected onto a pre-defined UTM/Polar stereographic map projection system map grid with a 30-meter spacing. 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 OPERA RTC-S1 product is normalized to the backscatter coefficient gamma-naught, ɣ0, obtained from the original radar brightness beta-naught, β0, through radiometric terrain correction. The RTC-S1 product is distributed as cloud optimized GeoTIFFs with one GeoTIFF file per processed polarization. The RTC-S1 product metadata is provided in the Hierarchical Data Format version 5 (HDF5) format. The OPERA RTC-S1 product contains modified Copernicus Sentinel data (2022-2025). Due to the S1 mission’s narrow orbital tube, radar-geometry layers such as incidence angle, local incidence angle, number of looks, and RTC Area Normalization Factor (ANF) vary slightly over time for each position on the ground, and therefore are considered static. 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. The static layers are available in the associated OPERA Radiometric Terrain Corrected SAR Backscatter from Sentinel-1 Static Layers validated product (Version 1) dataset.

Product Summary

Platforms

SENTINEL-1A,

SENTINEL-1B

Instruments

C-SAR

Spatial Extent

N: 90 S: -90 E: 180 W: -180

Coordinate System

CARTESIAN

Granule Spatial Representation

CARTESIAN

Temporal Extent

2020-12-31 to Present

Data Partner

Alaska Satellite Facility (ASF)

Observational Products for End-Users from Remote Sensing Analysis, Jet Propulsion Laboratory, NASA (NASA/JPL/OPERA)

Concept ID

C2777436413-ASF

Data State

ACTIVE

Processing Level

2

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use Policy.

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NASA/JPL/OPERA. (2023). OPERA Radiometric Terrain Corrected SAR Backscatter from Sentinel-1 validated product (Version 1) [Data set]. NASA Alaska Satellite Facility Distributed Active Archive Center. https://doi.org/10.5067/SNWG/OPERA_L2_RTC-S1_V1

Data Center Citation

OPERA. OPERA Radiometric Terrain Corrected SAR Backscatter from Sentinel-1 validated product (Version 1). NASA Alaska Satellite Facility Distributed Active Archive Center.

OPERA Radiometric Terrain Corrected SAR Backscatter from Sentinel-1 validated product (Version 1)

Data at a Glance

Description

Product Summary

Citation

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Learning Resources