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

CSLC-S1 Product Specification Document

The CSLC-S1 Product Specification 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.

CSLC-S1-STATIC Product Specification Document

The CSLC-S1-Static Product Specification document describes the specifications of the OPERA Level-2 Radiometric Terrain-Corrected SAR Backscatter from Sentinel-1 (CSLC-S1) Static Layers (CSLC-S1-STATIC) product. It is distributed separately from the CSLC-S1 products, and it is only produced once (or a limited amount of times) for CSLC-S1 products characterized by the same burst identification string, i.e., for all the Sentinel-1 bursts covering the same geographical area on the ground. The CSLC-S1-STATIC contains both data raster layers (e.g., geocoded geometry layers) and product metadata.

CSLC-S1 Product Calibration/Validation (CalVal) Database

OPERA_CSLC_Calval_Database.zip: This file contains the calibration/validation (CalVal) database for the OPERA CSLC-S1 product. The CalVal database is a zip file that contains:

• • Ancillary data products needed for validation, tables with CSLC-S1 product metadata (including links to the CSLC-S1 CalVal collections and static layers)
  • Validation reports detailing the results of the validation process,
  • A CalVal database reference document that details the contents of the database

This database is designed to be read and used by the OPERA CSLC CalVal GitHub repository to reproduce the validation process and results. Products can be downloaded by request.

CSLC_S1 Bursts

The burst database is an SQLite file generated by the OPERA ADT containing relevant information on the bursts acquired worldwide throughout the duration of the S1-A/B mission. Since the S1-A/B sensors perform systematic burst acquisitions, the burst geographical location on the ground is almost identical at each pass. Therefore, each burst can be identified by a unique alphanumeric string called a burst identification number or burst ID. The burst database includes the burst ID for all the bursts generated throughout the S1-A/B mission; each burst ID follows the same convention adopted by ESA in the generation of their burst map. The burst database includes other relevant processing information, such as the relative orbit number, the corner coordinates, and the projection system of the geographical grid, which generates each CSLC-S1 product.

Using the burst database while producing CSLC-S1 products guarantees that a time series of CSLC-S1 products characterized by the same burst ID shares the same geographical grid, i.e., they can be differenced pixel-wise. These products can be downloaded directly from an S3 bucket here.

The burst database is generated by the OPERA ADT and is available from the GitHub repository. The script inputs the ESA burst map (IW mode, in SpatiaLite format). The ESA burst map can be downloaded here.

Interactive Guides

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