Data Overview

NISAR Sample Data Product Suite

Range-Doppler Single Look Complex (RSLC) product and its geocoded version, i.e., Geocoded Single Look Complex (GSLC) simulated from UAVSAR observa-tions.

The project team has created a set of sample products using JAXA ALOS-1 PALSAR data as a surrogate for NISAR. The sample covers the full suite of planned products, from Level 0 raw data (in NISAR format) to Level 1 and Level 2. These data cover a smaller area than a NISAR frame, but the formate and metadata content is fully compatible with the data NISAR will produce after entering the science phase, allowing users to prepare their analysis tools well in advance of operations. In addition, a suite of products based on full-frame simulated radar data will be made available.

The data and their description can be accessed here. (link)

NISAR Sample Data Products Derived From UAVSAR

A map of North America, up to Greenland, showing UAVSAR flight paths
An overview of UAVSAR's flight paths, and the NISAR simulated data that can be accessed in the database.

We also have created a set of prototype data products from the UAVSAR airborne L-band radar. The data have been altered to emulate NISAR data by changing the bandwidth and noise level. By comparing these to the full resolution, low noise UAVSAR data sets, users can better understand the nature of the NISAR data.

A guide for downloading data, processing notes, product descriptions, naming conventions, and known issues can be found here (link). Note: these products have incomplete metadata relative to the current product suites (above), but should have all the essential elements for interpreting and analyzing them.

The database containing 440 products from 73 flight lines can be directly accessed by going here (link).

Other Products in NISAR Format

an example of a Sentinel-1 Interferogram

Sentinel-1 Interferogram (BETA) products are prototype Level 2 NISAR-Format interferometric products (link) produced using the ARIA Science Data System. The creation, discovery, and distribution of these products can help users with developing cloud-based processing and data management solutions. As such, these prototype products are not part of the ASF long-term archive and may become unavailable at any time as new SAR interferometric processing and delivery methods are explored.

More information on the Sentinel-1 Interferograms can be found here (link)

Other Data Sets of Interest

This dataset is the first-of-its-kind spatial representation of multi-seasonal, global SAR repeat-pass interferometric coherence and backscatter signatures. Global coverage comprises all land masses and ice sheets from 82 degrees northern to 78 degrees southern latitude. The dataset is derived from high-resolution multi-temporal repeat-pass interferometric processing of about 205,000 Sentinel-1 Single-Look-Complex (SLC) data acquired in Interferometric Wide-Swath mode (Sentinel-1 IW mode) from 1-Dec-2019 to 30-Nov-2020.

More information on the ASF Sentinel-1 Backscatter dataset can be found here (link).