NISAR Beta Geocoded Pixel Offsets (Version 1)

The NASA-ISRO Synthetic Aperture Radar (NISAR) Geocoded Pixel Offsets (GOFF) product is a Level 2 product derived from the Range Doppler Pixel Offsets (ROFF) product by geocoding the pixel offset layers and its associated data layers (i.e., SNR) on a geographical grid at 80 m posting. Geocoding uses the orbit of the reference Range Doppler Single Look Complex (RSLC) product and a Digital Elevation Model (DEM) to project the data onto a pre-defined Universal Transverse Mercator (UTM) or Polar stereographic projection system map grid. The geocoding algorithm uses a bilinear interpolation for interpolating data layers with floating-point data types.

The GOFF product contains a collection of data layers representing the pixel offset shifts between a pair of coarsely coregistered RSLC granules. The spacing, the window size, and the search radius used to generate the pixel offset layers in the range-Doppler geometry are organized by range bandwidth and area of observation. Pixel offset layers are distributed without performing any conventional post-processing operation, i.e., layers might contain offset outliers and are not low pass filtered to reduce noise in the data.

The products in this collection are considered Beta products and are intended to enable users to gain familiarity with the parameters and the data formats. Beta products are not intended for use in scientific research.