NISAR Provisional Range Doppler Wrapped Interferogram Product (Version 1)

The interferometric workflow producing RIFG products coregisters a pair of RSLC products using a Digital Elevation Model and the best available orbit ephemeris. This coregistration is refined using incoherent cross-correlation on the pair of coarsely coregistered RSLCs. The RIFG product includes the slant range and along-track sub-pixel offsets obtained from incoherent cross-correlation and used to generate the complex wrapped interferogram.

If a Range Doppler Pixel Offsets (ROFF) product is available for the processed frame, the sub-pixel offset layers included in RIFG are obtained by optimally blending the multi-resolution offset layers included in ROFF. The products in this collection are considered Provisional products and are intended to facilitate data exploration and process studies that do not require rigorous validation. These data are partially validated, and improvements are continuing; quality may not be optimal since validation and quality assurance are ongoing.