NISAR Provisional Range Doppler Unwrapped Interferogram Product (Version 1)

If a Range Doppler Pixel Offsets (ROFF) product is available for the processed frame, the sub-pixel offset layers included in RUNW are obtained by optimally blending the multi resolution offset layers included in ROFF. Look-up tables for parallel and perpendicular baseline components are also included. The RUNW product also contains an ionospheric phase screen layer and a layer quantifying its uncertainty.

Where possible, the ionospheric phase screen is estimated from the two spectral bands frequency A and frequency B. In the case of mode transitions where the continuity of spectral bands is impacted, a split spectrum ionospheric phase estimate and an estimate of its standard deviation are derived from the main imaging band frequency A. The estimated ionospheric phase screen is included in the product but not applied to the data layers within RUNW by default.

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.