Multilooking tool job

[ABraun]

Please have a look at these topics:

Multilooking necessary when geocoding?

Hello, I am fairly new to the SAR processing and I am trying to learn the basics through the ESA Sentinel Toolbox tutorials, which are a valuable resource. In the very first tutorial “SAR Basic Tutorial”, I don’t understand the role of the Multilooking process specially when compared with Geocoding. According to the tutorial, the “Multilooking can be an optional step, since it is not necessary when terrain correcting an image”. But in the Terrain correction step of the tutorial, the input ima…

GRDH vs. Multi-Look and Pixel Spacing vs. Resolution

yes, GRD is already multi-looked. It is not a mandatory step, because before you can use SAR data in a GIS you have to geocode them which is done in SNAP during the Range Doppler Terrain Correction which also applies a resampling, resulting in square pixels anyway. Multi-looking is good to make SLC data easier to handle but it makes little sense for GRD data unless you want to systematically alter the spatial resolution at consistent intervals.

GTC (Geocoded terrain corrected) data

it means that its already ground-range corrected. Unlike SLC data the pixels’ areas are already of same size. Astrium has made nice graphics for this case. They refer to TerraSAR-X but the principle is the same for most SAR satellites: Slant Range Complex (SLC/SSC/L.1.1) [image] Data is neither multi-looked nor projected Ground Range Detected (GRD/MGD/L1.5) [image] Data is multi-looked but not projected Geocoded Ellipsoid Corrected (GEC/L2.0) [image] Data is projected but topographic d…