SAR imagery is distorted geometrically and radiometrically In mountainous and hilly areas,. With Geometric Terrain Correction and Terrain Flattening applications, both the geometric and radiometric terrain effects can be removed from the backscatters, leaving noise being the only factor affecting the land cover classification accuracy. A multi-temporal compositing technique in ESA-SNAP can be applied in this case to reduce the noise level. Also, spatially varying local resolution effects can be compensated if images of both ascending and descending views are combined (not performed in this video but you can try it by yourself). The technique described in this video generates a composite SAR image from a stack of terrain-flattened and geometrically terrain corrected images together with their simulated local illuminated areas.
