Karst topography in Guilin

Sentinel-1 CSAR IW acquired on 10 February 2015 at 22:32:47 UTC
Sentinel-1 CSAR IW acquired on 05 March 2017 at 10:42:19 UTC
Sentinel-2 MSI acquired on 29 November 2018 at 03:10:51 UTC
Author(s): Sentinel Vision team, VisioTerra, France - svp@visioterra.fr
Keyword(s): Land, relief, urban, karst topography, river, China.
Fig. 1 - S2 (29.11.2018) - 12,11,4 colour composite - Guilin city, South of China
Fig. 2 - S2 (29.11.2018) - 11,8,2 colour composite - It is famed for its steep karst topography.
Most of these green limestone hills are higher than they are large, they are often interspersed by caves.
Fig. 3 - S1 (05.03.2017) - vv,vh,vv colour composite - SRTM-based pixel-scale on-the-fly orthorectification on Guilin.
Ridgelines & talwegs remain still between optical images, ascending & descending radar images. Illuminated and shadowed sides still differ between acquisitions using the sunlight, east or west-looking radar beams as a source. As a result, images superimpose but bright and dark facets should vary.
Fig. 4 - 11,8,2 colour composite - Karst topology south east of Guilin along the Li river.
Fig. 5 - S1 (10.02.2015) - vv,vh,vv colour composite - The addition of SRTM DEM shows finer relief on land using the 3D view.