I am new-bee in ArcGIS. Currently I have a task to open a bundled files like:
some_map.tfw 1 kb
some_map.tif 133,666 kb
some_map.tif.aux.xml 2 kb
some_map.tif.ovr 45,645 kb
here, the tfw file seems to be a world file,
and aux.xml is an auxiliary file, help ArcGIS to understand the total files.
tif is the base image file, and ...
The DEM will have a nodata value that means there is a void (no information there). Load the .hgt file into QGIS / Arc, look at the layer properties, to find out what it is. Visually, you could:
Make the layer completely black.
Set the nodata value to be transparent (should be automatic).
Look for voids.
Programmatically, you could
load the raster to an ...