I'm trying to classify some area in northern Mongolia using Landsat 8 satellite images from 2013. Since the recordings were made in winter, the sun is very low at the acquisition time. Therefore there are very long and dark shadows from the mountains.
I'm able to identify this shadow using a DEM, as described in this Question: How to Remove Topographic Effects Like Shadows from Landsat Image
How can I perform a supervised classification for the clipped shadowed area? Is it possibile to enhance this areas? I tried some band ratios, but I don't know which is the best for my task.
In this image you can see that there are some vegetated areas in the dark shadows, but it is not possible to classify them.