In one of my projects I need to digitize video clips showing some natural landscape. Specifically I need to know distances between different areas and elevation levels.
I have a topographic map of the area so distances are not a problem.
Is there any tool / library that allows to create DEM from a common topographic map? A language of the library doesn't matter, but I prefer open source solutions if possible.
I know about QGIS and GRASS, but I cannot found how to use them for this specific purpose.
EDIT: My map looks like this: