Hey folks! I am new to IDL and will work with it on both optical and
radar imagery. I want to extract features like lines, regions,
polygons etc. and compare them on a symbolic level i.e. in vector
space. For example, I want to compare the lengths of two lines, the
enclosed angle and possible junctions. Do you guys know any library
who enables comapring features on a symbolic (no pixel level!) level?

Cheers
Jan