[GRASS-user] How to extract linear structures like streets or rivers from orthophotos/satallite images

Hi pepole,

does anyone know of another module (or a method) besides i.cz to extract linear structures from a satellite image (or orthophoto) like streets, rivers, etc. ?
I’ve allready tried with a supervised as well as unsupervised classification but I did really get satisfying results.

Best Regards

Sascha


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