I have a raster with buildings that look darker. I want to detect the dark areas and enclose them with a polygon
What tools could I use with QGIS, ArcGIS, or Python to achieve this?
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It only takes a minute to sign up.Sign up to join this community
This amounts to translating the values contained in the pixels to obtain a layer vectorized thematic information. It is a work of classification. There are several methods. You can do it with QGIS (for example after having installed for example the OTB toolbox libraries (to download here: enter link description here or the plug in QGIS, the Semi-Automatic Classification Plugin (SCP) (to download here : `enter link description here
There are tutorials : enter link description here