I have this map (have whole country, this is just a sample, original map also contains color symbology for the value classes) and need to attach the values from it to points. I have no problem to georeference it in QGIS but there is problem with the values.
I see two uncomfortable possibilities:
1) attach the values manually using the map legend.
2) manually vectorize the map in QGIS and add the value classes
But it would be nice, if I could somehow (semi-)automatically vectorize the map using the color (RGB?) values to build the vector classes in shapefile format. Is this possible?
I have here SAGA GIS, QGIS and I have also access to one PC with Arcgis 10 with Spatial and 3D analyst. Is it possible or do I have to use the manual way?
PS: it is almost impossible to obtain source data (will try, but I am pessimistic in this way)