Dear Ahmed
there is no method to extract Vacant land by normal classification because the classification based on pixel value which reflect the surface type . the vacant land has no pacified surface or soils i mean may be initially roads or airport or any empty land .
so the only way to extract vacant land based on visualization method .
greetings
okay you can export DWG files to shape files pr data base then only selct start editing from editing menu and you can modified any elements on drawings .
hello everybody
i would like to introduce my self
my name Ahmed Omar from Egypt (Cairo)
my studying field is geomatics (remote sensing and gis specially)
i have got at gis diploma and now am in pre master stage
UNIGIS salazburg university Austria the hazard facing is my area of interest
I am happy to communicate with you and I am happy friendship
Ahmed Omar
[email protected]