CLC90 -1989-1992 (85% from 1992), CLC2000 - 2000 and (1 from 2001)
Main ancillary data:
Aerial photographs(georeferenced and orthorectified) at scale 1:5000, 1:16,500, and 1:40,000.
Digital topographic maps at scales 1: 5 000; 1:25 000; 1:50 000; 1:100 000 and 1:200 000.
Digital city and thematic maps.
Vegetation map at scale 1:600 000
Tourist maps at scale 1:50 000
National statistical data
CORINE Land Cover Bulgaria digital data base:
CLS1990 - 60 Megabytes, more than 60,000 polygons CLS2000 - over 110 Megabytes, more than 52,000 polygons CLS change 1990 - 2000 - 7 Megabytes, 2,670 polygons