International Archives of Photogrammetry and Remote Sensing. Vol. XXXII Part 7C2, UNISPACE III. Vienna. 1999 
65 
I5PR5 
UNISPACE 111 - ISPRS Workshop on 
“Resource Mapp ing from Space ” 
9:00 am -12:00 pm, 22 July 1999, VIC Room B 
Vienna, Austria 
ISPRS 
represented the auxiliary etalon. Aggregated CLC90 data with 
the Landsat MSS were visualised in the right window. CLC70 
database was created gradually, polygon after polygon, based on 
the identified shape and size changes of the corresponding land 
cover classes. Identified change in CLC70 database was 
accepted only in case if the area of the changed polygon was 
larger than 4 hectares. Identification also respected the requests 
of spatial characteristics of the generated database in the sense 
of the CLC project methodology, i.e. the resulting polygon had 
to comply with the criterion of the minimum area 25 hectares 
and the minimum width 100 metres. In this stage also the 
original CLC90 database was revised while the occasional 
corrections (modifications) of the original CLC90 database 
were also realised in the newly created CLC70 database. 
Mosaicking of the individual map segments of CLC70 resulted 
in a single data layer. While aggregating the segments the 
control procedures and correction of physical and logical 
integrity of the data were carried out using the Avenue scripting 
language. These included elimination of the polygons not 
complying the area request, correction of aggregation 
inconsistencies, etc. 
In the next stage the CLC70-90 change database was created by 
overlying the CLC70 and CLC90 data sets. The resulting 
database was tested on presence of polygons not complying 
with criterion of the smallest 4 ha area. The polygons smaller 
than 4 hectares were excluded following the border tests while 
the condition was to preserve the original structure of CLC90. 
The only exception of the quoted criterion were the polygons 
artificially limited by the state border. 
2.2 Methodology of the landscape changes 
ANALYSIS 
The classes of CLC70-90 change databases were reclassified 
into 7 types of landscape changes according to the conversion 
table (see Tab. 1). 
The statistics - contingency tables (see Tab. 2) - were calculated 
using standard GIS cross-tabulation procedures, the first 
expressing the changes in hectares, the second the same in 
percentage. They express thematic re-distribution of individual 
classes within the studied period. 
Spatial intensity of landscape changes was expressed by a set of 
8 maps (7 maps - individual type of changes, 8 map depicts the 
total area of all 7 types of changes), at original scale 1:3 million. 
The maps show spatial extent of changes recalculated to a grid 
with resolution 1.5 x 1.5 km. The four intervals of the landscape 
changes spatial intensity were considered. (Feranec et al. 1999): 
1. 76-100 % of the grid cell area was changed - full change, 
2. 25-75 % 
substantial change, 
3. 1-24% 
minor change, 
4. 0 % “ - no change. 
Tab. 1 Conversion table (Feranec et al. 1999) 
no change 
intensification of agriculture 
extensification of agriculture 
urbanisation (industrialisation) -except transition to class 131 
enlargement (exhaustion) of natural resources -transition to class 131 onlv 
affore staton 
de fore stafion 
other antropogenic causes (recultivations, dump sites, unclassified change, etc.) 
CLC - levell 
1 artificial areas 
2 agricultural areas 
3 forest and semi-natuial areas 
4 wetlands 
5 water bodies 
CLC nomenclature (Hevmann et al. 1994) 
1. Artificial surfaces 
1.1. Urban fabric 
1.1.1. Continuous urban fabric 
1.1.2. Discontinuous urban fabric 
1.2. Industrial, commercial and transport units 
1.2.1. Industrial or commercial units 
1.2.2. Road and rail networks and associated land 
1.2.3. Port areas 
1.2.4. Airports 
1.3. Mine, dump and constructions sites 
1.3.1. Mineral extraction sites 
1.3.2. Dump sites 
1.3.3. Construction sites 
1.4. Artificial, non agricultural vegetated areas