10 
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International Archives of Photogrammetry and Remote Sensing. Vol. XXXII Part 7C2, UNISPACE III, Vienna, 1999 16 
I5PR5 
UNISPACE III - ISPRS Workshop on 
“Resource Mapping from Space” 
9:00 am -12:00 pm, 22 July 1999, VIC Room B 
Vienna, Austria 
ISPRS 
Figure 4: Status of Mapping (U.N. Statistics 1990) 
The result has been that a global coverage only exists at scales 
smaller than 1:250 000. At 1:50 000 about 2/3 of the land area 
are covered and at 1:25 000 about 1/3. 
What is even more alarming is that the present update rate for 
the 1:50 000 map is only 2.3 % and that of a 1:25 000 map 4.9 
%. Thus the average age of a 1:50 000 map is 45 years and that 
of a 1:25 000 map 25 years (see figure 5). 
1:25 000 
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