significant, landscape ecological stratification (Kloosterman et al., 
1995; Janssen et al., 1996). Hence the optimal use of the potential 
of digital images is achieved in combination with a stratification 
on the basis of visual stereoscopic interpretation of aerial 
photographs. 
5. ACKNOWLEDGMENTS 
The authors wish to thank Harry Landa, Raymond Feron, Ed 
Vaessen, Jeroen Huising and John Janssen for their 
contributions to this paper. 
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