1023 
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B7. Beijing 2008 
80000 
70000 
60000 
50000 
40000 
30000 
20000 
10000 
—♦—Area 
Linear (Area) 
1998/07 1999/07 2000/07 2001/07 2002/07 2003/07 2004/07 2005/07 2006/07 
Area 53046.4 37513.3 31835.1 38680.4 31476.5 71621 35983 2 27899.3 40641.7 
Figure 5. Change of vegetation area between years 1998-2006 
Figure 6. Change of vegetation area between years 1998-2006 
Fleute, A.R., 1998, A soil-adjusted vegetation index (SAVI). 
Remote Sensing of Environment, 25, 295-309 
Mijiddorj, R., Bayasgalan, Sh., 2006, “Integrated Assessment 
on Drying Process in the Ongi River Basin”, Ulaanbaatar, 
Mongolia 
“NGO ONGIINHON”: http://www.onggiriver.com/ 
SPOT-VEGETATION: http://www.free.vgt.vito.be/ 
ACKNOWLEDGEMENTS 
We would like to thank SPOT /VEGETATION 
(www.free.vgt.vito.be) data center for providing satellite data 
and “NGO ONGIINHON” in Mongolia for their contribution to 
ground truth collection. 
in the 
Onggi river basin /MSAVI/. 
45000 
40000 
35000 
30000 
25000 
20000 
15000 
10000 
5000 
1998/07 1999/07 2000/07 2001/07 2002/07 2003/07 2004/07 2005/07 2006/07 
Area 40640.6 27403.2 23171.5 29169.8 14780.7 37807 24531.1 18196.2 28921.2 
in the 
Onggi river basin /NDVI/. 
REFERENCES