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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part Bl. Istanbul 2004 
  
  
  
  
  
Figure 1 The localization of the study area 
22 Satellite data 
Satellite data from Landsat TM and SPOT were used. The 
SPOT-5 data were made available by Spotlmage for this 
  
  
  
  
  
  
  
  
  
  
project. 
Satellite Date Mode Corrected Pixel 
by size 
Landsat-7 1999-09-04 MS Metria 25m 
SPOT-4 1999-06-02 XI Metria 20m 
SPOT-5 2002-08-19 XI Spotimage 10m 
SPOT-5 2002-08-19 pan Spotimage 5m 
SPOT-5 2002-08-19 pan Metria 2.85 m 
SPOT-5 2002-08-19 merged pan/  Spotlmage 2.5m 
XS1.3.3 
SPOT-5 2002-08-19 merged pan/  Metria 23m 
XS1,2,3,4 
SPOT-5 2003-06-02 XI Spotlmage 10m 
Table 1 Satellite data used 
2.3 Other input data 
- Digital map data from Geographical Sweden Data, GSD — 
digital topographic map database (National Land Survey of 
Sweden.) 
- DEM with 50m grid (base (National Land Survey of 
Sweden.) 
2.4 Preprocessing 
Orthocorrected SPOT-5 data (10m multispectral, 5 m pan and 
2.5 standard merged) and level 1A 2.5 m panchromatic were 
supplied by Spotlmage. DEM data and GCPs measured from 
Im resolution digital aerial orthophotos were provided by 
Metria. Landsat-7 ETM+ data, SPOT-4 data and the SPOT-5 
2.5 m panchromatic data were orthocorrected by Metria. RMS- 
residuals for the SPOT-5 2.5 m panchromatic data were better 
than 3m. 
2.5 Interpretability 
Figure 2, shows the same detail from different sensors and 
resolutions. A forest stand harvested between 1999 and 2002 
with seed trees left is seen (the light area at the right side of the 
road in the lowest 3 images). In the upper right part, areas with 
a typical pattern of lines are clearly seen in the panchromatic 
data. These areas are thinning cuttings performed, and are easily 
clearly detected and identified in the high resolution 
panchromatic SPOT-5 data (2.5m, 5m) but can also be detected 
in the 10 m data with some difficulties. The standard band 
combination used in all colour images is (SWIR, NIR, red) = 
(rgb). 
    
  
Ja arr Ri. ee c o 
Figure 2 Detail from the satellite datasets analysed. From top: 
Landsat-7, 1999-09-04, 25 m; SPOT-4, 1999-06-02, 20 m; 
SPOT-5, 2002-08-19, 10 m; SPOT-5, 2002-08-19, 5 m pan; 
SPOT-5, 2002-08-19, 2.5 m pan.