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O GPS field control 
A triangulated photo control (tie points) 
The Department of Surveying, School of 
Engineering, University of Zambia. 
Figure 1. Distribution of GPS field control and triangulated photo control around the project area. 
The GPS points and photo control determined by 
triangulation were plotted on a transparent overlay at 
1:50000 scale and used for rectification of each photograph 
with a Zeiss Jena Sketchmaster. Subsequently, all 
vegetation boundaries, as well as roads, water bodies and 
settlements, which had been ealier identified and marked 
on photographs in field, were transferred from the 
oriented photographs to the map overlay. A planimetric 
accuracy of the transferred features depends on accuracy 
  
of their identification and photographs’ orientation. The 
estimated accuracy ranged within 0.4 - 0.6 milimiters in 
the map scale. To match the new map overlay with the 
original 1:50000 map, six of determined points were 
identified on the original map. The content of the graphical 
original map and the graphical overlay with the vegetation 
boundaries and other new features, compiled with a 
sketchmaster, was digitized in the Manchester University. 
The graphic output is shown in figure 2. 
KASANKA NATIONAL PARK 
Figure 2. Vegetation polygons boundaries and other features around the project area. 
156 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996 
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ARC/INFO Ocogrephioal Information System 
Kasanke National Park 
  
  
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a 
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System 
Mepumiie of Bambie 
R4 Kasanka National Park 
  
ARC/INFO Oeegraphioe! Infermation