International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
CONCLUSION 
Experience with mapping vegetation communities in national 
parks units in the southeastern United States has led to the 
development of streamlined methods for the extension of 
ground control in remote areas using softcopy photogrammetry 
and analytical aerotriangulation techniques. Basic ground 
control extracted from standard USGS digital orthophoto 
quarterquads (DOQQs) and digital elevation models (DEMs) 
provide the framework with which a large number of aerial 
photographs of areas that have nearly continuous tree canopy 
cover can be controlled. Although a number of rectification 
  
  
methods are available, it was found that for areas of high relief, KE 
overlays delineating vegetation polygons are more accurately 
transferred to a GIS database if they are first orthocorrected 
using photogrammetric differential rectification techniques. ABS 
This method improves not only positional accuracy but also 
ease of editing and edge matching polygons from adjacent The 
photographs. In a test polygon, area calculation was in error by sens 
as much as 40% when simple polynomial rectification was stan 
performed on an area with very high relief. high 
it 1s 
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