Comparision of Spatial Accuracy and Cost in Digital Orthophoto Maps

Ömer MUTLUOĞLU, Ayhan CEYLAN

Abstract


In Geographic Information System ( GIS ) studies, spatial data obtained has been of great
importance. The achievement of GIS projects is dependent upon the accuracy and spatial data updated.
This is vital in terms of extravagant waste of national sources. The test area about 20 ha has been
established in Selcuk University Campus to compare spatial data for GIS. All detail points covering the
test area have been measured by polar coordinate method using electronic tachymetry and obtained
same coordinates with Digital Orthophoto production Method. Polar coordinate method (classical
method) has been accepted as a reference and it has been compared with the spatial data obtained from
digital orthophoto method in view of accuracy and cost. The root mean square (RMS) errors obtained
from comparisons have been found as mp=±53.7cm for digital orthophoto production method. The unit
cost (1 ha) is 95.86 $ for classical method, 21.93 $ for digital orthophoto production method.


Keywords


GIS; photogrammetry; digital orthophoto; electronic tachymetry; spatial data

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