Ortho-rectification software applicable for IKONOS high resolution images: GeoPixel-Ortho

GeoPixel-Ortho as a value-added processing module for generating ortho-rectified images in GeoPixel which is in-house remote sensing software, is introduced. To estimate sensor orientation parameters, a direct linear transform (DLT) method was implemented. The module was tested on an IKONOS scene over the south part of Seoul, Korea. The accurate location of ground control points (GCPs) was obtained by using GPS receivers. Although it was hard to evaluate highly reliable sensor parameters using the DLT model because of a lack of sensor related information, the overall accuracy of horizontal error on the test area was estimated to be between 1 and 2 pixels. Further research on estimating more accurate sensor parameters to improve the performance of the DLT model will be done.