3 sets of IKONOS images and 20 sets of Spot-5 images were successfully geometrically corrected
with transformed RSO coordinate with RMSE ± 0.5 pixels to ensure accuracy of the sprawl.
In fact, this RMSE has been widely used as a good practice to ensure good geometric output apart from ensuring sound configuration of ground control point that is evenly distributed in the study area.
Fill this imagery is also subject to image enhancement. The image classification was carried out in two steps process to produce first level classes of built and un-build areas, and further detailed land use classes within the built-up areas.