Generation of DEM and Ortho–image from High  Resolution Stereo Satellite Data for a selected part  of Southeast Bangladesh

Md. Fazlul Haque; Md. Mostafizur Rahman Akhand; Dr. Dewan Abdul Quadir

Volume : IV, Issue : I, January - 2014

Generation of DEM and Ortho–image from High Resolution Stereo Satellite Data for a selected part of Southeast Bangladesh

Md. Fazlul Haque, Md. Mostafizur Rahman Akhand, Dr. Dewan Abdul Quadir

Abstract :

In the present study, Digital Elevation Model (DEM) has been generated from clipped part of GeoEye-1 PAN stereo pair of 0.5m resolution for selected hilly areas of Chittagong district. GPS survey has been conducted to collect Ground Control Points (GCPs) for satellite triangulation. DEMs and corresponding ortho-images with GCPs and without GCPs were generated using the scientific Leica Photogrammetry Suite (LPS) software. The accuracy has been assessed and compared. The overall RMSE for satellite triangulation using GCPs has come to 0.09535 pixels (0.05m). Accuracy of 0.0577m, 0.0540m and 0.335m was achieved in X, Y and Z directions respectively. The vertical accuracy of 0.2970m has been estimated using independent check points. The evaluation indicates that the relative DEM underestimates the absolute DEM by a height of around 5.2m. The study shows that the generated DEMs provide useful information on positions, distances and areas of three dimensional hilly regions.