الفهرس | Only 14 pages are availabe for public view |
Abstract Earlier, digital map production was depending on the field work, which requires numerous man-power with adequate technical capacities, different instruments, adjustments, sufficient time, and high cost. The advent of High Resolution Satellite Imagery (HRSI) led to a promising decade in creating digital mapping for different tasks. In addition, the capability of generating stereo images oriented to a new era in extracting Digital Elevation Model (DEM) that represents the elevation of terrain over a specified area. DEM is a prerequisite in many applications such as generating Ortho-images, extracting contour lines, modeling water flow, extruding 3D-views Geographic Information Systems and many others. The main target of this research is to generate digital products using High Resolution Stereo- Optical Satellite Imagery and evaluating their accuracies. The research focuses on producing digital map using the Heads-up Digitizing (On- Screen Digitizing) of the satellite Imagery, generating DEM from the stereo images and modeling the water flow using the generated DEM. In order to imply the proposed study, a stereo-pair of 1m High Resolution optical satellite imagery for Wadi seidna that is located at the north of Khartoum was collected, registered, and processed. A well distributed set of ground control points was determined and then surveyed using GPS technique. Some of those points were used as control points while the other points are utilized as check points in order to evaluate the accuracy of the digital map, the extracted digital elevation model, and the generated water flow model. Based on the attained results, it can be concluded that 1 m HRSI can be used to generate 1: 5000 Digital map. Also, the generated DEM is accurate enough for producing 1: 10,000 contour maps. |