الفهرس 
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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.