University of Khartoum

Investigation the Potentiality of the Shuttle Imaging Radar for Topographic Mapping in Sudan

Investigation the Potentiality of the Shuttle Imaging Radar for Topographic Mapping in Sudan

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Title: Investigation the Potentiality of the Shuttle Imaging Radar for Topographic Mapping in Sudan
Author: Adil Mohamed Ahmed, El Sinnari
Abstract: The purpose of this study is to evaluate and investigate in an experimental test the possibilities of generating metric information and carrying out topographic mapping operations from side-looking radar images acquired from the Shuttle Imaging Radar Systems SIR-A and SIR-B flown onboard the American Space Shuttle over Sudan. In achieving this purpose, points that could be identified on both SAR images and topographic maps at 1:250,000 scales were selected. The image coordinates of these points were measured on a Rechtwinkel coordinatograph and then transformed into the ground coordinate system using control points derived from the maps. The geometric accuracy and image fidelity determined by computing the root mean square errors (r. m .s .e) of the discrepancies between the known and the transformed coordinates of the check points. The mathematical models of linear conformal, affine, projective and polynomial transformations were employed for this purpose. The geometric accuracy figures achieved were then compared with a known set of map accuracy standards. The results show that the geometric accuracy achieved from is SIR-A image of the test area is below the standards required for topographic mapping purposes; while that achieved from SIR-B images met the NATO specifications for topographic mapping at 1:200,000 scale and smaller. The thematic content of the SIR images was then explored by systematically examining and interpreting on the test images features believed to be important for topographic mapping at medium and small scales. The percentage of terrain features. Identified on SIR images was then compared with standard thematic accuracy figures. The results show that SIR-A imagery is not suitable for topographic mapping at any scale; while SIR-B imagery allowed a much higher percentage of terrain features to be identified and discerned which will make it suitable for topographic and thematic mapping at 1:500,000. It is therefore concluded that SIR-B images, as tested in this study, are suitable only for thematic mapping applications at scales smaller than 1:500,000 .
URI: http://khartoumspace.uofk.edu/handle/123456789/14580
Date: 2015-06-23


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