Using High Resolution Stereo Imagery for Contouring: Complex Terrain Contour Mapping of Naukandi, Balochistan

Topographic maps are large scale representation of earth features. Most important characteristic of these maps is third dimension representation of objects by using contour lines. Topographic maps are the base layers of any spatial data infrastructure. Advances in spatial sciences demand more accurate and up to date topographic representation. While traditional methods of topographic surveying are time consuming and impractical in complex topographic regions. Remote sensing and GIS techniques are being used to develop topographic data of such remote areas with great accuracy, less labor and time consumption. This study uses high resolution satellite stereo images to generate Digital Elevation Model (DEM) at 1 m contour interval of complex topographic region of Baluchistan, Pakistan. Stereo images are two satellite images of same position of the earth captured along the same track with different angles. For handling and processing the stereo images Ground Control Points (GCPs) are used. GCP is a permanent referencing points needs to orient the stereo images such that they are in the same orientation as the camera was at the time of exposure. Overlapping the stereo pair according to the well distributed ground control points generates the 3D surface which is generated from 2D stereo images. This 3D surface is being compared and validated with 90 m STRM’s and 30 m ASTER datasets of the same area. The pattern of contours at an interval of 1 m is being analyzed at all three sources of DEM and most accurate pattern is being identifies through this research.

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