GDEST 2008 Conference Sessions
Theme 1 - Observing Africa
Mapping Land Collapse Hazard using SRTM Data and Geographic Information System in the Egyptian Terrain
Mohamed Hegazy, National Authority for Remote Sensing and Space Sciences (NARSS), Egypt
Mapping geohazards is the backbone of decision making for strategic land use planning. This paper aims at setting a geographic information system (GIS) based methodology for identifying and mapping areas of land collapse hazard and its possible impacted vulnerable areas. Shuttle Radar Topography Mission (SRTM) data was used to create terrain characteristics layers. These maps include elevation zones and slope. Landsat TM mosaic for the Egyptian territory was used to delineate the lineament map of Egypt. The analysis of the various layers have been conducted which, included the creation of lineament density for the fractures and fault map. The other analysis procedures include reclassifying of the slope angle map, seismic intensity zone map, lithology (rock type) map, elevation zone and slope. Cartographic model has been conducted using ArcGis 9.2 software. The output of the model pointed out areas of high vulnerability to land collapse geohazard that include landslides and rock falls. The resultant map is essential prior to locating development corridors, roads, highways and new settlements. It also provides indicators for the vulnerability of the existing infra structures in need for environmental management.