Preparation of 1:5000-Scale Topographic Maps for the Salalah Flood Control Study, Oman

The project involved the preparation of 1:5,000-scale topographic maps for the Salalah Flood Control Study in the Sultanate of Oman. Following the acquisition and ordering of high-resolution GeoEye satellite imagery, a comprehensive topographic survey program was implemented. Project control points were designed and established using dual-frequency GPS receivers, and stereoscopic processing of the satellite imagery was carried out for the project area. After performing geodetic computations and developing a three-dimensional terrain model (DTM) of the study area, 1:5,000-scale topographic maps and orthomosaic imagery were produced, covering an area of approximately 30,000 hectares.

  • To prepare 1:5,000-scale topographic maps for the Salalah Port Flood Control Study in the Sultanate of Oman.
  • To develop up-to-date maps using spaceborne photogrammetry and remote sensing technologies based on high-resolution stereo satellite imagery (50 cm).
  • Preparation of 1:5,000-scale topographic maps for an area of approximately 30,000 hectares using spaceborne photogrammetry techniques (GeoEye satellite imagery).
  • Procurement and acquisition of stereo GeoEye satellite imagery with 50 cm spatial resolution in natural color format.
  • Pre-processing of stereo satellite imagery, including format conversion, data compression, image enhancement, and image mosaicking and integration.
  • Collection of coordinates and specifications of existing geodetic control points from the National Survey Authority (NSA) of Oman.
  • Design and optimization of the spatial distribution of ground control points (GCPs).
  • Digital identification and targeting of ground control points on satellite imagery.
  • Field surveying and acquisition of ground control points using dual-frequency GPS receivers.
  • Feature interpretation and attribution in accordance with project requirements.
  • Computation and adjustment of ground control point coordinates.
  • Aerial triangulation and photogrammetric processing for the generation of a three-dimensional terrain model.
  • Preparation of a Digital Elevation Model (DEM).
  • Production of orthomosaic imagery.
  • Feature extraction and compilation of planimetric and topographic data using digital photogrammetric work stations.
  • Cartographic production of 1:5,000-scale topographic maps for the project area of approximately 3,000 hectares.
  • Structuring and preparation of all spatial datasets and mapping products in a GIS-ready format.
  • Despite operational constraints, all stages of map production (field surveying, geodetic computations, aerial triangulation, photogrammetric processing and compilation of topographic maps) were successfully completed within one and a half months following the acquisition of the satellite imagery and under the direct supervision of the Client’s Technical Office.