Skip Ribbon Commands
Skip to main content

King Faisal University

Center for Water and Environmental Studies

GEOREFERCING IRRIGATION AND DRAINAGE NETWORKS USING ADVANCED SPATIAL TECHNOLOGY

    Adel M. Elprince and Yousef Y. Al-Dakheel
    Water Studies Center, King Faisal University, Al-Hassa, Saudi Arabia


    • The locations of irrigation and drainage canals are, often, determined by visual estimations obtained from a base map for the project area. Occasionally, the water manager may need to use a map that contains little or no coordinate information. This is a problem if he intends to project this map with another in a multi-layer database. In this study we used the coordinates of selected ground control points (GCPs) obtained with a Trimble GPS unit to transform (register) the network base map (dated 1970; 1:10000-scale; unknown coordinate system) digitized in units of the base map into metric UTM system. Registration was done using affine transformation in ARC/INFO GIS. The accuracy of this procedure was analyzed by comparing the GPS positions of 40.72 km one-way-roads with their corresponding GIS transformed positions. A 45-m buffer was required for at least 95% of the GIS roads to occupy the same GPS road positions. The registered network map was successfully updated by overlaying a residential area map developed from recent SPOT image (1998) and a soil salinity map developed using variogram and kriging analysis with a scale of 1:45000 as an upper limit. Errors in the GPS measurements, digitizing, marking GCPs on the base map, and the transformation numerical method represented 4, 7, 22, and 67%, respectively, of the RMS error (22.5 m) introduced in the estimation of network positions.
:
edu.sa

جميع روابط المواقع الرسمية التعليمية في المملكة العربية السعودية تنتهي بـ sch.sa أو edu.sa