Accuracy assessment of digital terrain model data : a cost effective and analytical approach
Taiwo, Qudus O. & C.O. Adeofun
Digital Terrain Model is the most critical and cumbersome element of any large-scale mapping projects. Accuracy assessment of DTM data is an intricate but vital process. Over the years DTM data are collected utilizing either global positioning system (GPS) surveying techniques, photogrammetric (digital or analytical) or non-imaging airborne techniques. With the invention of differential GPS, more accurate height information of any topography can be acquired. In this paper, Global Positioning System (GPS) surveying techniques is used to assess DTM data produced from contour lines digitized from topographic sheet covering a study site (a mixed urban and sparsely vegetated area). Using various interpolation methods, quality accuracy of datasets was assessed with the aid of different established stations with known X, Y and Z values. The result revealed interpolation model with better accuracy. Furthermore, this method is quite economical when compared with other quality control tests for DTMs.
Event: 5th FIG Regional Conference for Africa : Promoting Land Administration and Good Governance
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