TERRAIN-BASED COMPARATIVE ASSESSMENT OF ELEVATION PROFILES FROM GROUND SURVEY (GPS AND TOTAL STATION) AND SRTM DEM IN AN UNEVEN LANDSCAPE AT THE SCHOOL OF GENERAL AND ADMINISTRATIVE STUDIES, (SOGAS)
Abstract
Accurate topographic data is essential for land management, urban planning, and environmental studies. While satellite-derived DEMs like SRTM offer global coverage, their vertical accuracy may be compromised by terrain complexity and vegetation. This study evaluates the accuracy and terrain representation of the SRTM DEM for the mixed-terrain environment of the School of General and Administrative Studies (SOGAS), Federal Polytechnic Idah, Kogi State. High-precision ground-surveyed data from GPS and Total Station were compared to the SRTM DEM through interpolated elevation surfaces. Key terrain attributes—elevation, slope, and contours—were statistically and visually analyzed to quantify vertical errors and assess terrain influence. Findings provide an empirical basis for DEM suitability in precision applications within the study area, informing reliable geospatial analyses and future data source selection.
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