Abstract

Vertical Component of Topographic Survey Vs. SRTM, ICESat, NED Elevations
Track: Surveying
Authors: Nijaz Karacic, Randall Marshall

This Project documents the differences in results of the vertical component of obtained topographic survey for the larger area of Dallas Levees versus the NASA/NGA Shuttle Radar Topography Mission (SRTM), the USGS National Elevation Dataset (NED), and NASA laser altimetry mission the Ice, Cloud, and Land Elevation Satellite (ICESat). The typical mean vertical difference between the SRTM and the vertical component of the topographic survey was determined as approximately 4.4 meters, the typical mean vertical difference between the SRTM and ICESat elevations in this paper was determined as approximately 2.1 meters over bare ground, with the SRTM measuring lower elevations and the typical mean vertical difference between the NED and ICESat was determined as approximately 1.2 meters. Significant changes in the SRTM DEM uncertainties have been identified.The analysis portion of this research consisted at looking and comparing ArcMap shapefiles with raster imagery.