On the Merging of Heterogeneous Height Data from SRTM, ICESat and Survey Control Monuments for Establishing Vertical Control in Greece: An Initial Assessment and Validation
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Earth surface elevations can be utilized in a variety of applications including e.g., terrain reductions for accurate geoid modeling, assessment of the vertical accuracy of Digital Elevation Models (DEMs), geodetic monitoring and characterization of urban areas. In this paper we are concerned with the rigorous merging of heterogeneous height data for providing vertical control in Greece. We assess and validate the accuracy of 3" ×3" SRTM grid elevations in Greece (a) by using a set of Survey Control Monuments (SCMs), used for geodynamic applications or for conventional ground geodetic control, and (b) by using an elevation dataset derived from the Geoscience Laser Altimeter System (GLAS) on the Ice, Cloud, and land Elevation Satellite (ICESat).
In order to conduct a consistent comparison of these data sets we studied various datum and calibration issues, and used geoid undulations derived from the spherical harmonic representations of EGM96 and EGM08. We also used various interpolation schemes to calculate the SRTM grid elevations at the irregularly spaced SCMs and the ICESat’s footprint locations. Differences of the SRTM vis-à-vis SCM and ICESat elevations will be presented, together with a discussion of our findings regarding the various effects that influence any combination of these height data. The product may provide vertical georeferencing and associated height accuracy values which are deemed useful for numerous emerging applications such as environmental monitoring, remote sensing, lidar, and digital elevation modeling.
KeywordsSRTM ICESat Elevations Vertical control EGM08 KMSS04
The authors would like to thank the two anonymous reviewers of the initial manuscript for their useful comments and suggestions
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