Evaluation of EGM 2008 with EGM96 and its Utilization in Topographical Mapping Projects

Autor: P. Srinivasulu, P. V. S. S. N. Gopala krishna, Bellamkonda Sadasiva Rao, Gumudavelli Anil Kumar, V. Raghu Venkataraman
Rok vydání: 2011
Předmět:
Zdroj: Journal of the Indian Society of Remote Sensing. 40:335-340
ISSN: 0974-3006
0255-660X
DOI: 10.1007/s12524-011-0131-1
Popis: Precise terrain elevation information is required in various remote sensing and Engineering projects. There are many technologies to derive the terrain elevation information like GPS, ground surveys, LiDAR, Photogrammetry. GPS is the most widely used technology to obtain information due to its ease of operation. However the usage of ellipsoidal heights, i.e. with respect to WGS84 has limited usage in hydrological applications. GPS heights must be converted into orthometric heights for use in hydrological applications, and this requires geoid undulation information. These geoid undulations can be deduced from earth gravity models. There are various earth gravity models available for ready usage like EGM96, EGM2008, GFZ96 in the public domain. This paper discusses the improvements observed in deriving orthometric heights using EGM2008 over its predecessor model EGM96. The utilization of the new model in topographical mapping projects are also presented.
Databáze: OpenAIRE
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