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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Richard J. U.1, and Chima Ogba2
Full-Text PDF
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DOI:10.17265/2332-8223/2016.02.006
Affiliation(s)
1. Department of Special Survey, Office of the Surveyor General, Moscow Road, Port Harcourt, Nigeria
2. MD. Geoid and Environmental Services Limited, Rumuomasi, Port Harcourt
ABSTRACT
The argument over the
accuracy of DEM data from Google Earth as compared to DEM generated from field
survey have created a lot of uncertainty among research communities and even in
the field of geo sciences domain for various applications. To some SRTM DEM
data deviation from other DEM data may not support most application areas and
others suggest that the deviation of Google Earth DEM is reasonable to support
most application areas including researches. This research paper give an
illumination of the level of relationship between field survey DEM and Google
Earth DEM carried out on a section of ADAMA farm project site located in Etche
Local Government Area, Rivers State, Nigeria. The study utilized field survey
elevation data obtained using Promark 3 DGPS at 50m x 50m grid interval and
Google Earth elevation data obtained using KML. The KML file was first created
in ArcGIS 10.1 before exporting to Google Earth and the elevation of each point
was extracted using GPS visualizer. Spatial database was created from the two
elevation datasets and the following DEM surfaces; TIN, and contour map were
produced. The study concluded that TIN model produced from field survey and
Google Earth elevation represent uniform topographic surface but the major
difference is the inability of Google Earth elevation to show steep slope, a
situation that was accounted for by field survey DEM. Also the linear
relationship between field survey elevation and Google Earth elevation data
resulted in correlation coefficient (r) 0.665 indicating perfect positive
relationship as tested using Pearson’s correlation algorithm. DEM data from
Google Earth elevation with improvement in technology may come to a stage of no
argument or if exist will be negligible for topographic modelling.
KEYWORDS
Field survey, Google Earth, DEM, correlation analysis.
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