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Abstract
Accuracy Issue of DTM Available with Google Earth
Dr. Kamal Jain
Professor
Department of Civil Engineering, Indian Institute of Technology-Roorkee,
India
Email: kjainfce@iitr.ernet.in
A Digital Elevation Model (DEM) is a digital representation of a portion of the earth’s surface. In a DEM, earth’s surface is represented as spatially referenced regular grid points where each grid point represents a ground elevation value. It has been known that DEMs have a potential for solving theoretical and applied problems in earth science. Digital elevation data has tremendous, but often under-utilized, potential to create highly useful Geospatial Information System (GIS) digital data layers for many natural resource applications. Automated interpretation of digital elevation data has, until recently, often been limited to the calculation of a basic set of terrain derivatives supported by most commercial GIS software, namely slope gradient, aspect, profile and plan curvature. Google Earth is providing much information related to GIS for earth resource applications. Digital Terrain Model is one of the data proving in high accuracy with 1m contour interval data set. This paper presents accuracy aspect on DTM extracted from Google Earth and degree of compatibility in Geomatics applications.
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