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Abstract
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Article Information:
Assessment of Accuracy of Digital Elevation Model Generation from ASTER Stereo Images by Using Rational Polynomial Coefficients and Toutin’s Models
Kaveh Deilami and Mohd Ibrahim Seeni Mohd
Corresponding Author: Kaveh Deilami
Submitted: March 30, 2012
Accepted: April 20, 2012
Published: August 01, 2012 |
Abstract:
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This study aims to generate Digital Elevation Model (DEM) by utilizing Rational Polynomial
Coefficient (RPC) model (ENVI 4.8) and Toutin’s Model (OrthoEngineSE of PCI Geomatics 10.3) to determine
the suitable model. Thealong-track stereoimages of Advanced Spaceborne Thermal Emission and Reflection
radiometer (ASTER) sensor with 15 m resolution were used to generate DEM on an area with low and near
Mean Sea Level (MSL) elevation in Johor Malaysia. In addition, the area under study was divided into three
elevation ranges between 0-100 m (flat), 100-300 m (moderate) and 300-600 m (hilly) to evaluate the DEM
accuracy in various terrains. Consequently, the uncorrected DEM of RPC model yielded RMSEz of ±32.96 m
(0-100 m), ±23.38 m (100-300 m) and ±23.65 m (300-600 m) while after post-processing the RMSEz decreased
to ±17.69 m (0-100 m), ±14.08 m (100-300 m) and ±17.77 m (300-600 m). Overall, the corrected DEM of RPC
model reached the expectations with RMSEz of ±16.49 m. On the other hand, the DEM of Toutin’s model
contained many blunders and outliers which indicated the ineffectiveness of Toutin’s model for area with low
and near MSL elevation. The failure of Toutin’s model may mostly be due to the inaccuracy and insufficiency
of ASTER ephemeris data for low terrains as well as huge water body in the stereo images.
Key words: ASTER, digital elevation model, ENVI, low elevation, PCIGeomatics, satellite,
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Cite this Reference:
Kaveh Deilami and Mohd Ibrahim Seeni Mohd, . Assessment of Accuracy of Digital Elevation Model Generation from ASTER Stereo Images by Using Rational Polynomial Coefficients and Toutin’s Models. Research Journal of Applied Sciences, Engineering and Technology, (15): 2537-2542.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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