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The Effect of Densification and Distribution of Control Points in The Accuracy of Geometric Correction


Mohamed ElAmin Ahmed Babiker, Safa Khalid Yousif Akhadir
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Geometric distortions are inevitable in aerial images due to many factors, such as the curvature and rotation of the earth and the motion of the scanning system. Ground control points (GCPs) are important features used in non-parametric approach for aerial image rectification. The most common approach for geometric corrections is the use of polynomials. . It depends on selection of several clearly discernible points, called Ground Control Points (GCPs), in the distorted image, and map them either to their true positions in ground coordinates (e.g. latitude, longitude) measured from a map, or to geo referenced image (corrected before), coordinates of corresponding points, through a mathematical transformation, that will convert the raw image coordinates into the desired coordinates. The rectification results are invested by using the total Root Mean Square Error (RMSE).

In this study two tests were carried out. Firstly, the distribution of three, six and ten control points were investigated .the second test examines the densification of control points and their effects in the accuracy of geometric correction. The bad location and bad distribution of the selected GCPs lead to an increase in the average RMS error value of correction of an image which should be taken into consideration; for example, the results obtain from the densified GCPs used to adjust the aerial   when GCPs had been selected in one line we did not achieved an image. The results obtained from the densified GCPs used to adjust the aerial photographs showed approximately the same results those in the first case.  Therefore, the use of the three GCPs is sufficiently enough to adjust the aerial image. The thing that preserve time and money. 

Mohamed ElAmin Ahmed Babiker, Safa Khalid Yousif Akhadir

Geometric Correction, Liner Error, RMS, GCP

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Publication Details

Published in : Volume 2 | Issue 1 | January-Febuary - 2016
Date of Publication Print ISSN Online ISSN
2016-02-25 2395-1990 2394-4099
Page(s) Manuscript Number   Publisher
65-70 IJSRSET151693   Technoscience Academy

Cite This Article

Mohamed ElAmin Ahmed Babiker, Safa Khalid Yousif Akhadir, "The Effect of Densification and Distribution of Control Points in The Accuracy of Geometric Correction", International Journal of Scientific Research in Science, Engineering and Technology(IJSRSET), Print ISSN : 2395-1990, Online ISSN : 2394-4099, Volume 2, Issue 1, pp.65-70, January-Febuary-2016.
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