Asghar Milan Lak; Majid Hamrah; Gholam Ali Majd Abadi
Volume 15, Issue 58 , August 2006, , Pages 10-17
Abstract
The collection of ground control points for photogrammetric blocks adjustment is one of the costly and time-consuming parts of photogrammetric surveying, and photogrammetrists have always sought a way to reduce the number of ground control points to the extent possible. Today, the application of GPS ...
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The collection of ground control points for photogrammetric blocks adjustment is one of the costly and time-consuming parts of photogrammetric surveying, and photogrammetrists have always sought a way to reduce the number of ground control points to the extent possible. Today, the application of GPS data in surveying activities has been widely considered: from acquisition of coordinates of ground control points to the obtainment of the coordinates of image centers and camera justification parameters at the moment of shooting, in Mobile Mapping, cadastral surveying and in combination of GPS data with INS2 data which is currently undergoing extensive research, because it reduces the number of control points. In this study, the precision of adjusted blocks with the help of GPS auxiliary data in the adjustment of the 1:25000 blocks of Iran with independent and bundle adjustment models methods has been examined, and the results of the study show that it gives satisfactory precision on the considered scale for the region of Iran.
Mohammad Javad Valadan Zowj; Asghar Milan Lak; Mahdi Gholam Ali Majd Abadi
Volume 14, Issue 55 , November 2005, , Pages 9-12
Abstract
Dynamism of satellite images with linear arrangement has made it possible to use highly complex algorithms requiring information from the satellite's orbit to carry out geometric correction of these images with high precision. On the other hand, in new satellite imagery, sellers of these images are not ...
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Dynamism of satellite images with linear arrangement has made it possible to use highly complex algorithms requiring information from the satellite's orbit to carry out geometric correction of these images with high precision. On the other hand, in new satellite imagery, sellers of these images are not interested in sending this information. For this reason, in order to perform the geometric correction of these images, we need new mathematical models to perform the geometric correction and meet the required precision without any need for satellite information. One of these models is the Rational Function Model, which is used for this purpose. The other is the modified DLT. In this paper, these models have been investigated for geometric correction of satellite images, for which purpose programs have been written in Visual C environment. To test these models, the results of these models’ implication on IRS, IKONOS and SPOT satellite images were surveyed. The results of this study showed that these models were able to perform the geometric correction of these images. Although they are less accurate than the models that use orbit parameters, the value of these models lies in their independence from satellite orbit parameters, their vast capacity of processing and also in the simplicity of these models.