Authors : E.M. Elhadi , Hu .Guangdao and N. Zomrawi
Abstract: Pixel resolution is one of the main factors that affecting the final result in digital photogrammetry in general and in digital photogrammetric workstation in particular. An aerial wide-angle hard copy stereo pair was transformed to a soft copy using different scanning resolution by special photogrammetric scanner. Digital photogrammetric workstation was used to measure a number of control points of a known ground coordinates. ERDAS package was used to digitally rectify the scanned images using the same pixel resolution used above. And the coordinates of points were measured again. The results of this investigations proof that the accuracy of the measurements in digital photogrammetry is proportional to scanning pixel resolution in both horizontal and vertical measurements. And mathematical models were developed to estimate the accuracy via scanning resolution and suitable plotting scale in both horizontal and vertical mapping. Production of maps using digital image rectification using software packages such as ERDAS is suitable only in flat terrain. And digital photogrammetric workstation is a productive way for mapping in all flat and mountainous terrain.
E.M. Elhadi , Hu .Guangdao and N. Zomrawi , 2007. The Effect of Scanning Resolution in Digital Photogrammetric Workstation . Journal of Engineering and Applied Sciences, 2: 1786-1790.