TY  - JOUR
T1  - The Effect of Scanning Resolution in Digital Photogrammetric Workstation
AU - , E.M. Elhadi AU - , Hu .Guangdao AU - , N. Zomrawi 
JO  - Journal of Engineering and Applied Sciences
VL  - 2
IS  - 12
SP  - 1786
EP  - 1790
PY  - 2007
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2007.1786.1790
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2007.1786.1790
KW  - Digital photogrammetric
KW  -pixel resolution
KW  -planimetric
KW  -scanning
AB  - 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.
ER  -