University of Khartoum

Extraction of Three Dimensional Ground Coordinates Based on Analyical Photogrammetry

Extraction of Three Dimensional Ground Coordinates Based on Analyical Photogrammetry

Show full item record

Title: Extraction of Three Dimensional Ground Coordinates Based on Analyical Photogrammetry
Author: El Amin Mohamed Banaga, Ahmed
Abstract: In the process of map compilation using stereo-plotting machines، ground control is needed. Each stereo-model requires at least 3 horizontal and 4 vertical ground control points. The establishment of such control by ground survey methods is time consuming and costly. Analytical aerial triangulation techniques based on the collinearity condition equations can be used for providing sufficient ground control from sparsely distributed، ground-surveyed control network. In this research work collinearity condition equations have been used for extracting three-dimensional ground coordinates from both close-range and aerial photographs. In these equations the two dimensional x، y photo coordinates were directly transformed into the three-dimensional X، Y، and Z object space coordinates. For camera calibration، the interior and exterior orientation parameters of the camera as well as differential scale factors along image axes are determined in the photogrammetric resection phase. Two computer programs were developed during period of this research project in FORTRAN language. The first program solves for ten parameters of inner and relative orientation for each photograph taken in a subsequent procedure (photo by photo). The three-dimensional ground coordinates were then obtained based on these parameters and the intersection procedure. The second program is based on bundle adjustment procedure. It solves for the ten parameters for each photo and .the ground coordinates in a simultaneous solution. . Two types of photo coordinates were used as data input in these programs. The first type of coordinates was obtained using a non-metric camera/comparator system. The second set of photo coordinates was obtained using the stereo-comparator of the A violyt BC2 analytical plotter owned by Sudan Armed Forces. The output of the two program solutions were compared with results obtained using the BC2 pre written software. Finally، contour maps generated from the derived ground coordinates by each of the two programs developed by the author were compared with maps obtained from the ground coordinates derived by the BC2 system.
URI: http://khartoumspace.uofk.edu/handle/123456789/15297
Date: 2015-06-28


Files in this item

Files Size Format View

This item appears in the following Collection(s)

Show full item record

Share

Search DSpace


Browse

My Account