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Title: Generation of digital orthoimages from high resolution satellite images
Authors: Chen, Y 
He, Z
Issue Date: 2006
Source: International journal of geoinformatics, 2006, v. 2, no. 2, p. 69-75
Abstract: Digital orthoimages are the fundamental products for image maps, GIS image base, cartographic extraction, and map revision. This study investigates the methodologies to generate 1:5000/1:10 000 orthoimages. Based on the required accuracy standards we have developed an error budget model for the horizontal position and vertical position of a ground control points (GCP) and digital elevation model (DEM). The model then determines the methods to collect GCPs and the accuracy of a DEM. Two tests were conducted in Hong Kong to produce orthoimages with IKONOS Geo products at scale of 1:5 000 for various terrain conditions. One is in a hilly area covering the both sides of the Victoria Harbor with elevation ranging from 0 to 400 m, and the other is in a mountainous area covering Tai Mo Shan with elevation ranging from 0 to 950m. Different software and number of GCPs were used in the tests. The results indicate that it is possible to produce orthoimage at scale of 1:5000 for various terrain conditions with IKONOS Geo images and 7-11 GCPs per image provided careful design and operation of a project are exercised. Another test was also conducted to produce 1: 10 000 orthoimages with SPOT 5 images of 2.5m resolution. The test area covers the whole Hong Kong.
Publisher: Association for Geoinformation Technology
Journal: International journal of geoinformatics 
ISSN: 1686-6576
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