Abstract
The investigation of interpretability of panchromatic satellite image GF-1 integrated with multispectral image with the purpose of producing image map and updating Egyptian topographic map topo has been described. A main objective of this research is to evaluate china GF-1 images for producing and updating topographic maps. The study has been chosen the area of the topographic map sheet at the scale of 1:25000 located in Cairo Governorates and made in 1977 and updated in 1990. In this study, the high resolution GF-1 MSS and PAN satellite images covering Cairo City, Egypt have been used. The proposed methodology based on producing image sheet map and evaluation updating topographic maps according to Egyptian specifications using GF-1 MSS, GF-1 PAN and the integration of GF-1 MSS and PAN. Results are discussed with reference to the specifications required for the scale 1: 25 000 Egyptian topographic maps. The results of these evaluations show that integration of GF-1 MSS and PAN images, from the point of geometric accuracy and Information content have the capability of 1:25,000 scale maps revision with difficulties in identification and extraction some features can be completed using other mapping methods.
Highlights
Most developing countries have great difficulties in systematic updating of their maps
The Results of Evaluation Information Content appeared in the Multispectral MSS and Panchromatic PAN GF-1 Image for updating maps at 1:25,000 scale showed that:
On the basis of the research carried out about cartographic potential of GF-1 MSS multispectral combined with GF-1 PAN panchromatic china satellite images used for updating Egyptian map scale of 1:25 000, the following conclusion could be drawn:
Summary
Most developing countries have great difficulties in systematic updating of their maps. Maps are essential database for both planning and fieldwork operation. Up-to-date maps are necessary because obsolete maps creates so many problems to engineers, planners and other professionals who need to develop their work based on updated records (Ajayi, 1992; Abdel Mageed, 2000). In the past mapping using digital aerial photos has become very popular several years, but the use of satellite images for cartographic and updating maps was limited by image resolution (Cheng, P. and Toutin, T., 1997). The application of remote sensing data could be an alternative method of supplying information relevant to topographic map production, revision, and updating, which is repetitive, cost-effective and relatively fast operational monitoring system (Pohl, 1996).
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