دراسة منهجية مقترحة لتحديث الخرائط الطبوغرافية اعتمادا على الصور الفضائية المقومة بنموذج ارتفاعي رقمي

Abstract EN

The research aims to find an appropriate scientific methodology to updating the 1:200000 scale.

Topographic maps which refer by their history to different issues.

The proposed strategy can follow all changes on the ground and implement them as soon as possible and at minimal cost by depending on the unique satellite images instead of resorting to the couples of the Aerial photographs which require obtaining it in considerable period of time in addition to the equipment and accessories which are so expensive.

To benefit from the unique spatial image so it must be corrected from the geometric distortions by the orthorectification method as the modern digital way to treat the Satellite image which we did according on the DEM (Digital Elevation Models) for the areas on the earth which their maps need to be updating.

Therefore this DTM was produced on the basis of the 1:200000 scale maps utilizing the 20 m contour lines, so the model's height accuracy was 6.5 m and this value represent the nearest value from the Map height accuracy of 1/200000.

We Implemented the methodology proposed in this research on the Satellite image 10m resolution SPOT4 for the south region of Syria, and from it we find the orthorectification accuracy equal 56.28 m, so this value is the nearest value from the graphical accuracy map 1:200000 scale which equal 60m.

By comparing between the map produced in 1986 and the orthorecified Satellite Image captured in 2008, we could observe all changes on the earth and we found the appearance of new elements being inexistent on the map which the total of this recent elements just 50% of the existent elements on the map, in addition of updating all details modification as a result of the expansions of cities and the changement of the track roads