Updating topographic map using SPOT 5 satellite imagery

摘要

SPOT 5 satellite imagery (PAN &XS) with a spatial resolution up to 2.5m and a 60km × 60 km coverage, has a great capabilities for topographic mapping. This paper describe processing procedure of SPOT 5 imagery for topographic map revision which have been developed recently in the Remote Sensing Center of the Ministry of Natural Resources and Environment (RSC/MONRE). In this procedure Ground Control Points were collected using GPS measurement which allow geometric correction of large block of SPOT scenes with high accuracy. SPOT images are rectified to created orthophoto-imagemap using DEM generated from 1: 50 000 map. In order to support features identification SPOT XS and SPOT PAN have been merged together by the Brovey transformation. The interpretation process has been carried out manually in the printed image map. It is found that SPOT 5 images can be used for updating topographic map at 1: 25 000 scale or even 1:10 000 scale depending on accuracy of geometric correction.