Remote Sensing Orthophotoquad Generation without Employing DEM
无DEM支持的遥感正射影像制作

Remote Sensing Orthophotoquad (RSDOQ) has been widely used in the area of topographic map making and its revision, natural resource and environment surveying and monitoring, natural disaster mitigation and city planning etc.. However, for the generation of RSDOQ, DEM (Digital Elevation Model)is still needed to solve the issues of relief displacement for high resolution image (such as SPOT and IRS). According to the characteristics of aerial image and space remote sensing image, and the difference among topographic relief, this paper proposed and developed new methods of RSDOQ generation without using DEM. The presented methods include integrated geometric rectification in flat area, locally adaptive geometric rectification in medium relief area, and point to point geometric rectification in high relief area. Only DRG (Digital Raster Graphics), the scanned topographic man after geometric correction, is needed in our developed methods. Practical software has been developed and it will be used for the generation of digital orthophoto model (DOD) from remote sensing image in China.