正射遥感影像地图制作技术在岷江上游滑坡研究中的应用

正射遥感影像地图是对遥感数字图像进行几何校正和投影差改正 ,并与数字化的简化地形图复合的一种新图 ,或是直接用遥感图像采用特定方法生成的具有地形要素的一种新的图种。该文介绍了陆地卫星 TM正射遥感影像地图的制作 ;利用卫星正射遥感影像地图 ,分析、解译出岷江上游地区 87个滑坡和崩塌体。采纳数据融合技术 ,对该区正射遥感影像进行重建 ,突出地形细节 ,提高了滑坡和崩塌体的解译精度。 3S技术结合 ,对岷江上游地区进行了三维重现 ,建立了岷江在汶川 -茂汶段的遥感信息三维模拟图。

Applications of orthophotomap of landsat TM to the study of cracks and landslides on upper reaches of the Minjiang River

The orthophotomap is a new type of map that is accurately rectified for geometry and is composed with a simplified topographic map, or a new type of map that comes from remote sensing image which can provides some topographic items. In this paper, the making flow of landsat TM orthophotomap is introduced. The main steps are: (1) select accurate GCP; (2) digitalize topographic map; (3) produce DEM from the digital topographic map; (4) rectify TM image using DEM and GCP; and (5) add graphic factors. With the orthophotomap, a geological disaster map was produced, and 87 landslides and cracks which stop up water body of Minjiang river were determined. Using the data fusion method, the orthophotomap of this area was rebuilt, topographic details were emphasized, and the interpretation accuracy was improved. Combining with 3S technology , 3 D view of the Wenchuan Maowen part of Minjiang River was established.