基于SRTM3的山区遥感影像地形校正研究

山区遥感影像的地形效应尤为明显,是利用遥感影像进行精确定量分析及应用的主要障碍。为提高地表参数遥感定量化精度,研究在SRTM3数字高程模型的支持下,利用Lambertian模型、归一化模型、C校正方法对山区TM影像进行地形校正实验。通过比较分析影像的校正效果及对地形变量与影像校正前后的辐射亮度值进行相关性分析,对利用开源SRTM3地形数据对山区遥感影像进行地形校正的可行性进行研究。实验表明除小部分区域由于SRTM数字高程模型本身的误差使得影像存在误校正外,利用SRTM3数字高程模型进行地形校正效果明显。

Research on Topographic Correction of remotely sensed image in rugged terrain areas Based on SRTM3

Topographic effect is an important phenomenon in digital remote sensing images, especially in rugged areas. It is one of the main obstacles to do quantitative analysis accurately by remotely sensed images and it also influent the applications of remote sensing images in other fields. For improving the accuracy of quantitative analysis of land surface parameters by remotely sensed images, the paper studies the removal of the topographic effect in rugged areas, using the Lambertian model, Normalized model and the C-correction method to do topographic correction experiments on one TM image, which is in support of the digital elevation model of SRTM3. By analyzing the topographic correction results and the correlation between topographic variables and the radiation brightness value of image to discuss the feasibility of using the open source data SRTM3 to do topographic correction. Experimental results show that the effects of topographic correction based on SRTM3 are obvious, apart from a small part of the image exist mistaken correction, which is due to the error of the SRTM digital elevation model.