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Systematic approach for precise correction and landcover classification of satellite images

卫星图像精确校正和土地覆盖分类的系统方法

基本信息

批准号：
14580440
负责人：
IIKURA Yoshikazu
金额：
$ 2.18万
依托单位：
Hirosaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14580440/
关键词：
precise geometric correction topographic effect correction digital elevation model landcover classification sky view factor view shed spatial segmentation mixed pixel ランドサットTM 精密幾何変換放射量補正現存植生図ベクターラスター変換正射投影変換 IDL 照り返し効果

项目摘要

In satellite images over rugged terrain, we can find some topographic effects entangled with atmospheric effects. Without correcting these effects, it is difficult to evaluate the satellite images for land cover classification and multi-temporal monitoring of natural environment. In order to reproduce these topographic effects in computer, we need digital elevation model(DEM) with the same map projection and spatial resolution as the satellite image concerned. The DEM is also required for accurate ortho-rectification of the satellite Image.In this research project, we systemize satellite image processing based on the principles of remote sensing, which is applied to Landsat TM images. The satellite images are automatically laid over the DEM by using the proposing geometric correction method which utilizes the simulated direct solar irradiance image. Advanced methods for topographic effect correction based on a physical model of satellite level radiance is also developed to a satellite image with high solar elevation.We also propose to model land cover as a tesselated spatial structure and apply the spatial segmentation to the image first. Then, mixed pixels are determined as the boundary pixels with definite end members found in neighborhood.

在崎岖地形的卫星图像中，我们可以发现一些与大气效应交织在一起的地形效应。如果不纠正这些影响，就很难评估用于土地覆盖分类和自然环境多时相监测的卫星图像。为了在计算机中再现这些地形效应，我们需要具有与卫星图像相同的地图投影和空间分辨率的数字高程模型（DEM）。 DEM还需要对卫星图像进行精确的正射校正。在本研究项目中，我们基于遥感原理系统化了卫星图像处理，并将其应用于Landsat TM图像。通过使用所提出的利用模拟直接太阳辐照度图像的几何校正方法，卫星图像自动覆盖在 DEM 上。基于卫星级辐射物理模型的先进地形效应校正方法也被开发用于具有高太阳高度角的卫星图像。我们还建议将土地覆盖建模为镶嵌的空间结构，并首先将空间分割应用于图像。然后，将混合像素确定为在邻域中找到的具有确定端元的边界像素。