| Technology and Methodology |
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Remote Sensing Images and DEM Registration Based on Illumination Model |
| HU Yong-xiu 1， LI hui 2,3， SHI Xiao-chun 4 |
| (1.Land and Resources Technology Center of Guangdong Province， Guangzhou 510075， China； 2.Geography Department, China University of Geoscience, Wuhan 430074, China； 3.Three Gorges Research Center for Geohazards, Ministry of Education, China University of Geosciences, Wuhan 430074, China； 4.Institute of Surveying & Mapping, Department of Land & Resources of Guangdong Province, Guangzhou 510500, China) |
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Abstract Registration between remote sensing images and DEM data is difficult because it is hard to find the Ground Control Points (GCPs) between the two images. In this paper, an illumination model was introduced and served as a proxy in the image registration to increase the registration accuracy. The aspect and slope were computed for each pixel of the image based on DEM data. The solar elevation angle and azimuth were obtained from the header file of the remote sensing image. Based on these parameters, the authors constructed the terrain illumination model based on the Lambert reflectance model, which displays very similar texture to the remote sensing image. Thus, the GCPs can be easily identified in the two images. This method was tested by using sub ETM+ image and DEM in Guangdong province. The result shows that the total RMSE of this method is 13.373 m, which is less than one pixel. This method is effective in the registration of remote sensing image and DEM, especially in mountain areas.
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| Keywords
Remote sensing
MODIS
LAI
Land types
Classification
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Issue Date: 22 March 2011
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2011,
Vol. 23
