空间分辨率对水体遥感信息提取的影响

以庐山及其周边作为研究区域，以MODIS、Landsat ETM+、SPOT以及GeoEye为数据源，对比分析了不同空间分辨率影像上水体的表现特征和影像所提取的水体结果的差异. 结果表明:在地形较为平坦、边界较为规整、水体面积较大的区域，空间分辨率对提取效果的影响较小；反之，提取面积误差会随着空间分辨率的降低而增大. 在地形平坦、边界规整、水体面积较大的区域，ETM+影像能很好地满足精度要求；而在地形崎岖、边界粗糙、水体面积较小的区域，综合考虑精度要求、经济成本和时间成本，适合采用分辨率为10 m的SPOT影像提取水体.

Influence of the Spatial Resolution of Remote SensingImages on Water Information Extraction

With the development of remote sensing technology，the spatial resolution of satellite remote sensing image has increased greatly，which enriches the research of water body in land cover. In this paper，based on the MODIS，Landsat ETM+，SPOT and GeoEye image，water body of the Lushan area is extracted and compared. The paper discusses the image characteristics of water body and analyzes the accuracy of water information extraction from the remote sensing images with different spatial resolution. The results show that the effect of the spatial resolution on extraction of water body in the plain area is small，but the extraction errors will increase with the lower spatial resolution. The ETM+ image in the plains area and the SPOT image in the mountains can meet the accuracy requirements considering the economic costs and time costs.