近二十年,光学遥感仪的迅速发展,已经使气象卫星和地球资源卫星相继实用化。它摄取地球表面或大气层的视频图像数据,不停地从卫星送回地球,为现代的社会生活提供必不可少的信息资源。一、空间分辨率和光谱分辨率目前实用的光学遥感信息获取手段,是根据光学-机械扫描成像的原理,在预先设定的光谱波段里摄取目标区的图像数据。图像像元的张角(即空间分辨率)以及光谱波段的宽度(即光谱分辨率),是衡量图像质 In the recent two decades, the rapid development of optical remote sensing instruments has made the use of meteorological satellites and earth resources satellites one after another. It captures the video and image data of the Earth’s surface or the atmosphere and keeps sending it back to Earth from satellites, providing essential information resources for modern social life. I. Spatial Resolution and Spectral Resolution At present, the means of obtaining optical remote sensing information is based on the principle of optical-mechanical scanning imaging, and takes the image data of the target area in a predetermined spectral band. Image pixel aperture (ie, spatial resolution) and spectral band width (ie spectral resolution), is to measure the image quality