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一、引言美国1982和1984年相继发射陆地卫星4和5号,星上携带第二代多光谱扫描仪——TM(专题成像仪)。TM探测地物辐射的灵敏度提高、量化等级增加、空间分辨率改善、光谱通道也进行了调整与扩展(表1)。为增强资源卫星遥感能力采取这些措施,有用信息究竟增加多少?能给用户带来多大好处?有什么特点?这是遥感应用各领域普遍关心的问题。国外从不同角度用不同方法开展了一些研究。我国引进的遥感卫星地面站已投入运行,覆盖我国大部国土的TM数据将可源源不断提供使用。今后一段时期TM图像将成为主要遥感数据源之一。有鉴于此,决定首先结合全国土地利用清查与动态监测任务,开展TM数据信息特征及
I. INTRODUCTION The United States launched Landsat 4 and 5 successively in 1982 and 1984, carrying the second generation multispectral scanner - TM (thematic imager). The sensitivity of TM to detect ground-based radiation is increased, the quantization level is increased, the spatial resolution is improved, and the spectrum channel is also adjusted and expanded (Table 1). What are the benefits of using these measures to enhance the capacity of satellite remote sensing for resources, how much useful information can be added, and what are the characteristics? This is a general concern in various fields of remote sensing applications. Foreign countries have carried out some studies in different ways from different perspectives. The introduction of China’s remote sensing satellite ground station has been put into operation, covering most of China’s territory TM data will continue to provide a steady stream of use. TM images will be one of the major remote sensing data sources for some time to come. In view of this, the decision to first combine the national land use inventory and dynamic monitoring tasks to carry out TM data and information characteristics