一、“十个生态系研究”的目的为了探索使用“陆地卫星”的多光谱影象以及相应的数据自动处理技术清查森林和草地资源的可行性,美国国家航天航空管理局L.B.约翰逊空间中心和美国农业部林务局,在1976年联合开展了“十个生态系”的研究。这个研究将美国大陆的连绵区域大约划分为十个生态群落。在这些生态系中比较它们的相似性和不同点。这一方法使这个研究既是建立在大量成功的局部研究的基础上,也是作为大规模研究的序曲。“十个生态系”研究的试验设计,有两个重要而又相关的部分。第一个部分称之为类型可分性研究。这一研究是以森林和草地的陆地卫星光谱反应为依据,测定和研究它们的细部 Aim of the “Ten Ecosystem Studies” In order to explore the feasibility of using multispectral images of “land satellites” and the corresponding automated data processing techniques to inventory forest and grassland resources, the NASA LB Johnson Space Center and The USDA Forest Service, in 1976, conducted a joint study of “Ten Ecosystems.” This study roughly divides the contiguous area of ​​the continental United States into ten ecological communities. Compare their similarities and differences in these ecosystems. This approach allows the study to be based on a great deal of successful local research and as a prelude to large-scale research. The experimental design of the “ten ecosystems” study has two important and relevant parts. The first part is called type separability studies. This study is based on the terrestrial satellite spectral response of forests and grasslands, measuring and studying their details