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美国“陆地卫星”(Landsat)系列对地观测任务从1972年延续至今,已开展了40年。其观测数据广泛应用于农业、水文管理、灾害响应、科学研究和国家安全等领域。目前,美国地质调查局(USGS)存档的图像数量已超过280万张,而且每天大约可以新增440张图像。“陆地卫星数据连续任务”(LDCM)卫星是最新的一颗“陆地卫星”系列卫星,其任务目标在于保持观测数
The United States “Landsat” series of earth observation missions have continued from 1972 to the present and have been in operation for 40 years. Its observations are widely used in agriculture, hydrological management, disaster response, scientific research and national security and other fields. Currently, the United States Geological Survey (USGS) has archived more than 2.8 million images and can add approximately 440 images per day. The Landsat Continuous Mission (LDCM) satellite is the latest in a series of “Landsat” satellites whose mission is to maintain the number of observations