Tri-Decadal Global Landsat Orthorectified TM Mosaics: 1984-1997

The Landsat TM Orthorectified Mosaics data collection is derived from a global set of high-quality, relatively cloud-free orthorectified TM imagery from Landsats 4-5. This dataset was selected and generated through NASA's Commercial Remote Sensing Program, as part of a cooperative effort between NASA and the commercial remote sensing community to provide users with access to quality-screened, high-resolution satellite images with global coverage over the Earth's land masses. The data collection was compiled via NASA contract with Earth Satellite Corporation (Rockville, MD) in association with NASA's Scientific Data Purchase program.

The Landsat Orthorectified TM Mosaics data collection is derived from approximately 7,461 TM (Landsat 4-5) images, which were selected to provide a full set of global coverage (circa 1990). All selected images were either cloud-free or contained minimal cloud cover. In addition, only images with a high quality ranking in regards to the possible presence of errors such as missing scans or saturated bands were selected.

陆地卫星TM正射校正镶嵌数据集（Landsat TM Orthorectified Mosaics）源自陆地卫星4号、5号搭载的TM传感器所获取的全球高质量、低云量正射校正影像集合。该数据集由美国国家航空航天局（NASA）商业遥感计划筛选并生成，作为NASA与商业遥感界合作项目的一部分，旨在为用户提供经过质量筛选、高分辨率的全球陆域覆盖卫星影像。本数据集由NASA通过与地球卫星公司（位于马里兰州罗克维尔）签订的合同，并结合NASA科学数据采购计划（Scientific Data Purchase program）汇编完成。

陆地卫星正射校正TM镶嵌数据集（Landsat Orthorectified TM Mosaics）源自约7461幅TM影像（对应陆地卫星4号、5号），这些影像经过筛选以实现完整的全球陆域覆盖（采集于约1990年）。所有入选影像均无云或仅含微量云量。此外，仅选取了在扫描缺失、波段饱和等潜在误差方面质量评级较高的影像。