BOREAS LANDSAT TM LEVEL-3A IMAGERY: SCALED AT-SENSOR RADIANCE IN BSQ FORMAT

For BOREAS, the level-3a Landsat TM data, along with the other remotely sensed images, were collected in order to provide spatially extensive information over the primary study areas. This information includes radiant energy, detailed land cover, and biophysical parameter maps such as FPAR and LAI. Although very similar in content to the level-3s Landsat TM products, the level-3a images were created to provide users with a more usable BSQ format and to provide information that permitted direct determination of per-pixel latitude and longitude coordinates. Geographically, the level-3a images cover the BOREAS NSA and SSA. Temporally, the images cover the period of 22-Jun-1984 to 30-Jul-1996. The images are available in binary, image-format files. Companion files include (1) an image inventory listing to inform users of the images that are available and (2) example thumbnail images that may be viewed and the image data files downloaded using a convenient viewer utility.

针对BOREAS项目，研究人员收集了三级a类陆地卫星专题制图仪（Landsat TM）数据及其他遥感影像，旨在为主要研究区域提供空间覆盖范围广泛的信息。此类信息涵盖辐射能量、详细土地覆盖类型，以及光合有效辐射吸收比率（FPAR）、叶面积指数（LAI）等生物物理参数分布图。尽管其内容与三级s类（level-3s）陆地卫星专题制图仪产品高度相似，但三级a类影像的制作目标是为用户提供可用性更强的波段顺序（BSQ）格式数据，并支持直接获取每像素的经纬度坐标信息。在地理覆盖范围上，三级a类影像涵盖BOREAS的北部研究区（NSA）与南部研究区（SSA）；在时间跨度上，这批影像的覆盖时段为1984年6月22日至1996年7月30日。该影像以二进制图像格式文件提供。配套文件包括：(1) 影像清单列表，用于告知用户可获取的影像资源；(2) 示例缩略图，用户可通过便捷的查看工具浏览该缩略图并下载影像数据文件。