统一化陆地卫星与哨兵-2号（Harmonized Landsat Sentinel-2, HLS）第2.0版提供来自美国国家航空航天局（NASA）/美国地质调查局（USGS）联合运行的陆地卫星8号（Landsat 8）与陆地卫星9号（Landsat 9）所搭载的业务陆地成像仪（Operational Land Imager, OLI），以及欧洲航天局（European Space Agency, ESA）哨兵-2A（Sentinel-2A）、哨兵-2B（Sentinel-2B）和哨兵-2C（Sentinel-2C）卫星所搭载的多光谱仪器（Multi-Spectral Instrument, MSI）的一致地表反射率（Surface Reflectance, SR）与大气层顶（Top of Atmosphere, TOA）亮度数据。该融合观测能力支持以30米（m）空间分辨率实现全球陆地每2–3天一次的重复观测。HLS-S30与HLS-L30产品采用相同的空间分辨率与军事网格参考系统（Military Grid Reference System, MGRS）分幅体系，可直接叠加用于时间序列分析。本数据集以云优化GeoTIFF格式发布。HLS v2.0数据由NASA马歇尔太空飞行中心（Marshall Space Flight Center）的IMPACT团队生成，产品延迟为1.7天，即从卫星过境至数据在NASA陆地过程分布式主动存档中心（Land Processes Distributed Active Archive Center, LP DAAC）正式发布所需时间。更多信息请参见LP DAAC发布的[HLS概述](https://lpdaac.usgs.gov/data/get-started-data/collection-overview/missions/harmonized-landsat-sentinel-2-hls-overview/)。本合集仅包含源自哨兵-2A、哨兵-2B与哨兵-2C的HLS数据；源自陆地卫星的HLS数据收录于独立合集中。
Harmonized Landsat Sentinel-2 (HLS) Version 2.0 provides consistent surface reflectance (SR) and top of atmosphere (TOA) brightness data from the Operational Land Imager (OLI) aboard the joint NASA/USGS Landsat 8 and Landsat 9 satellites and the Multi-Spectral Instrument (MSI) aboard the ESA (European Space Agency) Sentinel-2A, Sentinel-2B, and Sentinel-2C satellites. The combined measurement enables global observations of the land every 2-3 days at 30 meter (m) spatial resolution. The HLS-S30 and HLS-L30 products are gridded to the same resolution and Military Grid Reference System (MGRS) tiling system and are "stackable" for time series analysis. This dataset is in the form of cloud-optimized GeoTIFFs. The HLS v2.0 data is generated by NASA's IMPACT team at Marshall Space Flight Center. The product latency is 1.7 days, from the satellite overpass to the HLS data availability at NASA's Land Processes Distributed Active Archive Center (LP DAAC). For more information see LP DAAC's [HLS Overview](https://lpdaac.usgs.gov/data/get-started-data/collection-overview/missions/harmonized-landsat-sentinel-2-hls-overview/). This collection contains HLS data collected from Sentinel-2A, Sentinel-2B, and Sentinel-2C. HLS data generated from Landsat can be found in a separate collection.