Agricultural fields over northeastern Iowa using the HLSS30 product from July 11, 2020.
The Harmonized Landsat and Sentinel-2 (HLS) project provides consistent surface reflectance data from the Operational Land Imager (OLI) aboard the joint NASA/USGS Landsat 8 satellite and the Multi-Spectral Instrument (MSI) aboard the European Union’s Copernicus Sentinel-2A and Sentinel-2B satellites. The combined measurement enables global observations of the land every 2-3 days at 30 meter (m) spatial resolution. The HLS project uses a set of algorithms to obtain seamless products from OLI and MSI that include atmospheric correction, cloud and cloud-shadow masking, spatial co-registration and common gridding, illumination and view angle normalization, and spectral bandpass adjustment.
The HLSS30 product provides 30 m Nadir Bidirectional Reflectance Distribution Function (BRDF)-Adjusted Reflectance (NBAR) and is derived from Sentinel-2A and Sentinel-2B MSI data products. The HLSS30 and HLSL30 products are gridded to the same resolution and Military Grid Reference System (MGRS) tiling system, and thus are “stackable” for time series analysis.
The HLSS30 product is provided in Cloud Optimized GeoTIFF (COG) format, and each band is distributed as a separate COG. There are 13 bands included in the HLSS30 product along with four angle bands and a quality assessment (QA) band. For a more detailed description of the individual bands provided in the HLSS30 product, please see the User Guide.
Provisional HLS data have not been validated for their science quality and should not be used in science research or applications. If you are interested in exploring these provisional datasets please download the data from NASA's Earthdata Search. If you have any feedback or questions on the data please contact email@example.com or join our HLS conversion on the Earthdata Forum.
|File Size||~20 MB|
|Temporal Extent||2014-04-03 to Present|
|Spatial Extent||Global (Non-Antarctic)|
|Coordinate System||Universal Transverse Mercator (UTM)|
|Datum||World Geodetic System (WGS84)|
|Geographic Dimensions||10980 km x 10980 km|
|Number of Science Dataset (SDS) Layers||18|
|Columns/Rows||3660 x 3660|
|Pixel Size||30 m|
|SDS Name||Description||Units||Data Type||Fill Value||No Data Value||Valid Range||Scale Factor|
|Band 1||Coastal Aerosol||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 2||Blue||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 3||Green||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 4||Red||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 5||Red Edge1||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 6||Red Edge2||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 7||Red Edge3||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 8||NIR Broad||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 8A||NIR Narrow||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 9||Water Vapor||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 10||Cirrus||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 11||SWIR1||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Band 12||SWIR2||N/A||16-bit signed integer||-9999||N/A||N/A||0.0001|
|Fmask||Quality Bits||Bit Field||8-bit unsigned integer||255||N/A||N/A||N/A|
|SZA||Sun Zenith Angle||Degree||16-bit unsigned integer||40000||N/A||N/A||0.01|
|SAA||Sun Azimuth Angle||Degree||16-bit unsigned integer||40000||N/A||N/A||0.01|
|VZA||View Zenith Angle||Degree||16-bit unsigned integer||40000||N/A||N/A||0.01|
|VAA||View Azimuth Angle||Degree||16-bit unsigned integer||40000||N/A||N/A||0.01|
Additional information related to cloud and aerosol quality along with QA mappings are provided under section 6.5 of the User Guide.
Interruptions in data service occurred during a restaging of backlogged data between June 1 and June 15, 2021 for both HLSS30 and HLSL30 version 1.5 data products. During this time period increased errors in the processing workflow resulted in a significant number of data ingestion failures and thus, significant gaps in data availability. Given the pending release of the version 2.0, science quality HLS products, these missing data will not be filled for version 1.5. Users of the provisional version 1.5 products should be aware of the significant data gap in this two week window. The version 2.0 products will incorporate these data back into the archive. If you have any feedback or questions on the data please contact Customer Services or join our HLS conversion on the Earthdata Forum.