Product Content
The Landsat-8 30m HLS product consists of surface reflectance derived from all Landsat-8 L1T products. Products are gridded with the Sentinel-2 tiling scheme and include nadir-adjustment.
Values correspond to nadir-adjusted* Surface Reflectance (SR) and TOA apparent temperature.
(*) Nadir-view, constant sun angle depending on the center latitude of the tile.
Product specification
- Spatial: 30m
- Spectral: As input
- temporal: All Landsat-8 L1 products from T1/T2 in Collection-1
- Nadir-adjustment: Yes
Output Projection & Gridding
Product gridding is based on the Sentinel-2 tile (granules) scheme defined by ESA. Product are 109.80×109.80 km2 in UTM/WGS84 projection. They are identified by a Tile ID that start with a UTM zone and latitude band (e.g. Tile 18SUJ is located in UTM zone 18 and latitude band S). Each UTM zone and latitude band polygon is split into the 109.80×109.80 km2 tiles that slightly overlap. A table with each Tiles ID with coordinate of the upper-left pixel, tile size can be downloaded here.
Spatial resampling algorithm
OLI/TIRS 30m data are resampled using a cubic convolution method during gridding, to
account for coordinate difference between USGS Landsat WRS system and ESA Sentinel-2
tiling system (USGS places the pixel center at the coordinate origin of a UTM zone, but ESA places a pixel corner on the origin – half a pixel offset for 30m HLS; potentially two different UTM zones; relative error between the two systems).
File Naming
Each tile is stored in a single HDF file. File naming convention follows:
HLS.L30.<Tile_ID>.<year>.<doy>.v<version number>.hdf
SDS description
The table below gives a quick description of the layers included in the product.
Band Name | Data type | Scale | Unit | saturation flag | nadir adj. | Description | Spatial Res. |
|
1 | Coastal aerosol | int16 | 0.0001 | unitless | 12000 | yes | Nadir-adjusted Surface Reflectance |
30 |
2 | Blue | int16 | 0.0001 | unitless | 12000 | |||
3 | Green | int16 | 0.0001 | unitless | 12000 | |||
4 | Red | int16 | 0.0001 | unitless | 12000 | |||
5 | NIR | int16 | 0.0001 | unitless | 12000 | |||
6 | SWIR 1 | int16 | 0.0001 | unitless | 12000 | |||
7 | SWIR 2 | int16 | 0.0001 | unitless | 12000 | |||
8 | TIRS 10 | int16 | 0.01 | Celsius | ?? | TOA BT | ||
12 | QA | uint8 | refer to the QA table for bit information |