Product Details
Learn more about the different data products Hydrosat provides.
Level-1 Imagery
The Level-1A data product is the least processed of the available imagery. It includes processing applied onboard the instrument, such as time delay integration and non-uniformity corrections, as well as co-registration of sensor bands and georegistration. The full swath data is provided to users in image space with no resampling. Coefficients needed to convert digital number (DN) values to radiance are available in metadata.
The Level-1B product includes clipping the VIRI data to the extent of the LIRI swath, generation of a cloud mask, and orthorectification.
L1 Product Granule Size
L1A VIRI: 122 km x 70 km
L1A LIRI: 70 km x 70 km
L1B: Combined 70 km x 70 km
L1 Pixel Size
L1A VIRI: 29.9 m
L1A LIRI: 68.8 m
L1B: 30 m
Resampling Method
Bilinear (L1B only)
Bit Depth
16-bit
Map Projection
L1A VIRI & LIRI: EPSG 4326 (RPCs included in metadata)
L1B: Universal Transverse Mercator (UTM)
No Data Value
0
Radiometric Rescaling
Per-band gain and offset for conversion from DN to radiance and at-sensor reflectance included in metadata
Level-1 Assets
Each STAC item includes several assets representing the individual data and metadata files associated with the scene. Items from different collections contain a different set of assets, as defined below.
Level-2 Imagery
The Level-2 product includes radiometric terrain corrections and conversion to surface reflectance (SR) and land surface temperature (LST).
L2 Product Granule Size
70 km x 70 km
L2 Pixel Size
30 m
Map Projection
UTM
Bit Depth
16-bit
No Data Value
0
Scaling Factor
LST, LST uncertainty, BT: 0.01
SR, emissivity: 0.0001
Level-2 Assets
Level-2 assets include per-band SR and LST COGs (and more).
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