Fire Radiative Power (FRP)
The SLSTR Fire Radiative Power (FRP) is provided by the SL_2_FRP package in one measurement data file FRP_in.nc file.
The product is generated "globally", i.e. over land and marine areas.
The FRP_in.nc is composed by FRP_flags indexed on the 1km image grid and by a vector providing for each confirmed fire its characteristics.
Note that depending on the approach used to detect this fire (using thermal and/or MWIR radiometric measurements), a fire can be associated with FRP_MIR and/or FRP_SWIR.
| Descriptive Name | Fire Radiative Power |
| Variable Name | FRP |
| Product Level | 2 |
| Description | Fire Radiative Power values for each hotspot detected on the 1 km measurement grid. |
| Product Parameters | |
|---|---|
| Coverage | Global (over land and water) |
| Timeliness and Packaging | NRT: 3 min frame NTC: full orbit (pole to pole) |
| Units | MegaWatts |
| Format | 64 bit float |
| Appended Data | For each gridded pixel: Fire test summary flags. For each confirmed hotspot: Fire radiative power and its total uncertainty, TCWV above fire, transmittance, Projected area of detector IFOV on surface, glint angle, associated across and along track coordinates, time and geographical coordinates, fire detection confidence, hotspot classification code, background window size. |
| Additional Information | |
| Input Bands | Channels S6, S7 and S8 , i.e. 2.25, 3.7 and 10.85 μm |
| Ancillary and Auxiliary Data | meteorological annotations Cartesian and geodetic coordinates associated with the radiometric measurements and to the tie-points grid defined for SLSTR geometry information quality flags |
FRP summary flag word values
| Bit number |
Value | Text Code | Description |
|---|---|---|---|
| 0 | 1 | exception | L1b pixel radiance exception |
| 1 | 1 | l1b_water | L1b water surface classification |
| 2 | 1 | frp_water | Water detected by FRP tests |
| 3 | 1 | l1b_cloud | Cloud detected by L1b tests |
| 4 | 1 | bayesian_cloud | Cloud detected by Bayesian tests |
| 5 | 1 | frp_cloud | Cloud detected by FRP tests |
| 6 | 0 | night | Pixel is in day or night |
| 1 | day | ||
| 7 | 1 | sun_glint | Sun glint |
| 8 | 1 | spectral_filter | Potential fire identified by spectral test |
| 9 | 1 | spatial_filter | Potential fire identified by spatial test |
| 10 | 1 | absolute_threshold | Fire identified by absolute threshold test |
| 11 | 1 | background_characterisation | Potential fire successful background characterisation |
| 12 | 1 | contextual_threshold | Potential fire confirmed by contextual threshold test |
| 13 | 1 | desert_boundary | Potential fire rejected by desert boundary test |
| 14 | 0 | No Fire | Normal fire has BT <500K |
| 1 | Saturated fire | Saturation fire has BT >500K | |
| 15 | 0 | Low confidence fire | Low confidence (0-50%) |
| 1 | High confidence fire | High confidence (50-100%) | |