Outputs
Naming convention
FILDA-2 output the fire detection into two resolutions. The naming convention if the FILDA-2 output is:
SensorProductSequenceResolution.AYearDoy.Overpass.Collection.ProcessTime.nc
- Sensor:
- VNP: Suomi-NPP VIIRS
- VJ1: JPSS-1(NOAA-20) VIIRS
- ProductSequence: FILDA-2 is the 47th product of the VIIRS product suit
- Resolution:
- MOD: Moderate resolution output, 750 m
- IMG: Imagery resolution output, 375 m
- AYearDoy:
- A: Designed prefix
- Year: Year in four digits
- Doy: Day of year, 0 ~ 356 (366 for leap year)
- Overpass: Overpass time of the satellite observation in UTC
- Collection: Collection of the VIIRS L2 data
- ProcessTime: output generating time, in yyyymmddHHMMSS(year, month, day, hour, minute, second)
VNP47IMG.A2021182.0006.002.20210701035436.nc
indicates, this file is FILDA-2 fire MCE product in I-band resolution. The observational time of the file is UTC0006 on July 1st, 2021. It is the second collection of the VIIRS product.
List of variables
Detail information of the I-band science data set (SDS) can be found in table 2.
| Dataset | Description | Unit |
|---|---|---|
| DNB_observations | DNB radiance of fire pixel | nW/sr/m^2 |
| FP_MCE | Modified combustion efficiency | None |
| FP_VEF | Visible energy fraction | None |
| FP_Status | Fire status | None |
| FP_Num_Fire | Number of I band fires within a same M band host pixel | None |
| FP_I04_Mean | I04 (3.74 um) brightness temperature of background | Kelvin |
| FP_I05_Mean | I05 (11.45 um) brightness temperature of background | Kelvin |
| FP_BTD_Mean | Mean background brightness temperature difference (I04 - I05) | Kelvin |
| FP_WinSize | background window size for fire detection | None |
| FP_M13_Rad | M13 (4.05 um) radiance for FRP calculation | W/m^2/sr/um |
| FP_M13_Mean | Backrgound mean M13 (4.05 um) radiance for FRP calculation | W/m^2/sr/um |
| FP_M13_MAD | Backrgound median absolute deviation of M13 (4.05 um) radiance | W/m^2/sr/um |
| FP_M13_Num | Number of background M13 (4.05 um) pixel for FRP calculation | None |
| FP_M13_WinSize | M13 (4.05 um) spatial window size for FRP calculation | None |
| FP_Power_QA | Quality flag for fire radiative power calculation | None |
| FP_M07_Rad | M07 (0.865 um) radiance of the fire pixel | W/m^2/sr/um |
| FP_M07_Mean | Backrgound mean M07 (0.865 um) radiance | W/m^2/sr/um |
| FP_M07_Num | Number of background M07 (0.865 um) pixel | None |
| FP_M08_Rad | M08 (1.24 um) radiance of the fire pixel | W/m^2/sr/um |
| FP_M08_Mean | Backrgound mean M08 (1.24 um) radiance | W/m^2/sr/um |
| FP_M08_Num | Number of background M08 (1.24 um) pixel | None |
| FP_M10_Rad | M10 (1.61 um) radiance of the fire pixel | W/m^2/sr/um |
| FP_M10_Mean | Backrgound mean M10 (1.61 um) radiance | W/m^2/sr/um |
| FP_M10_Num | Number of background M10 (1.61 um) pixel | None |
| FP_M11_Rad | M11 (2.25 um) radiance of the fire pixel | W/m^2/sr/um |
| FP_M11_Mean | Backrgound mean M11 (2.25 um) radiance | W/m^2/sr/um |
| FP_M11_Num | Number of background M11 (2.25 um) pixel | None |
| FP_M14_Rad | M14 (8.55 um) radiance of the fire pixel | W/m^2/sr/um |
| FP_M14_Mean | Backrgound mean M14 (8.55 um) radiance | W/m^2/sr/um |
| FP_M14_Num | Number of background M14 (8.55 um) pixel | None |
| FP_M15_Rad | M15 (10.76 um) radiance of the fire pixel | W/m^2/sr/um |
| FP_M15_Mean | Backrgound mean M15 (10.76 um) radiance | W/m^2/sr/um |
| FP_M15_Num | Number of background M15 (10.76 um) pixel | None |
| FP_M16_Rad | M16 (12.00 um) radiance of the fire pixel | W/m^2/sr/um |
| FP_M16_Mean | Backrgound mean M16 (12.00 um) radiance | W/m^2/sr/um |
| FP_M16_Num | Number of background M16 (12.00 um) pixel | None |
| FP_BG_Temp | Estimated background temperatue | Kelvin |
| FP_Fire_Temp | Estimated fire temperatue | Kelvin |
| FP_Fire_Frac | Estimated fire fraction | None |
| FP_Opt_Status | Optimazation status | None |
| FP_DNB_POS | DNB abnormal possibility | None |
| FP_Power | Fire radiative power | MW |
| FP_VE | Visible energy | MW |
| FP_Area | Pixel area | m^2 |
| FP_Line | Granule line of fire pixel | None |
| FP_Sample | Granule sample of fire pixel | None |
| FP_Latitude | Latitude of fire pixel | degree |
| FP_Longitude | Longitude of fire pixel | degree |
| FP_IMG_BTD | Brightness temperature of fire pixel (I04 - I05) | Kelvin |
| FP_I04_BT | I04 (3.74 um) brightness temperature of fire pixel | Kelvin |
| FP_I05_BT | I05 (11.45 um) brightness temperature of fire pixel | Kelvin |
| FP_CM | Cloud Mask | None |
| FP_I04_MAD | Background I04 (3.74 um) brightness temperature mean absolute deviation | Kelvin |
| FP_I05_MAD | Background I05 (11.45 um) brightness temperature mean absolute deviation | Kelvin |
| FP_BTD_MAD | Background brightness temperature difference mean absolute deviation (I04 - I05) | Kelvin |
| FP_Bowtie | Fraction of bowtie effect | None |
| Sensor_Zenith | View zenith angle | degree |
| Fire_mask* | Fire_mask | None |
| FP_Land_Type** | MODIS Land cover product MCD12C1 | None |
| FP_Gas_Flaring*** | Gas Flaring flag | None |
| FP_Peatland**** | Peatland flag | None |
| FP_Peatfrac***** | Peatland fraction | None |
| FP_AdjWater | Number of adjacent water pixels | None |
| FP_AdjCloud | Number of adjacent cloud pixels | None |
* Fire mask is a higher-level summary of the FILD fire product. It is a 2D flags containing water, cloud, etc. information for the whole swath, refer to Table 2 for detail class information of the fire mask
** Land surface type is adopted from MODIS MCD12C1, refer to Table 3 for detail class information of the land surface type
*** Gas flaring database is a rasterized dataset converted from the point DNB gas flaring mapping. 0 indicates no gas flaring exits, 1 indicates gas flaring exits in the fire pixel. Visit NOAA GAS Flaring
**** Peatland is a rasterized dataset converted from the vector PEATMAP dataset, it is a indicator of the existence of peat land within the current pixel. 0 indicates no peatland exits, 1 indicates peatland exits in the fire pixel. Visit PEATMAP
**** Peatland fraction is the fraction of the peat land area to the total area of the original PEATMAP dataset. NaN indicates no data provided in the PEATMAP.
Fire mask
The 'fire mask' Scientific Data Set (SDS) is an 8-bit, two-dimensional integer array that corresponds to the dimensions of the input L1B data array. This array serves as a refined representation of the status of the standard 6-minute level-1b radiance data. Pixels within the array are classified into distinct categories: land, water, cloud, and fire. Additional classifications are provided for pixels that remain unprocessed, are of undetermined classification ('unclassified'), or are identified as affected by bowtie distortions through enhanced bowtie identification processes. The 'unclassified' label denotes instances where a lack of background statistics hinders precise pixel classification. Fire pixels further receive a confidence rating of 'low,' 'nominal,' or 'high', each indicative of the conditions during detection.
| Pixel Class | Definition |
|---|---|
| 0 | Not Processed |
| 1 | Bow-tie deletion |
| 2 | Sun Glint |
| 3 | Water |
| 4 | Cloud |
| 5 | Land |
| 6 | Unclassified |
| 7 | Low confidence fire pixel |
| 8 | Nominal confidence fire pixel |
| 9 | High confidence fire pixel |
Land surface type category
| Name | Value | Description |
|---|---|---|
| Evergreen Needleleaf Forests | 1 | Dominated by evergreen conifer trees (canopy >2m). Tree cover >60%. |
| Evergreen Broadleaf Forests | 2 | Dominated by evergreen broadleaf and palmate trees (canopy >2m). Tree cover >60%. |
| Deciduous Needleleaf Forests | 3 | Dominated by deciduous needleleaf (larch) trees (canopy >2m). Tree cover >60%. |
| Deciduous Broadleaf Forests | 4 | Dominated by deciduous broadleaf trees (canopy >2m). Tree cover >60%. |
| Mixed Forests | 5 | Dominated by neither deciduous nor evergreen (40-60% of each) tree type (canopy >2m). Tree cover >60%. |
| Closed Shrublands | 6 | Dominated by woody perennials (1-2m height) >60% cover. |
| Open Shrublands | 7 | Dominated by woody perennials (1-2m height) 10-60% cover. |
| Woody Savannas | 8 | Tree cover 30-60% (canopy >2m). |
| Savannas | 9 | Tree cover 10-30% (canopy >2m). |
| Grasslands | 10 | Dominated by herbaceous annuals (<2m). |
| Permanent Wetlands | 11 | Permanently inundated lands with 30-60% water cover and >10% vegetated cover. |
| Croplands | 12 | At least 60% of area is cultivated cropland. |
| Urban and Built-up Lands | 13 | At least 30% impervious surface area including building materials, asphalt, and vehicles. |
| Cropland/Natural Vegetation Mosaics | 14 | Mosaics of small-scale cultivation 40-60% with natural tree, shrub, or herbaceous vegetation. |
| Permanent Snow and Ice | 15 | At least 60% of area is covered by snow and ice for at least 10 months of the year. |
| Barren | 16 | At least 60% of area is non-vegetated barren (sand, rock, soil) areas with less than 10% vegetation. |
| Water Bodies | 17 | At least 60% of area is covered by permanent water bodies. |
| Unclassified | 255 | Has not received a map label because of missing inputs. |