Units in IFTDSS and Downloads

Tables below list outputs and units.

Exposure Analysis

Band number and units for outputs within IFTDSS and contained in output files.
Band # Output Brief Description Map Studio Units Report Units Download Units
1 Burn Probability A B The likelihood that a fire will burn a given point on the landscape (expressed as a value between 0 and 1). See Burn Probability for more detail. proportion proportion proportion
2 Conditional Flame Length A B The mean flame length of all the fires that burn a given point on the landscape. See Conditional Flame Length for more detail. feet feet feet
3 Integrated Hazard A B The combination of Burn Probability and Conditional Flame Length ranging from lowest probability/lowest conditional flame lengths to highest probability/highest conditional flame lengths. See Integrated Hazard for more detail. unitless unitless unitless
4 Sub-HVRA 1 Rasterized version of Sub-HVRA, where the band name is <Primary HVRA Category>-<Sub-HVRA Short Name>. Where the Sub-HVRA is present the value is 1, where it is absent the values is NoData. See Exposure Analysis Technical Documentation for more detail. unitless unitless unitless
n Sub-HVRA n... Each subsequent Sub-HVRA you use in the analysis will have its own band, there can be up to 100 Sub-HVRAs total within a GeoTIFF. unitless unitless unitless

A Non-burnable pixels are indicated with a value of -1.

B Burnable, but not burned pixels, are indicated with a value of 0.

Landscapes

Band number, name, and units for IFTDSS landscapes.
Band # Band Name Map Studio Units Report Units Download Units
1 Elevation feet feet meters
2 Slope degrees degrees degrees
3 Aspect degrees degrees degrees
4 Fuel Model categorical categorical categorical
5 Canopy Cover % % %
6 Stand Height meters meters meters * 10
7 Canopy Base Height meters meters meters * 10
8 Canopy Bulk Density kg/m3 kg/m3 kg/m3 * 100
9 EVT (Existing Vegetation Type) N/A N/A categorical A
10 EVC (Existing Vegetation Cover) N/A N/A categorical A
11 EVH (Existing Vegetation Height) N/A N/A categorical A
12 Zone (LANDFIRE Map Zone) N/A N/A categorical

A EVT, EVC, and EVH GeoTIFF units are continuous for LANDFIRE 2016 Remap data.

 

Landscape Burn Probability

Outputs and units used in IFTDSS Map Studio, summary reports, and output files exported from IFTDSS.
Output Brief Description Map Studio Units Report Units Download Units
Burn Probability The likelihood that a fire will burn a given point on the landscape (expressed as a value between 0 and 1). See Burn Probability for more detail. proportion proportion proportion
Conditional Flame Length The mean flame length of all the fires that burn a given point on the landscape. See Conditional Flame Length for more detail. feet feet feet
Integrated Hazard The combination of Burn Probability and Conditional Flame Length class ranging from lowest probability/lowest conditional flame lengths to highest probability/highest conditional flame lengths. See Integrated Hazard for more detail. categorical categorical categorical
Proportion of Flame Lengths 0-2 ft The probability of fire burning with a flame length between >0 and 2 ft (expressed as a value between 0 and 1). See Flame Length Probability for more detail. N/A N/A proportion
Proportion of Flame Lengths 2-4 ft The probability of fire burning with a flame length between >2 and 4 ft (expressed as a value between 0 and 1). See Flame Length Probability for more detail. N/A N/A proportion
Proportion of Flame Lengths 4-6 ft The probability of fire burning with a flame length between >4 and 6 ft (expressed as a value between 0 and 1). See Flame Length Probability for more detail. N/A N/A proportion
Proportion of Flame Lengths 6-8 ft The probability of fire burning with a flame length between >6 and 8 ft (expressed as a value between 0 and 1). See Flame Length Probability for more detail. N/A N/A proportion
Proportion of Flame Lengths 8-12 ft The probability of fire burning with a flame length between >8 and 12 ft (expressed as a value between 0 and 1). See Flame Length Probability for more detail. N/A N/A proportion
Proportion of Flame Lengths >12 ft The probability of fire burning with a flame length between >12 ft (expressed as a value between 0 and 1). See Flame Length Probability for more detail. N/A N/A proportion
1-hr Fuel Moisture Moisture content of 1-hour fuel (dead woody fuel 0 to ¼ inch or 0 to 6.4 mm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. See Fuel Moisture for more detail. percent N/A percent
10-hr Fuel Moisture Moisture content of 10-hour fuel (dead woody fuel ¼ to 1 inch or 0.6 to 2.5 cm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. See Fuel Moisture for more detail. percent N/A percent
100-hr Fuel Moisture Moisture content of 100-hour fuel (dead woody fuel 1 to 3 inches or 2.5 to 7.6 cm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. See Fuel Moisture. for more detail. percent N/A percent
Midflame Wind Speed Wind velocity at the midflame height. Calculated using wind adjustment factors based on stand height and canopy cover and the Wind Speed. See Midflame Wind Speed for more detail. mph N/A mph
20 Ft Wind Speed Wind velocity measured 20 feet (6 m) above the top of the tree or shrub canopy, or above the ground if canopy is absent. N/A N/A mph
20 Ft Wind Direction Wind direction is the direction from which the wind is blowing, specified in degrees increasing clockwise from north (which is zero degrees), Uphill or Downhill. N/A N/A degrees

 

Landscape Fire Behavior

File type and naming conventions for each output file.
Output Brief Description

Map Studio Units

 Report Units Download Units
Flame Length The flame length of a spreading surface fire within the flaming front is measured from midway in the active flaming combustion zone to the average tip of the flames. feet feet meters
Rate of Spread The relative activity of a fire in extending its horizontal dimensions. It is expressed as rate of forward spread of the fire front. chains/hr chains/hr meters/min
Fireline Intensity The heat energy released per unit time from a one-foot-wide (or one-meter-wide) section of the fuel bed extending from the front to the rear of the flaming zone. BTU/ft-sec BTU/ft-sec kW/m
Heat per Unit Area Heat energy release per unit area (square foot or square meter) within the flaming front of the surface fuel. BTU/ft2 BTU/ft2 kJ/m2
Crown Fire Activity Fire activity in the forest or shrub canopy. Characterized as surface fire, passive crown fire (torching), or active crown fire. class class class
Midflame Wind Speed Wind velocity at the midflame height. Calculated using wind adjustment factors based on stand height and canopy cover and the Wind Speed. mph N/A mph
Horizontal Movement Rate The rate of fire spread (slope basis), transformed to a horizontal projection. N/A N/A meters/min
Maximum Spread Direction Direction of maximum spread in degrees. degrees N/A degrees
Maximum Spot Direction Direction of maximum spotting, the direction the spot was lofted from, NOT the direction the spot is coming from. N/A N/A degrees
Maximum Spot Distance Maximum spot distance in meters. N/A N/A meters
Crown Fraction BurnedA A fraction between 0 and 1 indicating the severity of a crown fire. 0.0 indicates a surface fire while 1.0 represents an active crown fire. Intermediate values represent a scaled value of passive crown fire severity. N/A N/A proportion
20 Ft Wind Direction B Wind direction is the direction from which the wind is blowing, specified in degrees increasing clockwise from north (which is zero degrees), Uphill or Downhill. N/A N/A degrees
20 Ft Wind Speed Wind velocity measured 20 feet (6 m) above the top of the tree or shrub canopy, or above the ground if canopy is absent. N/A N/A mph
Solar Radiation The solar radiation of each cell for the ending time of the optional fuel moisture conditioning period, only available when fuel conditioning was used. N/A N/A W/m2
1-hr Fuel Moisture A Moisture content of 1-hour fuel (dead woody fuel 0 to ¼ inch or 0 to 6.4 mm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. proportion N/A proportion
10-hr Fuel Moisture A Moisture content of 10-hour fuel (dead woody fuel ¼ to 1 inch or 0.6 to 2.5 cm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. proportion N/A proportion
100-hr Fuel Moisture A Moisture content of 100-hour fuel (dead woody fuel 1 to 3 inches or 2.5 to 7.6 cm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. proportion N/A proportion
1000-hr Fuel Moisture A,C Moisture content of 1000-hour fuel (dead woody fuel over 3 inches or 7.6 cm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. N/A N/A proportion

A GeoTIFF values for non-burnable pixels are 0.000000 unless the GeoTIFF download was request prior to 6/24/19.

B If Uphill or Downhill wind direction was selected during the model run, the wind direction will be displayed on the GeoTIFF raster grid as -1 for uphill winds, -2 for downhill winds.

C 1000 Hour fuel moisture will always be equal to 100 Hour fuel moisture in the GeoTIFF download.

 

MTT Fire Spread

MTT Output descriptions.

Output

Description

Map Studio - Units Report - Units Download - Units
MTT Major Paths The major flow paths show the most significant fire spread pathways. See the Flow Path topic for more details. unitless unitless unitless
MTT Arrival Time Contour A vector representation of the MTT Arrival Time grid representing individual burn periods. See the Arrival Time topic for more details. burn period N/A burn period
MTT Ignition Grid The raster interpretation of the ignition and barrier vectors used by the MTT model. See the MTT Ignitions topic for more details. unitless N/A unitless
MTT Arrival Time GridA, B The time required for fire to travel from its ignition source to a particular cell. See the Arrival Time topic for more details. burn period burn period minutes
MTT Rate of SpreadA, B Spread rate of the fire as it encountered each cell along the minimum travel time path. See the Rate of Spread topic for more details. chains/hr chains/hr meters/min
MTT Fireline IntensityA, B Fireline intensity of each cell burned by the fire as it follows the minimum travel time path. See the Fireline Intensity topic for more details. BTU/ft-sec BTU/ft-sec kW/m
MTT Ember Landing Locations Ember landing locations. See the MTT Embers topic for more details. N/A N/A unitless
Midflame Wind Speed C Wind velocity at the midflame height. Calculated using wind adjustment factors based on stand height and canopy cover and the Wind Speed. mph N/A mph
Wind Speed Wind velocity measured 20 feet (6 m) above the top of the tree or shrub canopy, or above the ground if canopy is absent. N/A N/A mph
Wind Direction Wind direction is the direction from which the wind is blowing, specified in degrees increasing clockwise from north (which is zero degrees), Uphill or Downhill. Measured 20 feet (6 m) above the top of the tree or shrub canopy, or above the ground if canopy is absent. N/A N/A degrees
1 Hr Fuel Moisture A Moisture content of 1-hour fuel (dead woody fuel 0 to ¼ inch or 0 to 6.4 mm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. See the Fuel Moisture topic for more details. percent N/A proportion
10 Hr Fuel Moisture A Moisture content of 10-hour fuel (dead woody fuel ¼ to 1 inch or 0.6 to 2.5 cm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. See the Fuel Moisture topic for more details. percent N/A proportion
100 Hr Fuel Moisture A Moisture content of 100-hour fuel (dead woody fuel 1 to 3 inches or 2.5 to 7.6 cm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. See the Fuel Moisture topic for more details. percent N/A proportion

A GeoTIFF values for non-burnable pixels are -1.

B GeoTIFF values for burnable but not burned pixels are 0.

C GeoTIFF values for non-burnable pixels are 0.

 

Quantitative Wildfire Risk Analysis

Band number and units for each landscape feature.
Band # Band Name Brief Description Units in Map Studio Units - GeoTIFF Units - IFTDSS (Report)
1 Conditional Weighted NVC A The sum-product of value change (to one or more resources or assets) over a range of flame lengths. See the Conditional Weighted NVC topic for more detail. unitless unitless unitless
2 Expected Weighted NVC A Burn Probability times Conditional Weighted NVC. See the Expected Weighted NVC topic for more detail. unitless unitless unitless
3 Conditional Weighted NVC Classified Categorical version of the Conditional Weighted NVC output to enable mapping in a GIS to match Map Studio. categorical categorical categorical
4 Expected Weighted NVC Classified Categorical version of the Expected Weighted NVC output to enable mapping in a GIS to match Map Studio. categorical categorical categorical
5 Burn Probability A, B The likelihood that a fire will burn a given point on the landscape (expressed as a value between 0 and 1). See the Burn Probability topic for more detail. proportion proportion proportion
6 Proportion of Flame Lengths 0-2 ft A, B The probability of fire burning with a flame length between >0 and 2 ft (expressed as a value between 0 and 1). See the Proportion of Flame Lengths topic for more detail. proportion proportion proportion
7 Proportion of Flame Lengths 2-4 ft A, B The probability of fire burning with a flame length between >2 and 4 ft (expressed as a value between 0 and 1). See the Proportion of Flame Lengths topic for more detail. proportion proportion proportion
8 Proportion of Flame Lengths 4-6 ft A, B The probability of fire burning with a flame length between >4 and 6 ft (expressed as a value between 0 and 1). See the Proportion of Flame Lengths topic for more detail. proportion proportion proportion
9 Proportion of Flame Lengths 6-8 ft A, B The probability of fire burning with a flame length between >6 and 8 ft (expressed as a value between 0 and 1). See the Proportion of Flame Lengths topic for more detail. proportion proportion proportion
10 Proportion of Flame Lengths 8-12 ft A, B The probability of fire burning with a flame length between >8 and 12 ft (expressed as a value between 0 and 1). See the Proportion of Flame Lengths topic for more detail. proportion proportion proportion
11 Proportion of Flame Lengths >12 ft A, B The probability of fire burning with a flame length 12 ft (expressed as a value between 0 and 1). See the Proportion of Flame Lengths topic for more detail. proportion proportion proportion
12 Sub-HVRA 1 The rasterized version of the presence of a Sub-HVRA at the same resolution of the Landscape Burn Probability outputs. See the Exposure Analysis Technical Documentation for more detail. unitless unitless unitless
13 Sub-HVRA n... Each subsequent Sub-HVRA you use in the analysis will have its own band, there can be up to 100 Sub-HVRAs total within a GeoTIFF. unitless unitless unitless

A Non-burnable pixels are indicated with a value of -1.

B Burnable but not burned pixels are indicated with a value of 0.