Units in IFTDSS and Downloads
Tables below list outputs and units.
Exposure Analysis
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 # | 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/m^{3} | kg/m^{3} | kg/m^{3} * 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
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
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/ft^{2} | BTU/ft^{2} | kJ/m^{2} |
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 Burned^{A} | 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/m^{2} |
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
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 Grid^{A, 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 Spread^{A, 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 Intensity^{A, 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 # | 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.