Fire Information 
Event ID: Fire_Id
Fire Name (if known): Fire_Name
Date of Fire: F_Date
Type of Assessment: Assess_Type
Acres within Fire Perimeter: Fire_Acres

Sensor_Name Path and Row: Fire_Pr
Pre-Fire Sensor_Name Date/Scene ID: Pre_Sensor_Type; Pre_Sensor_Info
Post-Fire Sensor_Name Date/Scene ID: Post_Sensor_Type; Post_Sensor_Info
Perimeter-Fire Sensor_Name Date/Scene ID: Perimeter_Sensor_Type; Perimeter_Sensor_Info

Output Dataset Projection Albers Equal Area
Units: Meters
Datum: NAD83
Spheroid: GRS80
1st Standard Parallel: 29 30 00
2nd Standard Parallel: 45 30 00
Central Meridian: -96 00 00
Latitude of Origin: 23 00 00
False Northing: 0
False Easting: 0

Image Subset Corner Coordinates (center of pixel, projected meters) 
ULX: Fix_Ulx
ULY: Fix_Uly
LRX: Fix_Lrx
LRY: Fix_Lry
Rows: Fix_Rows
Columns: Fix_Cols
Pixel size: 30 meters 

Bounding Box 
North Latitude: Fix_Nlat (Nlat_Degrees_Minutes_Seconds)
South Latitude: Fix_Slat (Slat_Degrees_Minutes_Seconds)
East Longitude: Fix_Elon (Elon_Degrees_Minutes_Seconds)
West Longitude: Fix_Wlon (Wlon_Degrees_Minutes_Seconds)

Latitude and Longitude within Fire Perimeter 
Latitude: Fix_Centlat (Centlat_Degrees_Minutes_Seconds)
Longitude: Fix_Centlon (Centlon_Degrees_Minutes_Seconds) 

Fire Perimeter Generation Comments: Perim_comments

dNBR offset value used to calculate RdNBR: dnbr_offset
dNBR offset Standard Deviation: sd_offset

Burn severity thresholds 
No Data Threshold: No_Thresh
Increased Greenness: Increased_Thresh
Low Threshold: Low_Thresh
Moderate Threshold: Mod_Thresh
High Threshold: High_Thresh

Mapping comments: mapping_comments

    
    Process_Description: These data products are derived from Sensor_Name Thematic (Them_Statement) Mapper data. A pre-fire scene and a post-fire scene are analyzed to create a Differenced Normalized Burn Ratio (dNBR) image. The dNBR image portrays the variations of burn severity within the fire. The Sensor_Name images are terrain corrected and geometrically rectified to an Albers Conical Equal Area map projection. The images are further processed to convert bands 1-5 and 7 (for L5&L7&S2A&S2B, bands 1-7 for L8&L9) to at-satellite-reflectance. The Normalized Burn Ratio (NBR) is computed for each date of imagery using the following formula:
    
 L5&L7&S2A&S2B:       ((Band 4 - Band 7) / (Band 4 + Band 7)) x 1000 = NBR
 L8&L9:          ((Band 5 - Band 7) / (Band 5 + Band 8)) x 1000 = NBR
    
    The differenced NBR is computed by subtracting the post-fire NBR from the pre-fire NBR:
    
        PreNBR - PostNBR = dNBR
    
    Further processing is required to generate the 'Relativized' dNBR (RdNBR). The RdNBR takes into account pre fire conditions related to the amount of vegetation cover vs. bare soil. In one sense, an area of 25% vegetation cover that burns completely should be considered 'high severity' as would an area of 100% cover that burned completely. The dNBR does not allow that distinction. To calculate the RdNBR, the analyst must determine the 'dNBR offset value': the average dNBR value of a nearby area of unburned vegetation (similar to the vegetation that did burn). The RdNBR is calculated as follows:
    
        (dNBR - dNBROffset)/ (Square Root of Absolute Value(PreNBR/1000)) = RdNBR
    
    Higher dNBR and RdNBR values are correlated with more severe burns. The dNBR image is evaluated to determine the threshold value between burned and unburned areas. The perimeter of the fire is delineated using the dNBR and/or post-fire reflectance image. The dNBR image, the pre-fire and post-fire TM images, and a fire perimeter vector file are provided in digital format.