Identification Information
    Citation
        Originator: USDA Forest Service, Geospatial Technology and Applications Center, BAER Imagery Support Program
        Publication Date: 2018-08-22
        Title: Burned Area Reflectance Classification (BARC) Data Bundle for the WEST GUARD  Fire occurring on the San Juan National Forest - 2018
        Publication Information
            Publication Place: Salt Lake City, Utah, USA
            Publisher: USDA Forest Service
        Geospatial Data Presentation Form: raster digital data
        Online Linkage: https://fsapps.nwcg.gov/afm/baer/download.php?year=2018
    Description
        Abstract: These data products are preliminary burn severity assessments derived from Landsat 8 OLI and Landsat 8 OLI data. The pre-fire and post-fire subsets included were used to create a differenced Normalized Burn Ratio (dNBR) image. The dNBR image attempts to portray the variation of burn severity within a fire. The severity ratings are influenced by the effects to the canopy.  The severity rating is based upon a composite of the severity to the understory (grass, shrub layers), midstory trees and overstory trees. Because there is often a strong correlation between canopy consumption and soil effects, this algorithm works in many cases for BAER teams whose objective is a soil burn severity assessment.  It is not, however, appropriate in all ecosystems or fires. It is expected that BAER teams will adjust the thresholds to match field observations to produce a soil burn severity.
        Purpose: These data were created by the USDA Forest Service Geospatial Technology and Applications Center (GTAC) to support Burned Area Emergency Response (BAER) teams.    
    Supplemental Information
        Fire Name: WEST GUARD 
        Agency: USDA Forest Service
        Land Management Unit: San Juan National Forest
        Type of assessment: Emergency
        Fire size (as mapped): 1573 acres
        Pre-Fire Imagery Date and Path/Row: 2018-07-04; 035/034
        Post-Fire Imagery Date and Path/Row: 2018-08-12; 036/034
        Output Dataset Projection: USA_Contiguous_Albers_Equal_Area_Conic_USGS_version
        Datum: D_North_American_1983
        Spheroid Name: GRS_1980
        Mapping Comments: None    
    Product List
        co3778110864120180722_20180704_l8_refl.tif = Pre-Fire Landsat 8 OLI reflectance at sensor data subset, scaled by 400 and converted to integer (band order (1-8): B, G, R, NIR, SWIR-1, SWIR-2, Coastal Blue, Cirrus). For best viewing set RGB to bands 6, 4, 3.
        co3778110864120180722_20180812_l8_refl.tif = Post-Fire Landsat 8 OLI reflectance at sensor data subset, scaled by 400 and converted to integer (band order (1-8): B, G, R, NIR, SWIR-1, SWIR-2, Coastal Blue, Cirrus). For best viewing set RGB to bands 6, 4, 3. 
        co3778110864120180722_20180704_20180812_dNBR.tif = Continuous dNBR product scaled by 1000; theoretical range of values is -2000 to 2000
    
    Time Period of Content
        Multiple Dates/Times
            Single Date/Time
                Calendar Date: 2018-07-04 (pre-fire image)
            Single Date/Time
                Calendar Date: 2018-08-12 (post-fire image)
        Currentness Reference: Severity data correspond to the date of the post-fire image.
    Status
        Progress: Evaluation of methods in process
        Maintenance and Update Frequency: As needed
    Spatial Domain
        Bounding Coordinates
            West Bounding Coordinate: -1105185.0
            East Bounding Coordinate: -1094985.0
            North Bounding Coordinate: 1715715.0 
            South Bounding Coordinate: 1706295.0
    Keywords
        Theme
            Theme Keyword Thesaurus: none
            Theme Keyword: Wildland Fire
            Theme Keyword: Wildfire
            Theme Keyword: Burned Area Emergency Response
            Theme Keyword: BAER
            Theme Keyword: differenced Normalized Burn Ratio
            Theme Keyword: dNBR
            Theme Keyword: Fire Severity
            Theme Keyword: Burn Severity
            Theme Keyword: USDA Forest Service
            Theme Keyword: Landsat 8 OLI
        Place
            Place Keyword Thesaurus: none
            Place Keyword: San Juan National Forest
            Place Keyword: WEST GUARD  Fire
    Access Constraints: Thresholded, preliminary severity estimates (BARC4 and BARC256) are only delivered to BAER teams. Further distribution is at the discretion of the BAER team leader. Pre-imagery, post-imagery, and unthresholded data are publicly available on https://fsapps.nwcg.gov/afm/baer/download.php. Access to pre-imagery and post-imagery may be limited when sensors other than Landsat or other government remote sensing assets are used due to product licensing restrictions.
    Use Constraints:  There are no restrictions on use, except for reasonable and proper acknowledgement of information sources and limitations as preliminary/draft data.
    Data Set Credit: USDA Forest Service
    Native Data Set Environment: ERDAS Imagine, ESRI ArcGIS
Data Quality Information
    Positional Accuracy
        Horizontal Positional Accuracy
            Horizontal Positional Accuracy Report: Landsat data are terrain corrected using a USGS digital elevation model with less than 1/2 pixel RMS error. Accuracy may vary for other sensors.
    Lineage
        Process Step
            Process Description: These data products are derived from Landsat 8 OLI and Landsat 8 OLI data. Pre-fire and post-fire scenes are analyzed to create a differenced Normalized Burn Ratio (dNBR) image. The dNBR image portrays the variation of burn severity within the fire. The pre- and post-fire images are terrain corrected and further processed to convert top of atmosphere reflectance. 
                The Normalized Burn Ratio (NBR) is computed for the pre- and post-fire images using the following formula:
                (NIR Band - SWIR Band) / (NIR Band + SWIR Band) = NBR

                The Differenced NBR is computed to determine severity by subtracting the post-fire NBR from the pre-fire NBR:
                (PreNBR - PostNBR) = dNBR

Spatial Data Organization Information
    Direct Spatial Reference Method: Raster
    Raster Object Information
        Vertical Count: 1
Spatial Reference Information
    Horizontal Coordinate System Definition
        Planar
            Map Projection
                Map Projection Name: USA_Contiguous_Albers_Equal_Area_Conic_USGS_version
                    Map Projection Parameters
                        Standard Parallel: 29.5
                        Standard Parallel: 45.5
                        Longitude of Central Meridian: -96.0
                        Latitude of Projection Origin: 23.0
                        False Easting: 0.0
                        False Northing: 0.0
            Planar Coordinate Information
                Planar Coordinate Encoding Method: row and column
                Coordinate Representation
                    Abscissa Resolution: 30.0
                    Ordinate Resolution: 30.0
                Planar Distance Units: Meter
        Geodetic Model
            Horizontal Datum Name: D_North_American_1983
            Ellipsoid Name: GRS_1980
            Semi-major Axis: 6378137.0
            Denominator of Flattening Ratio: 298.257222101
Distribution Information
    Resource Description: Downloadable Data
Metadata Reference Information
    Metadata Date: 2018-08-22
    Metadata Contact
        Contact Information
            Contact Organization Primary
                Contact Organization: USDA Forest Service, Geospatial Technology and Applications Center (GTAC)
                Contact Person: Justin Epting
                Contact Address
                    Address Type: mailing address
                    Address: 2222 W. 2300 S.
                    City: Salt Lake City
                    State or Province: UT
                    Postal Code: 84119
                Contact Voice Telephone: 801 975 3755 
                Contact Electronic Mail Address: baerimagery@fs.fed.us
