Identification Information Citation Originator: USDA Forest Service, Geospatial Technology and Applications Center, BAER Imagery Support Program Publication Date: 2024-06-02 Title: Burned Area Reflectance Classification (BARC) Data Bundle for the BLUE 2 Fire occurring on the Lincoln National Forest - 2024 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=2024 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: BLUE 2 Agency: USDA Forest Service Land Management Unit: Lincoln National Forest Type of assessment: Emergency Fire size (as mapped): 7585 acres Pre-Fire Imagery Date and Path/Row: 2024-05-12; 032/037 Post-Fire Imagery Date and Path/Row: 2024-05-28; 032/037 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 nm3342810580020240516_20240512_l8_refl.tif = Pre-Fire Landsat 8 OLI reflectance at sensor data subset, scaled by 400 and converted to integer (band order (1-8): Coastal Blue, B, G, R, NIR, SWIR-1, SWIR-2, Cirrus). For best viewing set RGB to bands 7, 5, 4. nm3342810580020240516_20240528_l8_refl.tif = Post-Fire Landsat 8 OLI reflectance at sensor data subset, scaled by 400 and converted to integer (band order (1-8): Coastal Blue, B, G, R, NIR, SWIR-1, SWIR-2, Cirrus). For best viewing set RGB to bands 7, 5, 4. nm3342810580020240516_20240512_20240528_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: 2024-05-12 (pre-fire image) Single Date/Time Calendar Date: 2024-05-28 (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: -906645.0 East Bounding Coordinate: -891735.0 North Bounding Coordinate: 1205415.0 South Bounding Coordinate: 1192965.0 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: Lincoln National Forest Place Keyword: BLUE 2 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; USGS 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: 2024-06-02 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 and physical address Address: 125 South State Street, Suite 7105 City: Salt Lake City State_or_Province: UT Postal_Code: 84138 Contact Voice Telephone: 801 975 3755 Contact Electronic Mail Address: baerimagery@fs.fed.us