Identification Information Citation Originator: USDA Forest Service, Geospatial Technology and Applications Center, BAER Imagery Support Program Publication Date: 2024-11-18 Title: Soil Burn Severity Dataset for the shoe Fire occurring on the Shasta-Trinity National Forest National Forest 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 Description Abstract: This soil burn severity dataset was derived from Sentinel 2 data and field validated by a Forest Service Burned Area Emergency Response (BAER) team. It is based upon an initial Burned Area Reflectance Classification (BARC) dataset created by analyzing satellite imagery. A pre-fire and post-fire Sentinel 2 scene were processed to develop a differenced Normalized Burn Ratio (dNBR) image. The dNBR image attempts to portray the variation of burn severity within a fire and captures the combined effects of the fire to vegetation and soil components of the ecosytem. The preliminary BARC dataset was assessed by a Forest Service BAER team and modified, if necessary, based on field conditions. 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: shoe Agency: USDA Forest Service Type of assessment: Emergency Fire size (as mapped): 4360 acres Pre-Fire Imagery Date : 2024-10-05 Post-Fire Imagery Date : 2024-10-18 Output Dataset Projection: NAD_1983_UTM_Zone_10N Datum: D_North_American_1983 Spheroid Name: GRS_1980 Mapping Comments: None Product List shoe_ca4092412210820241009_sbs.tif = Soil burn severity (SBS) dataset in raster format shoe_ca4092412210820241009_SBS.png = PNG thumbnail version of the SBS Shoe_BAER_AnalysisArea_Final.shp = Shapefile of fire area analyzed in BAER assessment Time Period of Content Multiple Dates/Times Single Date/Time Calendar Date: 2024-10-05 (pre-fire image) Single Date/Time Calendar Date: 2024-10-18 (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: 573653.3691439606 East Bounding Coordinate: 579153.3691439606 North Bounding Coordinate: 4534930.820207465 South Bounding Coordinate: 4526630.820207465 Keywords Theme Theme Keyword Thesaurus: none Theme Keyword: Wildland Fire Theme Keyword: Wildfire Theme Keyword: Burned Area Emergency Response Theme Keyword: BAER Theme Keyword: dNBR Theme Keyword: Fire Severity Theme Keyword: Burn Severity Theme Keyword: USDA Forest Service Place Place Keyword Thesaurus: none Place Keyword: CA Place Keyword: shoe Fire Access Constraints: These data are publicly available. 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: GeoTiff Data Quality Information Positional Accuracy Horizontal Positional Accuracy Horizontal Positional Accuracy Report: Landsat data are terrain corrected using ground control points and processed to an RMSE of less than 1/2 pixel. Lineage Process Step Process Description: These data products are derived from Sentinel 2 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 The BARC perimeter had several masked areas due to active fire and smoke cover. It also had purposly excluded areas that had not burned as of the time of BARC acquisition. Field sampling was focused in these areas where satellite imagery was limited, as much as access would allow. However, much of the fire is unroaded and very steep, so some assumptions had to be made about unimaged areas. The BARC 256 was first adjusted for the whole fire (including areas outside the BARC Boundary). Overall, unburned area was reduced (changed to low), and some moderate was also increased (changed low to mod). Manual location edits were also needed throughout the fire. In masked areas, high pockets (likely active flame etc.) were changed to low, or occasionally moderate. Additionally, areas were hand-drawn in mapped unburned to change the final severity to low SBS. Other areas of moderate and high SBS were created where field sampling indicated SBS needed adjustment. Additional Comments: Overall, the shoe fire burned at low severity (69%), and forest canopy cover was fairly intact & green above the ground surface. Thus, this was a fairly difficult fire to map SBS on accurately. That said, field conditions showed a good mosaic burn of low, moderate, and very low with high potential for needlecast additions of ground cover. Thus, even if the SBS burn pattern doesn't match ground conditions exactly, the final product should represent a low overall risk for modeling purposes (excepting one small subwatershed north of Madrone Campground). Original BARC thresholds: Unburned/Low threshold = 61 Low/Moderate threshold = 122 Moderate/High threshold = 178 Revised SBS thresholds: Unburned/Low threshold = 55 Low/Moderate threshold = 112 Moderate/High threshold = 178 General descriptions of the severity classes are below: Unburned / Very low: The area after the fire was indistinguishable from pre-fire conditions. This does not always indicate the area did not burn (i.e. canopy may be occluding the burn signal). Low: Areas of surface fire with little detected change in cover and little detected mortality of the dominant vegetation. Little to no change in the soil color, structure and condition occured. Moderate: This severity class is between low and high and means there is a mixture of detected effects on the dominant vegetation. High: Areas where the canopy has high to complete consumption. Changes to soil structure, color and condition are significant and hydrophobicity may have occured. 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: NAD_1983_UTM_Zone_10N Map Projection Parameters Standard Parallel: 0.0 Standard Parallel: 0.0 Longitude of Central Meridian: -123.0 Latitude of Projection Origin: 1.0]];-5120900 -9998100 450445547.391054;-100000 10000;-100000 10000;0.001;0.001;0.001;IsHighPrecisio False Easting: 500000.0 False Northing: 0.0 Planar Coordinate Information Planar Coordinate Encoding Method: row and column Coordinate Representation Abscissa Resolution: 20.0 Ordinate Resolution: 20.0 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: 2024-11-18 Metadata Contact Contact Information Contact Organization Primary Contact Organization: USDA Forest Service, Geospatial Technology and Applications Center (GTAC) Contact Person: Mark Nigrelli Contact Address Address Type: mailing address Address: 125 S. Sate St., Suite 7105 City: Salt Lake City State or Province: UT Postal Code: 84138 Contact Voice Telephone: 801 975 3479 Contact Electronic Mail Address: baerimagery@fs.fed.us