Identification Information Citation Originator: USDA Forest Service, Geospatial Technology and Applications Center, BAER Imagery Support Program Publication Date: 2017-07-11 Title: Final soil burn severity data for the CAJETE Fire occurring on the Santa Fe National Forest - 2017 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=2017 Description Abstract: Final soil burn severity assessment derived from Landsat 8 OLI data. Pre-fire and post-fire subsets 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. This product has been validated in the field by BAER assessment team based on field observation and data collection. 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: CAJETE Agency: USDA Forest Service Land Management Unit: Santa Fe National Forest Type of assessment: Emergency Fire size (as mapped): 1659 acres Pre-Fire Imagery Date and Path/Row: 2016-06-14; 033/035 Post-Fire Imagery Date and Path/Row: 2017-06-17; 033/035 Output Dataset Projection: NAD_1983_UTM_Zone_13N Datum: D_North_American_1983 Spheroid Name: GRS_1980 Mapping Comments: Some areas of in the burn boundary are still active. The thematic severity products may be inaccurate in these areas. Product List Final soil burn severity dataset. Subset values: 1 = unburned / undetectable (Dark Green) 2 = low severity (Cyan) 3 = moderate severity (Yellow) 4 = high severity (Red) Time Period of Content Multiple Dates/Times Single Date/Time Calendar Date: 2016-06-14 (pre-fire image) Single Date/Time Calendar Date: 2017-06-17 (post-fire image) Currentness Reference: Severity data correspond to the date of the post-fire image. Status Progress: Complete Maintenance and Update Frequency: As needed Spatial Domain Bounding Coordinates West Bounding Coordinate: 353967.102015 East Bounding Coordinate: 364677.102015 North Bounding Coordinate: 3968766.0794 South Bounding Coordinate: 3958686.0794 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 Theme Keyword: Landsat 8 OLI Place Place Keyword Thesaurus: none Place Keyword: Santa Fe National Forest Place Keyword: CAJETE Fire Access Constraints: Field-validated soil burn severity datasets have no access restrictions. Preliminary BARC products are restricted to BAER team use only. 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 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 (dNBR) is computed to determine severity by subtracting the post-fire NBR from the pre-fire NBR: (PreNBR - PostNBR) = dNBR Two preliminary Burned Area Reflectance Classification (BARC) products are created based on generalizations of the raw, continuous dNBR dataset. Both BARC products are resampled to unsigned 8-bit GeoTIFF. The final soil burn severity dataset is a field-validated version of the BARC256 that has been either validated based on field data and observation or validated and modified where appropriate. The classes represented on the soil burn severity dataset are either modififed or validated by the BAER assessment team. The BAER team may use the same thresholds created by the remote sensing analyst at GTAC, or they may modify the thresholds based on field observations and data collection. The thresholds used for this mapping are: Unburned / Undetectable: All values less than or equal to 70. Low: All values greater than 70 and less than or equal to 104. Moderate: All values greater than 104 and less than or equal to 182. High: All values greater than 182. General descriptions of the severity classes are below: Unburned / Undetectable: This means 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: This severity class represents areas of surface fire with little detected change in cover and little detected mortality of the dominant vegetation. Moderate: This severity class is between low and high and means there is a mixture of detected effects on the dominant vegetation. High: This severity class represents areas where the canopy has high to complete consumption. Spatial Data Organization Information Direct Spatial Reference Method: Raster Raster Object Information Vertical Count: 1 Spatial Reference Information Horizontal Coordinate System Definition Planar Grid Coordinate System Grid Coordinate System Name: NAD_1983_UTM_Zone_13N Universal Transverse Mercator UTM Zone Number: 13N Transverse Mercator Scale Factor at Central Meridian: 0.9996 Longitude of Central Meridian: -105.0 Latitude of Projection Origin: 0.0 False Easting: 500000.0 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: 2017-07-11 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 ******************************************************************************** The following section should be completed after the BARC has been field validated by the BAER team and this entire metadata file should be returned to GTAC with the Soil Burn Severity data. BAER Assessment Completion Date: 6/24/17 BAER Team GIS Analyst: Hillary Hudson BAER Team Leader:Will Amy Soil Burn Severity Analyst(s): Micah Kiesow Original BARC256 thresholds: Unburned / Undetectable: <=70 Low: >70 and <=104 Moderate: >104 and <=182 High: >182 Soil Burn Severity thresholds: Unburned / Undetectable: 0-70 Low: 71-104 Moderate: 105-180 High:>180 Sequence of steps used to create Soil Burn Severity data: After field checking BARC values pixels with values 181 and 182 were added to the high severity class. Those values were reclassified in a 4 class raster. No other adjustment methods were utilized.