Identification_Information: Citation: Citation_Information Originator: USDA Forest Service Publication_Date: 20130607 Publication_Information: Publication_Place: Salt Lake City, Utah, USA Publisher: U.S. Forest Service Title: BARC Data Bundle for the WHITE Fire occuring on the Los Padres National Forest National Forest - 2013 Geospatial_Data_Presentation_Form: raster digital data Online_Linkage: http://activefiremaps.fs.fed.us/baer/download.php?year=2013 Description: Abstract: These data products are derived from Landsat Thematic Mapper 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. Purpose: These data were created by the USDA Forest Service Remote Sensing Applications Center to support Burned Area Emergency Response (BAER) teams. Supplemental_Information: Fire Name: WHITE Agency: US Forest Service Land Management Unit: Los Padres National Forest National Forest Type of assessment: Fire size (acres) as listed on the Situation Report: 1984 Pre-Fire Landsat Path/Row and Date: Landsat 42/36; 20130520 Post-Fire Landsat Path/Row and Date: Landsat 42/36; 20130605 Output Dataset Projection: UTM UTM Zone: 11 Spheroid Name: NAD83 Product List: CA3454311980320130527_20130520_20130520_l8_refl_utm.tif = Pre-Fire Landsat reflectance at sensor data subset, scaled by 400 and converted to integer (bands 7,5,4 Tiff format) CA3454311980320130527_20130520_20130605_l8_refl_utm.tif = Post-Fire Landsat reflectance at sensor data subset, scaled by 400 and converted to integer (bands 7,5,4 Tiff format) CA3454311980320130527_20130520_20130605__utm.tif = Continuous dNBR product scaled by 1000; theoretical range of values is -2000 to 2000 CA3454311980320130527_20130520_20130605__barc256_utm.tif = 256-class (0-255) continuous image representing fire severity. This dataset is meant to be adjusted if the BARC4 does not provide a good estimate of fire severity. It is anticipated that users will adjust the breakpoints between classes, then recode to their desired 3 or 4 classes. CA3454311980320130527_20130520_20130605__barc4_utm.tif = Four category severity classification subset values: 1 = unchanged / very low (Dark Green) 2 = low severity (Cyan) 3 = moderate severity (Yellow) 4 = high severity (Red) Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20130520 (pre-fire image), 20130605 (post-fire image) Currentness_Reference: Severity data created from post-fire image Status: Progress: Evaluation of methods in process Maintenance_and_Update_Frequency: As needed Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: Wildland Fire Theme_Keyword: Normalized Burn Ratio (NBR) Theme_Keyword: Fire Severity Theme_Keyword: USDA Forest Service Theme_Keyword: Landsat Place: Place_Keyword_Thesaurus: none Place_Keyword: Los Padres National Forest National Forest Place_Keyword: WHITE Access_Constraints: FTP data sets are available to any user with access to the USFS FSWEB. Use_Constraints: There are no restrictions on use, except for reasonable and proper acknowledgement of information sources. Data_Set_Credit: USDA Forest Service Native_Data_Set_Environment: ERDAS Imagine, ARCInfo Data_Quality_Information: Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: These data were terrain corrected using a USGS digital elevation model with less than 1/2 pixel RMS error. Lineage: Process_Step: Process_Description: These data products are derived from Landsat Thematic Mapper 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 Landsat images are terrain corrected and further processed to convert bands 1-5 and 7 to at-sensor-reflectance. The Normalized Burn Ratio (NBR) is computed for each date of imagery using the following formula: (Band 4 - Band 7) / (Band 4 + Band 7) = 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 products are a generalization of the raw dNBR dataset. Both BARC products have been resampled to unsigned 8-bit images and are easily viewed and edited within ArcGIS. The classes represented on the BARC products are created with thresholds chosen by an analyst at RSAC. These thresholds can be roughly related back to original dNBR values by multiplying by 5 and then subtracting 275 (for example, a BARC256 value of 100 would relate to a dNBR value of 225). The BARC thresholds used on this particular fire are: Unchanged: All values less than 65. Low: All values greater than 65 and less than 125. Moderate: All values greater than 125 and less than 187. High: All values greater than 187. General descriptions of the severity classes are below: Unchanged: This means the area after the fire was indistinguishable from pre-fire conditions. This does not always indicate the area did not burn. Low: This severity class represents areas of surface fire with little change in cover and little mortality of the dominant vegetation. Moderate: This severity class is between low and high and means there is a mixture of 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: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 11 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 30.000000 Ordinate_Resolution: 30.000000 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Distribution_Information: Resource_Description: Downloadable Data Metadata_Reference_Information: Metadata_Date: 20130607 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USDA Forest Service, Remote Sensing Applications Center (RSAC) Contact_Person: Carl Albury Contact_Address: Address_Type: 2222 W. 2300 S. City: Salt Lake City State_or_Province: UT Postal_Code: 84119 Contact_Voice_Telephone: 801-975-3351