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 "serviceDescription": "MTBS analysts examine the differenced Normalized Burn Ratio (dNBR) image for each fire in the context of remote sensing spectral data and any ancillary information available to the analyst. dNBR image data for each fire are thresholded into classes representing unburned areas; areas of low, moderate, high burn severities; and areas of increased vegetation response. Analysts follow guidelines established by subject matter experts in order to maintain consistency in discerning burn severity thresholds from fire to fire and minimize subjectivity.For a detailed definition and discussion on the processing and production of MTBS geospatial data, please refer to https://www.mtbs.gov. A synopsis of the production of this layer is provided below. MTBS burn severity class data are derived from data obtained from suitable imagery (including Landsat TM, Landsat ETM+, Landsat OLI, Sentinel 2A, and Sentinel 2B). A pre- and a post-fire scene are used to create a dNBR image. The continuous dNBR image portrays the variations of burn severity within the fire. In exceptional circumstances, a suitable pre-fire image may not be available to generate a dNBR . Consequently, analysis and assessment is conducted using the post-fire Normalized Burn Ratio (NBR) image only. The MTBS mapping approach has consistently occurred in five primary steps: 1. Fire Occurrence Data Compilation 2. Scene Selection and Image Pre-processing 3. Perimeter Delineation 4. Burn Severity Interpretation 5. Data Distribution 1. Fire Occurrence Data Compilation: Historically, MTBS compiled fire occurrence data from a number of federal and state databases that maintained little consistency in standards for content, geospatial accuracy, and nomenclature. These datasets were then filtered and standardized internally by MTBS staff in an effort to reduce duplication of incident records reported by multiple agencies, and to resolve gross geospatial inaccuracies that were commonly found in the source data. In recent years, significant improvements have been made to streamline the reporting procedures and data exchange for land management agencies in their creation and maintenance of fire occurrence data. Specifically, the Integrated Reporting of Wildland-Fire Information (IRWIN) Project has provided an end-to-end fire reporting system focused on the goals of reducing redundant data entry, identifying authoritative data sources, and improving the consistency, accuracy, and availability of operational data. Through a multi-year phased approach, the IRWIN Project is tasked with identifying and integrating fire occurrence data from a number of different sources and applications. Fire occurrence data from IRWIN are routinely ingested into a database maintained by MTBS and other postfire mapping programs, and currently make up the bulk of the records used by MTBS to identify candidate fires for mapping. More information on IRWIN can be found at: https://www.forestsandrangelands.gov/WFIT/applications/IRWIN/index.shtml",
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 "description": "Burn severity layers are thematic images depicting severity as unburned to low, low, moderate, high, and increased greenness (increased post-fire vegetation response). The layer may also have a sixth class representing a mask for clouds, shadows, large water bodies, or other features on the landscape that erroneously affect the severity classification.  This data has been prepared as part of the Monitoring Trends in Burn Severity (MTBS) project. \n\nDue to the lack of comprehensive fire reporting information and quality Landsat imagery, burn severity for all targeted MTBS fires are not available.  Additionally, the availability of burn severity data for fires occurring in the current and previous calendar year is variable since these data are currently in production and released on an intermittent basis by the MTBS project.",
 "copyrightText": "The USDA Forest Service makes no warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose, nor assumes any legal liability or responsibility for the accuracy, reliability, completeness or utility of these geospatial data, or for the improper or incorrect use of these geospatial data. These geospatial data and related maps or graphics are not legal documents and are not intended to be used as such. The data and maps may not be used to determine title, ownership, legal descriptions or boundaries, legal jurisdiction, or restrictions that may be in place on either public or private land. Natural hazards may or may not be depicted on the data and maps, and land users should exercise due caution. The data are dynamic and may change over time. The user is responsible to verify the limitations of the geospatial data and to use the data accordingly.",
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  "Comments": "Burn severity layers are thematic images depicting severity as unburned to low, low, moderate, high, and increased greenness (increased post-fire vegetation response). The layer may also have a sixth class representing a mask for clouds, shadows, large water bodies, or other features on the landscape that erroneously affect the severity classification.  This data has been prepared as part of the Monitoring Trends in Burn Severity (MTBS) project. \n\nDue to the lack of comprehensive fire reporting information and quality Landsat imagery, burn severity for all targeted MTBS fires are not available.  Additionally, the availability of burn severity data for fires occurring in the current and previous calendar year is variable since these data are currently in production and released on an intermittent basis by the MTBS project.",
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