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The purpose of Suppression Difficulty Index (SDI) is to map the relative difficulty of performing fire control work for large fire containment strategy development, incident prioritization, and other broad scale fire and fuels management planning tasks. Data users are encouraged to access the methods report for more details.
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| summary:
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The purpose of Suppression Difficulty Index (SDI) is to map the relative difficulty of performing fire control work for large fire containment strategy development, incident prioritization, and other broad scale fire and fuels management planning tasks. Data users are encouraged to access the methods report for more details.
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| accessInformation:
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USDA Forest Service, Fire and Aviation Management, Strategic Analytics Branch.
USDA Forest Service. 2026. Alaska Suppression Difficulty Index (SDI), version 2026. USDA Forest Service National Office, Fire and Aviation Management, Strategic Analytics Branch, Washington DC.
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thumbnail/thumbnail.png
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4622324.4343090001
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| typeKeywords:
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["ArcGIS Server","Data","Image Service","Service"]
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| description:
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<div style='text-align:Left;'><div><div><p><span>Suppression Difficulty Index (SDI) is an expert-based model of how potential fire behavior and operational factors combine to influence suppression difficulty across broad landscapes (Rodríguez y Silva et al. 2020). The formulation for SDI is premised on the concept that fire behavior acts as a driving force in the numerator and conditions that facilitate suppression act as resisting forces in the denominator. The numerator, also called the energy behavior index (Ice), grows in response to conditions that increase fire behavior, so SDI will increase where and when fuel, topography, and weather conditions promote extreme fire behaviors. The denominator sums the values for sub-indices representing how accessibility (Ia), penetrability (Ip), and fireline creation (Ic) influence suppression opportunities across the landscape. Higher values for sub-indices in the denominator indicate better conditions for suppression, which lowers SDI for a given energy behavior index value in the numerator. The United States implementation of SDI includes an additional slope factor to reflect that working in steep environments is difficult regardless of the fire behavior and other operational factors. This edition of SDI was modeled using 2026 capable fuels data. The flame length and heat per unit area inputs to SDI were modeled for typical large wildfire conditions in Alaska (Fuel moistures of 1-hr: 6%, 10-hr: 7%, 100-hr: 8%, Herbaceous: 85%, Woody: 100%; Wind speeds of 15-mph @ 20-ft in the uphill direction; Finney crown fire initiation model). See the full methods report for more details.</span></p></div></div></div>
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<div style='text-align:Left;'><div><div><p><span>The USDA 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.</span></p></div></div></div>
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| catalogPath:
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| title:
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USFS_EDW_SAB_WildfireSuppressionDifficultyIndexAK
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| type:
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Image Service
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| url:
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https://imagery.geoplatform.gov/iipp
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| tags:
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["Alaska","AK","Wildfire Suppression Difficulty Index","Wildfire","SDI","IIPP","USFS","Forest Service","Interdepartmental Imagery Publication Platform"]
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| culture:
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en-US
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| portalUrl:
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| name:
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USFS_EDW_SAB_WildfireSuppressionDifficultyIndexAK
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591657527.591555
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| spatialReference:
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WGS_1984_Web_Mercator_Auxiliary_Sphere
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