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Wildfire Suppression Difficulty Index (SDI) 97th Percentile is a rating of relative difficulty in performing fire control work under regionally appropriate fuel moisture and 20 mph uphill winds (@ 20 ft); Wildfire Suppression Difficulty Index (SDI) 90th Percentile is a rating of relative difficulty in performing fire control work under regionally appropriate fuel moisture and 15 mph uphill winds (@ 20 ft). Wildfire Suppression Difficulty Index (SDI) 80th Percentile is a rating of relative difficulty in performing fire control work under regionally appropriate fuel moisture and 10 mph uphill winds (@ 20 ft).<\/SPAN><\/P>

<\/P>

SDI factors in topography, fuels, expected fire behavior under prevailing conditions, fireline production rates in various fuel types with and without heavy equipment, and access via roads, trails, or cross-country travel. SDI does not account for standing snags or other overhead hazards to firefighters, so it is not a firefighter hazard map. It is only showing in relative terms where it is harder or easier to perform suppression work.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>", "pixelType": "U16", "meanPixelSize": 30, "exportTilesAllowed": false, "editFieldsInfo": null, "rasterTypeInfos": [{ "help": "", "name": "Raster Dataset", "description": "Supports all ArcGIS Raster Datasets" }], "defaultResamplingMethod": "Nearest", "itemAccess": false, "minScale": 0, "serviceProperties": "NorthWest<\/MosaicMethod>First<\/MosaicOperator>true<\/SortAscending><\/LockImageID>name<\/TileOrderField>0<\/TileOrderBase>600.000000<\/AvgImageSpacingX>300.000000<\/AvgImageSpacingY>0.0<\/ViewPointX>0.0<\/ViewPointY>0.0<\/ViewPointDefShiftX>0.0<\/ViewPointDefShiftY>None<\/CompressionMethod>75<\/CompressionQuality>0.010000<\/CompressionTolerance>Nearest<\/SamplingMethod><\/ImageServiceProperties><\/ImageServer>", "advancedQueryCapabilities": { "supportsStatistics": true, "supportsOrderBy": true, "useStandardizedQueries": true, "supportsPagination": true, "supportsDistinct": true }, "serviceItemId": "175683ed6e634cc2ad5989d4fb47193b", "capabilities": "Image,Metadata,Catalog,Mensuration", "maxScale": 0, "stdvValues": [33.567248884576337], "allowedFields": "name,minps,maxps,lowps,highps,tag,groupname,productname,centerx,centery,zorder", "minPixelSize": 0, "sortAscending": true, "maxMosaicImageCount": 20, "inspectionCapabilities": "", "maxPixelSize": 0, "uncompressedSize": 63655246564, "serviceDescription": "

Wildfire Suppression Difficulty Index (terrestrial) (SDIt) is a quantitative rating of relative difficulty in performing fire control work. In its original formulation for use in Spain, SDI included aerial resource use, however for development and application in the United States we removed the aerial resource component due to a lack of consistent data. We note this distinction of \u201cterrestrial only\u201d calculations with the inclusion of \u201ct\u201d in the acronym. SDIt factors in topography, fuels, expected fire behavior under severe fire weather conditions, firefighter line production rates in various fuel types, and accessibility (distance from roads/trails) to assess relative suppression effort. For this dataset severe fire behavior is modeled with 15 mph up-slope winds and fully cured fuels. SDI has a continuous value distribution from 1-10. Here it is binned to six classes from lowest to highest difficulty.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>", "allowCopy": true, "copyrightText": "US Forest Service, National Office, Fire and Aviation Management, Strategic Analytics Branch, Risk Management Assistance, US Forest Service, Rocky Mountain Research Station", "mensurationCapabilities": "Basic", "ownershipBasedAccessControlForRasters": null }