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Layer: Classified Wildfire Hazard and Building Density (ID:2)

View In:   Map Viewer

Name: Classified Wildfire Hazard and Building Density

Display Field: OID_COPY

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: <div style="text-align:left;"><p style><span style="font-size:12pt;">This layer integrates wildfire hazard and building density. </span></p><p style><span style="font-size:16px;">Wildfire hazard is based on a number of inputs: modeled flame length using the 2020 Marin County 5-meter fuel model, extreme fire weather potential, ember load index, suppression difficulty index, human development proximity, transmission line proximity, and historic ignitions. These inputs were assigned weights and summed. </span><span style="font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;">The resulting values were published as a 20 meter countywide raster and the mean hazard value was calculated for each fine scale vegetation map stand</span><span style="font-size:16px;">. This data is displayed independently in the </span><a href="https://www.arcgis.com/home/item.html?id=1634ea2f1cfa431c86f05be67606a778&amp;sublayer=1" target="_blank">Classified Mean Wildfire Hazard Within Stand</a><span style="font-size:16px;"> polygon layer.</span></p><p style><span style="font-size:16px;">Building density is derived from finding the number of structures (and their density) for each fine scale vegetation map polygon. The source of the structure locations is the Marin Countywide impervious surfaces map. This data is displayed independently in the </span><a href="https://www.arcgis.com/home/item.html?id=1634ea2f1cfa431c86f05be67606a778&amp;sublayer=5" target="_blank">Classified Building Density (Within Stand)</a><span style="font-size:16px;"> polygon layer.</span></p><p style><span style="font-size:12pt;">B</span><span style="font-size:16px;">ivariate symbology was used to highlight </span><span style="font-size:16px;">areas that have both high relative wildfire hazard and building density. In this map, areas of significance are highlighted by displaying </span><span style="font-size:16px;">only wildfire hazard values greater than four (classified as Highest Hazard, Very High Hazard, or High Hazard) and building density classification of greater </span><span style="font-size:16px;">than 0.1 structures per acre (i.e., polygons with 0 structures per acre are not displayed).</span><span style="font-size:12pt;"> </span></p><p style>See Chapter 8 of the <a href="https://www.onetam.org/sites/default/files/pdfs/marin_regional_forest_health_strategy_2023.pdf" target="_blank">Marin Regional Forest Health Strategy</a> (Page 442 - Integrating Building Density with Wildfire Hazard) for more information.<br /></p><p style><br /></p></div>

Copyright Text:

Min. Scale: 0

Max. Scale: 0

Default Visibility: false

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

Drawing Info:

HasZ: false

HasM: false

Has Attachments: false

Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

Unique ID Field:

Global ID Field: GlobalID

Type ID Field: SYMBOLOGY

Fields:
Types:

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 9/27/2023 8:46:36 PM

Schema Last Edit Date: 9/6/2023 8:45:09 PM

Data Last Edit Date: 12/22/2022 8:21:14 PM

Supported Operations:   Query   Query Pivot   Query Top Features   Query Analytic   Query Bins   Generate Renderer   Validate SQL   Get Estimates   ConvertFormat