Name: AMTI_lk_Sticks

Display Field: Link_Info

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: This vector line layer is attributed with distance measures generated from Linkage Mapper version 0.7.5 (McRae & Kavanagh 2011). Note Section 2.8 WHCWG (2012) concerning application of Linkage Mapper in the Columbia Plateau project area. Euclidean distance = shortest straight-line distance between two HCAs. Cost-weighted distance = minimum cost-weighted distance an animal can accumulate moving from one HCA to another. Cost-weighted distance is equal to the total resistance accumulated moving along the least-cost path between the two HCAs. Cost-weighted/Euclidean distance ratio = ratio of cost-weighted to Euclidean distance between two HCAs. Higher ratios mean least-cost corridors are longer or have higher resistance. Processing by WHCWG (2013) added attributes to the stick layer: current flow centrality, effective resistance, and ratio of cost-weighted distance to effective resistance. Links with high centrality scores indicate the importance of the links for maintaining network connectivity. Effective resistance values provide a measure of connectivity that complements cost-weighted distances by taking all pathways into account (not just the least-cost path). Given a least-cost corridor and the resistance surface used to create it, effective resistance measures connectivity in a way that integrates the corridor width and number and quality of alternative pathways available within a corridor. The effective resistance of a corridor decreases (and the cost-weighted distance/effective resistance ratio increases) when corridors are wider or provide high-quality alternatives to the least-cost path. For more details on effective resistance measures, see McRae et al. (2008). Using circuit theory to model connectivity in ecology, evolution, and conservation. Ecology 10: 2712-2724.

Copyright Text:

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Spatial Reference: PROJCS["HabConnectProjectArea_North_America_Albers_Equal_Area_Conic",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting",700000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-120.0],PARAMETER["Standard_Parallel_1",43.0],PARAMETER["Standard_Parallel_2",48.0],PARAMETER["Latitude_Of_Origin",41.0],UNIT["Meter",1.0]]

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• Id ( type: esriFieldTypeInteger, alias: Id )
• Link_ID ( type: esriFieldTypeInteger, alias: Link_ID )
• Active ( type: esriFieldTypeSmallInteger, alias: Active )
• Link_Info ( type: esriFieldTypeString, alias: Link_Info, length: 254 )
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• To_Core ( type: esriFieldTypeSmallInteger, alias: To_Core )
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• CW_Dist ( type: esriFieldTypeSingle, alias: CW_Dist )
• cw_to_Euc_Dist_Ratio ( type: esriFieldTypeSingle, alias: cw_to_Euc_Dist_Ratio )
• Current_Flow_Centrality ( type: esriFieldTypeSingle, alias: Current_Flow_Centrality )
• Effective_Resistance ( type: esriFieldTypeSingle, alias: Effective_Resistance )
• cwd_to_Eff_Resist_Ratio ( type: esriFieldTypeSingle, alias: cwd_to_Eff_Resist_Ratio )
• Shape_Length ( type: esriFieldTypeDouble, alias: Shape_Length )
• CentralityClassLabel ( type: esriFieldTypeString, alias: CentralityClassLabel, length: 100 )
• CentralityClass ( type: esriFieldTypeSmallInteger, alias: CentralityClass )

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