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Layer: AMTI_lk_Sticks (ID: 0)

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.

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Supported Query Formats: JSON, geoJSON

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Supports Statistics: true

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