Tool name * PAT

Protected Area Tools (PAT) v. 2.0. The majority of the work that goes into a protected area gap assessment involves the spatial delineation and critical evaluation of habitats/species, protected areas, and risks to focal habitats. The Protected Area Tools are ready to be used only after users have obtained the highest quality data available, conducted an ecological inventory and assessment of these data layers through expert review, and carefully considered all model scenario settings. PAT consists of three conservation modules which operate within Environmental Systems Research Institutes (ESRI) ArcGIS 9.2 Geographic Information System (GIS) software:

  1. Environmental Risk Surface (ERS)
  2. Relative Biodiversity Index (RBI)
  3. Marxan Tools
Category All, Mapping, Spatial Analysis, Spatial Planning
What step(s) in analysis framework 1a, 2a, 2b
What step(s) in Governance framework

PAT operates on three basic input data layers including a) habitats/species; b) risks elements to habitats/species; and c) protected areas. PAT will process feature classes from geodatabases and shapefiles.

Data Quality Required


Modification Required

Not available

Expertise Required

Required Software required: ArcGIS 9.3, Microsoft.Net Framework 2.0, .Net support for ArcGIS 9.3 Environmental Risk Surface is based on mapped risk elements that have been identified through expert review, where values for variables are derived through the expert evaluation of the extent, severity, and reversibility of each risk element in relation to the conservation target(s). Prior to modeling an ERS, experts must identify how risk in each element decays over distance, or if there is a decay factor at all.

Spatial and Temporal

Not available


Developing a customized Environmental Risk Surface (ERS) based on mapped risk elements (i.e. socio-economic activities) that have been identified through expert review as having negative impacts on the health of targeted habitats, species or ecological systems; Calculating a landscape's Relative Biodiversity Index (RBI), which measures relative rareness or uniqueness, measured in terms of biodiversity feature abundance in comparison to the overall study area. Individual scores for each biodiversity occurrence can be used as a stand alone assessment for each planning unit or subsets of units (e.g. hexagons, watersheds).

License cost issues


Literature: References & Manuals *