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EXERCISE 2. Calculating the Relative Biodiversity Index (RBI)REMEMBER• All layers used in the analysis must be in the same projection andhave the projection information defined. Do not use Geographicprojection (e.g. decimal degrees) since unit areas or lengths will becalculated incorrectly.• The RBI Module does NOT require an ArcGIS ArcInfo Level.• The Universe Domain is the total study area or landscape (i.e. largewatershed, political boundary)• The Query Domain is the analysis unit or planning unit layer (i.e.hexagons or sub-catchment watersheds) and must have an ID fieldwith a unique number assigned to each unit. A hexagon layer can begenerated using “HexGen” in the Marxan Tools.• The word “Target” refers to a conservation habitat or species and canbe represented as a point, line, or polygon. When using your own data,make sure any entry in the target name field does not contain anyspecial characters (e.g. ñ, ó, œ) or the program may fail.• The target layer must have a unique name or ID field that representseach unique target class or type (e.g. forest type, stream type, species).2.1 Running the RBI ModuleThe RBI tool requires three input data layersto operate on. The first layer is the targetlayer, or the layer that represents theconservation targets. These can be points,lines, or polygons. The second requiredlayer is the universe domain, a polygonfeature that represents the total analysisextent to be considered. This could be acountry boundary or a watershed. The finallayer needed is the query domain, also apolygon feature that represents the analysisor planning unit layer and the basic unit thatreceives the RBI calculation. This could behexagons, or other polygon features such aswatersheds.Prior to clicking on the RBI button, make sure you have the input files that will be used,loading into the view. For this exercise, this includes the target shapefiles(target_point_species.shp, target_line_habitats.shp, and target_polygon_habitats.shp);the Tydixton Park watershed boundary (tydixton_watershed.shp); and the analysis unithexagons (tydixton_planning_units.shp). Remember that the analysis extent is alsoTNC Protected Area Tools (PAT) Version 3.0The Nature Conservancy, August 200935