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eferred to as the universe domain and the analysis unit is also called the query domain.The target layer must have a unique name or code field that represents each unique targetclass or type (e.g. forest type, stream type). The analysis unit layer must have an ID fieldwith a unique cod e or ID assigned to each planning unit or watershed.Once you have loadedthe required layers inthe map view, pressthe RBI button andthe RBI Calculatordialog box willappear. In the leftbox, click on thetargets files that youwant to use in the RBIanalysis. Rememberthis tool has been designed so you can run simultaneous calculations on point, line, andpolygon features. For this exercise, choose target_point_species, target_line_habitats,and target_polygon_habitats. Next, choose the analysis unit or query domain layer fromthe drop down list (tydixton_planning_units.shp). Next, choose the field from that layerthat contains the unique ID for the analysis units (ID). In the Analysis Extent drop downlist, choose the watershed boundary layer (tydixton_watershed.shp). The analysis extentis the universe domain (total landscape area) to be considered in the RBI calculations.Next, specify the Output Location as well as an Output Name. The output location is afolder, geodatabase or feature dataset. The Output Name you enter will serve as the rootname of the two feature classes that will be created by the model. The two new featureclasses that will be created in the Output Location, will be named “your_output_name_RBI_SUMMARY” and “your_output_name_RBI_ALL_TARGETS”.When you click OK, another box willappear that will ask you to specify theunique ID fields for each of the targetinput layers. For the three habitatshapefiles, you will choose the“TARGET_NAM” field. This field couldalso be a unique number code assignedto each target class or type, but it iseasier to interpret the output tables if youuse descriptive text for habitats and species such as “Wet_Limestone_ Forest,”“Karstic_Streams,” or “Endemic_Fish.” When using your own data, make sure any entryin the target name field does not contain any special characters (e.g. ñ, ó, œ) or theprogram may fail.When you have specified the target field for each of the input layers and press OK, theRBI calculations will begin processing. The process may run for quite some time,depending on number of analysis units, total number of unique targets, and complexity ofTNC Protected Area Tools (PAT) Version 3.0The Nature Conservancy, August 200936