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Finding the sure absent regions where an environmental factor is limiting the species occurrence should be among the initial tasks of species distribution modelling.
Create a map presenting sites of land use and soil combinations with at least 20 observation locations but no find sites in map sheet 6372.
Observation locations of Potentilla. fruticosa are in the attached archive (file All_P_fruticosa.txt).
The module for frequency mapping
outputs 9 categories.
Set the necessary number of presences to 0 and the necessary number of absences to 20.
The category of enough absences and no presences should be dark grey in the output map.
You can save the output map by choosing Save from the pop-up menu or using PrntScr from the keyboard.
It would be nice to change the colours of output map in Photoshop. The calculator does not offer the colours to be selected by the user.
An image of the species in flowers
and P. fruticosa
in an alvar wooded meadow