TRIMmaps: Creating distribution maps from monitoring data and casual observations

Bird monitoring data are a very good of information to create distribution maps. Creating reliable maps from monitoring data and casual observations requires the use of advanced (geo-)statistical software.  For this purpose we have developed TRIMmaps. TRIMmaps is developed as a suite of scripts in the R-statistical language. The programme is still full in development, but can already be downloaded and used for distribution modeling.

In order to run TRIMmaps the open-source statistical programme R has to be installed first. The windows-version of R can be downloaded directly from Users of other operating systems can download R from


  • Zip-file TRIMmaps »
    This zip-file (55 Mb) contains the TRIMmaps-programme with manual and examples and Maxent.
  • Additional »
    This zip-file contains the following folders and a zip-file:
    • Literature: some literature on species distribution modelling
    • Presentations: some Powerpoint-presentations on spatial modelling
    • a zip-file with a basic R-course (‘R in a few days’) and lots of additional information and literature.

Contact: Henk Sierdsema




Sovon Vogelonderzoek Nederland, Nijmegen


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