The environmental variables
In this module we will see where and how find environmental layers to build our SDM. Then we will refine again our dataset taking into account the spatial resolution of the environmental layer. Finally, we will see how to deal with the problem of multi-collinearity in environmental layers. At the end on this module we will have a dataset with occurrences and a number of layer that we will use to train our SDM in module 3.
References
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Dormann CF, Elith J, Bacher S, Buchmann C, Carl G, Carré G, Garcìa Marquéz JR, Gruber B, Lafourcade B, Leitão PJ, Münkemüller T, McClean C, Osborne PE, Reineking B, Schröder B, Skidmore AK, Zurell D, Lautenbach S. 2013. Collinearity: a review of methods to deal with it and a simulation study evaluating their performance. Ecography 36: 27–46.
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Zuur AF, Ieno EN, Elphick CS. 2010. A protocol for data exploration to avoid common statistical problems. Methods in Ecology & Evolution 2010, 1, 3–14