Dear list,I am in search of a good projection with which I could run habitat utilization models on a continental scale. The projection I am looking for should preserve distances between points as good as possible and the map units should be meters. I think from what I have explored so far from the implementations of movement in habitat use models, preserving distance is the most important factor. Most solutions I found ready made were fine if you are working on a small scale of a few hectares or even a couple of square kilometers. The projection I am looking for should optimize "truth" in distances and be in meters (at least for the time being) for almost all of North-America and large stretches of South-America. I am aware that there is no single real solution out there for this large area, but there should be some projections with a minimal amount of error given the extent (so to speak an optimum). I quite often used spTransform, but never dealt with other things than longlat into moll or aitoff sometimes in utm and vice versa. I have no experience whatsoever with map units (and wouldn't know how to set or change them), as this wasn't an issue up to now, and only scratched the surface of oblique projections (sorry I am a biololgist in the first place trying to avoid making all too many mistakes in geography). I appreciate some expert opinion on this.
The bbox (in longlat) of the area for which I am looking for a good projection is: min max
x1 -127.2 -46.8 x2 -19.7 48.6 Many thanks in advance, Kami -- Kamran Safi Max Planck Institute for Ornithology Vogelwarte Radolfzell Schlossallee 2 78315 Radolfzell Germany and Institute of Zoology Zoological Society of London Regent's Park NW1 4RY London United Kingdom
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