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marlonecobos / kuenm

kuenm: An R package for detailed calibration and construction of Maxent Ecological Niche Models.
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Analysis in other spatial projections? #20

Closed jmburgos closed 2 years ago

jmburgos commented 3 years ago

Hi Marlon,

I am planning on running some models in high latitudes, and my data (observations and environmental predictors) are in a projected system ( Lamberts Equal Area projection) as opposed to be in "regular" latitude and longitude. My models are big, so I need to run them in SWD mode. The SWD files have columns named "latitude" and "longitude", but I presume that it should not matter if the values in these columns are actual degrees, or numbers in any other projected system, correct? Or for some reason is a requirement that the data is converted to latitude/longitude values?

Many thanks,

Julian

marlonecobos commented 3 years ago

Hi @jmburgos, I think maxent requires the data to be in WGS84. But I am not completely sure. You can always try. The other option is to change the projection of your data and variables, that should not be a problem if you use packages like sp and raster.

I hope it helps.

jmburgos commented 3 years ago

Thanks Marlon, actually it should not matter in which projection you are working. Maxent fits the model in environmental space and (as far as I know) the spatial projection of the observation should not be relevant. I have been doing models in large areas in the Arctic using the Lamberts projection and they work well. I was actually asking if there was something in kuenm that assumed that the positions were in WGS84.