[R-sig-eco] Create a grid and extract species and climate data

[Adam Zeilinger]

Hi Buddhi,

Assuming your climate data are represented as a series of rasters and 
your species occurrences have latitude and longitude coordinates, you 
can accomplish both of these things with the raster package.  Using one 
of the climate rasters as a reference raster, you can use the function 
cellFromXY() to determine species presence/absence in your cells. And 
the extract() function in raster can be used to get the climate values 
from climate data rasters.

Hope this helps.
Adam


On 2/3/2016 2:32 AM, Frederico V. Faleiro wrote:
> Hi Buddhi,
>
> You can do it easily with the package letsR (
> http://onlinelibrary.wiley.com/doi/10.1111/2041-210X.12401/abstract).
>
> Cheers,
>
> Frederico
>
> On Wed, Feb 3, 2016 at 6:16 AM, Buddhi Dayananda [via r-sig-ecology] <
> ml-node+s471788n7579687h53 at n2.nabble.com> wrote:
>
>> Dear friends,
>>
>> I am looking for R support to arrange my dataset which I tried and failed
>> in Arc GIS.
>>
>> I have 6 bioclimatic variables and 14 species. I want to create a
>> 10kmX10Km
>> grid to Australia (like a fishnet in Arc GIS) and extract presence/absence
>> ( 1/0) of species in each grid and mean/ or values for each variable (
>> like
>> a matrix).
>>
>> Eg
>>
>>   Grid number or centroid coordinates Sp1 Sp2 Sp3 Sp4 Bio1    Bio2
>>
>> 1                                    1  1   0   1    25      15
>>
>> 2                                    0  0   1   0    19      20
>>
>> 3                                    1  0   0   0    25      30
>>
>> 4                                    0  0   1   1    18      25
>>
>>
>> Any assistance would help.
>>
>> Buddhi
>>
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-- 
Adam Zeilinger
Postdoctoral scholar
Berkeley Initiative for Global Change Biology
University of California Berkeley
http://adamzeilinger.weebly.com/