Hi,


You could use over( ) function in order to compute the number of different
species.

You could also use spatstat::marktable

Some ideas here:
https://stat.ethz.ch/pipermail/r-sig-geo/2011-May/011722.html

In vegan package, you can find a Simpson and Shannon diversity calculation
function: vegan::diversity


2012/7/2 Barnabas Daru <darunabas@gmail.com>

> Dear All,
>
> I write to ask if anyone has an R code to calculate species richness per
> quarter degree grid.
>
>
>
> I have a set of polygon shapefiles showing distribution of different
> species within a country.
>
> I would like to first create quarter degree grids over the entire country
> and using the polygon shapefiles, to extract species richness per grid.
>
>
>
> Any help with R code would be highly appreciated.
>
> Barnabas Daru
>
>
>   \-/
>    /\
>   /--|
>  /---/ Barnabas Daru
>  |--/  PhD Student,
>  \-/   African Centre for DNA Barcoding,
>  /\    University of Johannesburg,
> /--\   PO Box 524, Auckland Park, 2006,
> |---\  South Africa.
>  \---\ Lab: +27 11 559 3477
>   \--| Mobile: +277 3818 9583
>    \-/ Website: http://acdb.co.za/index.php?page=mr-barnabas-h-daru
>    /\
>   /--\
>
> #…if you can think it, you can do it.
>
>
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