Hi all,
I am still searching for a way to extract associations between 2 vector
polygon layers using R.
What I need is information on if this is possible and if so which
packages to use and a basic set of code to do what I can run in the GIS
software.
For each iteration I have a vector polygon of a bat species distributions.
Depending on the country the number of these can range from only a
dozen to > 150 species distribution shape files.
What I need to do is use the most current habitat/ecosystem vector
layers for each geographic area and then extract the species overlapping
values. This creates a new shape file that has added to the species
data table all values for the ecosystem where the species polygons
overlap the ecosystem polygons. This provides habitat associations for
each species.
Then the table is exported to Excel and the data is used for Interactive
Identification Keys for New World Bat calls.
This eliminates species that do not occur in a given ecosystem as people
work on IDing their bats form acoustic surveys.
I assume this can be accomplished using R.
I have a new ecosystem data set of polygons for Peru, for example that
is very detailed. I extracted one species late yesterday.
It took >8 hours in the GIS to compile the areas where the species
distribution and ecosystem areas overlapped!
I would like to do this in R as a batch file and run on another computer
so not to tie up my main workstation.
Any guidance or suggestions welcomed.
Bruce
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