Dear Bruce,
the old 'sp' package and the new 'sf' package support vector type (i.e.
polygons, points etc.) spatial data, while package 'raster' handles
rater type data.
You might use the following functions:
raster::extract() - extracts values from a raster at the locations of
other spatial data
raster::mask() - masks a raster with a raster or vector
raster::focal() - moving window extraction on a raster
sp::over() or %over% - see this vignette:
https://cran.r-project.org/web/packages/sp/vignettes/over.pdf
You may need package 'rgeos' for the overlapping.
sf::st_join() - spatial left or inner join
Binary geometric operations in package 'sf':
https://r-spatial.github.io/sf/reference/geos_binary_ops.html
Binary geometric predicates in package 'sf':
https://r-spatial.github.io/sf/reference/geos_binary_pred.html
Also see this page:
https://cran.r-project.org/web/packages/sf/vignettes/sf3.html#geometrical_operations
HTH,
Ákos Bede-Fazekas
Hungarian Academy of Sciences
2019.01.15. 13:22 keltezéssel, Bruce Miller írta:
Hi all,
I am on the road away from my office and do not have ArcMap on my lap
top.
I need to extract associations i.e. overlap of species distribution
polygons with habitat and other polygons.
I have looked at Hawthorne's older Geospatial Modelling Environment
and look for other spatial packages but can not find one that will
extract the overlap.
Any ideas or suggestions?
Cheers,
Bruce Miller
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