[R-sig-Geo] focal analysis on raster

[Bede-Fazekas Ákos]

Dear Jeff,
1. raster::extract(Raster*, SpatialPoints*)
2. raster::extract(Raster*, rgeos::gBuffer(SpatialPoints*, width, byid = 
TRUE))
If your points are Simple Features, use sf::st_buffer(x, dist) instead 
of rgeos::gBuffer().

HTH,
Ákos Bede-Fazekas
Hungarian Academy of Sciences

2019.05.23. 3:56 keltezéssel, Stratford, Jeff via R-sig-Geo írta:
> Hi everyone,
>
> I am looking to estimate the number of pixels to quantify different
> landuses around sampling points for different projects (bird diversity,
> nests, predation rates on clay caterpillars, etc). Our base map is a
> Landsat 7 map.
>
> I can plot our sample points and plot the Landsat map (using raster) but
> I'm not sure
>
> 1. How to overlay the sample points onto the Landsat map
> 2. How to do the focal analysis using the sample points as centers in
> circular buffers of 200 and 1000 m radii
>
> Any help would be greatly appreciated.
>
> Many thanks,
>
> Jeff
>
> ********************************************************
> Jeffrey A. Stratford, PhD
> Department of Biology and Health Sciences &
> Director of Study Abroad
> Office: Cohen Science Center 210
> Address: 84 W South Street
> Wilkes University, PA 18766 USA
> https://sites.google.com/a/wilkes.edu/stratford/home
> Blog https://wordpress.com/posts/concreteornithology.blog
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