Hi,
What R package provides a way to determine if a longitude/latitude
coordinate is situated inside a closed, complex spherical polygon (i.e., a
point inside a polygon on Earth's surface)?
For example:
p <- rbind( c(-123.4447,48.5146), c(-123.3171,48.5128),
c(-123.2607,48.4108), c(-123.4018,48.4099), c(-123.4447,48.5146) )
ll <- c(-123.3501,48.4902)
print( isInside( ll, p ) )
I have looked at the following packages:
- geosphere
- GEOmap
I could not find anything else at CRAN that looked suitable.
A good article on the subject is at:
trs-new.jpl.nasa.gov/dspace/bitstream/2014/40409/1/07-03.pdf
Thank you!
Dave
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