Excluding coordinates that fall within a circle
I'm no expert here but I have recently been playing with the package
'geosphere' it contains plenty of options to calculate distance
between two coordinates specified as lat and long.
install.packages('geosphere') # only needed once
library(geosphere)
coord1 <- c(43.60923,-79.322799)
coord2 <- c(43.683266,-79.323703)
distHaversine(coord1,coord2)
Once you have a vector of distances you can then filter your df
df <- df[df$distance < radius,]
On Fri, Jun 17, 2016 at 1:26 PM, Alice Domalik <adomalik at sfu.ca> wrote:
Hi List,
I'm working with some bird tracking data, and to filter the data set, I need to exclude points taken at the colony.
I would like to exclude coordinates from within a 500 meter radius of a point centered on the colony.
However, as an R novice, I'm not sure how to accomplish this.
My df looks like this:
AnimalID Latitude Longitude Datetime
Any suggestions would be greatly appreciated.
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