closest_point: Find closest grid point to a city location
Description
This function identifies the closest grid points in a climate model to a
city based on the city's latitude and longitude using the
Euclidean distance.
Usage
closest_point(city, latlong)
Arguments
city
A numeric vector containing the city's ID, latitude, and
longitude, in that order.
latlong
A dataframe of latitude and longitude of each
climate grid cell, with latitudes in the first column and
longitudes in the second column. The readLatLong function
re-orders the columns of longitude and latitude to comply with this
format if necessary.
Value
An index corresponding to the column in the climate projections
dataframe for that climate model that is closest to the city's
coordinates.