match_env: Match biotic and abiotic data in space
In remsamp/Rmerp_public:

The function takes two sets of geolocated data (typically one biotic and one abiotic) and match their locations to combine the two. match_env returns the value of the environmental variable for the location in the abiotic set of coordinates that is closest to the location for the biotic record. If the vector of values for the abiotic variable is not provided, the function simply returns the index of the closest location in the vector of coordinates.

1 2	match_env(env_lon, env_lat, bio_lon, bio_lat, max_dist = NA, env_variable = NULL)

`env_lon`	is a vector of longitudes for the abiotic variable
`env_lat`	is a vector of latitude for the abiotic variable
`bio_lon`	is the longitude of the biotic variable
`bio_lat`	is the latitude of the biotic variable
`max_dist`	is the maximum distance (in km) beyond which a environmental data point is considered too far to inform conditions at location of biological records
`env_variable`	is an optional vector containing the value of the abiotic variable