Returns the region names containing given locations.
Usage
map.where(database = "world", x, y, ...)
Arguments
- database
character string naming a geographical database, or a list of
x, y, and names.
See the documentation for map for more details.
- x
vector of longitudes.
- y
vector of latitudes.
- ...
Options for SpatialPolygons2map, only used if database is of type SpatialPolygonsDataFrame
.
Value
A list of character strings, naming the map region that each
(longitude, latitude) pair falls into.
Note
For points close to a border (polygon boundary), the result may be wrong if the
resolution of the database is insufficient.
This function may also give erroneous results if the database contains
enclaves. For instance, a point in San Marino may also be identified
as being in Italy.
Examples
# NYC
map.where("state", -73.8, 41)
# Auckland
map.where("nz", 174.6, -36.92)
# find both in the world
map.where(x = c(174.6, -73.8), y = c(-36.92, 41))
# with a map object:
m = map("state", "new york", fill = TRUE, plot = FALSE)
map.where(m, -73.8, 41)