It returns a ggplot object and exports a .jpeg image with
the locations map. Images will be saved under a new directory, called
POLARISOut. The directory will be created within the localPath
and used to store the raster images from the POLARIS database.
Details
This function is useful for checking if locations were correctly
informed, but its output is not required by ximages or xsoil. If a
given location falls in the border of an image (round coordinates),
the function will make sure a minimum number of images is downloaded.