NAME

Geo::JSON::CRS - Co-ordinate Reference System object

SYNOPSIS

            

              
              
use Geo::JSON::CRS;
# A named CRS
my $wgs84 = Geo::JSON::CRS->new(
    {   type       => 'name',
        properties => { name => 'urn:ogc:def:crs:OGC:1.3:CRS84' }
    }
);
# older formats are also possible, e.g. "urn:ogc:def:crs:EPSG::4326"
# A linked CRS
my $crs = Geo::JSON::CRS->new(
    {   type       => 'link',
        properties => {
            href => 'http://example.com/crs/42',
            type => 'proj4'
        }
    }
);
# A relative link
my $crs = Geo::JSON::CRS->new(
    {   type       => 'link',
        properties => {
            href => 'data.crs',
            type => 'ogcwkt'
        }
    }
);
            
          

DESCRIPTION

Perl class to represent a Coordinate Reference System object. The default GeoJSON CRS "is a geographic coordinate reference system, using the WGS84 datum, and with longitude and latitude units of decimal degrees."

Set a CRS value on a GeoJSON object to change this.

See Geo::JSON for more details.

ATTRIBUTES

type

Either 'name' or 'link'

properties

Hashref.

For objects of type 'name', a 'name' key is required, the value being a string identifying the CRS.

For objects of type 'link', 'href' and 'type' keys are required. Link types are not restricted, examples include "proj4", "ogcwkt", "esriwkt",