Geo::Shape - base class for 2-dimensional points on the earth surface
Geo::Shape is extended by
my $p1 = Geo::Point->new(lat => 2.17, ...);
my $p2 = Geo::Point->latlong(2.17, 3.14); # wgs84 is default
my $p3 = $p1->in('wgs84'); # conversion
my $p4 = $p1->in('utm'); # conversion
Base class for the many geo-spatial objects defined by the GeoPoint
- Create a new object.
proj see Geo::Proj::defaultProjection()
- Returns the nickname of the projection used by the component. Be
warned: this is not a Geo::Point object, but just a label.
- Returns the proj4 object which handles the projection.
- The coordinates of this point in a certain projection, refered to with the
$label. The projection is defined with new(). When simply 'utm' is
provided, the best UTM zone is selected.
In LIST context, the coordinates are returned. In SCALAR context, a new
object is returned.
my $gp = Geo::Point->latlong(1,2);
# implicit conversion to wgs84, if not already in latlong
my ($lat, $long) = $pr->latlong;
# will select an utm zone for you
my $p_utm = $gp->in('utm');
my ($x, $y) = $p_utm->xy;
my $label = $p_utm->proj;
my ($datum, $zone) = $label =~ m/^utm-(\w+)-(\d+)$/;
- $obj->projectOn($nick, @points)
- The @points are ARRAYs with each an X and Y coordinate of a single point
in space. A list of transformed points is returned, which is empty if no
change is needed. The returned list is preceded by the projection nick of
the result; usually the same as the provided $nick, but in some cases (for
instance UTM) it may differ.
- Returns the area covered by the geo structure. Points will return
- Returns the bounding box of the object as four coordinates, respectively
xmin, ymin, xmax, ymax. The values are expressed in the coordinate system
of the object.
- Returns a Geo::Point which represent the middle of the object. It is the
center of the bounding box. The values is cached, once computed.
Be warned that the central point in one projection system may be quite
different from the central point in some other projectionsystem .
- $obj->bboxRing([$xmin, $ymin, $xmax, $ymax, [$proj]])
- Geo::Shape->bboxRing([$xmin, $ymin, $xmax, $ymax, [$proj]])
- Returns a Geo::Line which describes the outer bounds of the object called
upon, counter-clockwise and left-bottom first. As class method, you need
to specify the limits and the PROJection.
- $obj->distance($object, [$unit])
- Calculate the distance between this object and some other object. For many
combinations of objects this is not supported or only partially supported.
This calculation is performed with Geo::Distance in accurate mode. The
default $unit is kilometers. Other units are provided in the manual page
of Geo::Distance. As extra unit, "degrees" and
"radians" are added as well as the "km" alias for
- Returns the length of the outer border of the object's components. For
points, this returns zero.
- $obj->deg2dm($degrees, $pos, $neg)
- Geo::Shape->deg2dm($degrees, $pos, $neg)
- Like deg2dms() but without showing seconds.
print $point->deg2dm(0.12, 'e', 'w');
print Geo::Shape->deg2dm(0.12, 'e', 'w');
- $obj->deg2dms($degrees, $pos, $neg)
- Geo::Shape->deg2dms($degrees, $pos, $neg)
- Translate floating point $degrees into a "degrees minutes
seconds" notation. An attempt is made to handle rounding errors.
print $point->deg2dms(-12.34, 'E', 'W');' # --> 12d20'24"W
print Geo::Shape->deg2dms(52.1234, 'E', 'W'); # --> 52d07'24"E
- Accepts for instance 3d12'24.123, 3d12"E, 3.12314w, n2.14,
s3d12", -12d34, and returns floating point degrees.
- overload: '""' (stringification)
- Returns a string "$proj($lat,$long)" or
"$proj($x,$y)". The $proj is the nickname you have assigned to
- overload: 'bool' (truth value)
- A point is always true: defined.
- Error: distance calculation not implemented between a $kind and a
- Only a subset of all objects can be used in the distance calculation. The
limitation is purely caused by lack of time to implement this.
- Error: in() not implemented for a $class
This module is part of Geo-Point distribution version 0.96, built on January 21,
2014. Website: http://perl.overmeer.net/geo/
All modules in this suite:
"Geo::Point", "Geo::Proj4", "Geo::WKT",
"Math::Polygon", "Geo::GML", "Geo::ISO19139",
"Geo::EOP", "Geo::Format::Envisat", and
Please post questions or ideas to the mailinglist at
Copyrights 2005-2014 by [Mark Overmeer]. For other contributors see ChangeLog.
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself. See