Geo::Surface(3pm) User Contributed Perl Documentation Geo::Surface(3pm)
NAME
Geo::Surface - A surface description.
INHERITANCE
Geo::Surface
is a Geo::Shape
SYNOPSIS
my $island = Geo::Surface->new($outer, $lake1, $lake2);
DESCRIPTION
In this context, a "surface" is defined as one filled area with possible enclosures in one projection system.
METHODS
Constructors
Geo::Surface->new((SURFACE|(OUTER,INNER,...)), [OPTIONS])
When called as instance method, some defaults are copied from the object where the call is made upon.
You may either provide a Math::Polygon::Surface SURFACE, or a LIST of lines. In the latter case, the first line is the OUTER polygon
of the surface, and the other are all INNER enclosures: lakes. Lines are and Geo::Line, Math::Polygon objects, or ARRAY of points.
If no projection is specified, then the projection of the first Geo-encoded line will be used.
Option--Defined in--Default
proj Geo::Shape see Geo::Proj::defaultProjection()
. proj => LABEL
Attributes
$obj->geoInner
Returns a LIST of enclosed polygons, converted to Geo::Line objects.
$obj->geoOuter
Returns the outer polygon as Geo::Line object.
$obj->inner
Returns a LIST of enclosed Math::Polygon objects.
$obj->outer
Returns the outer Math::Polygon.
$obj->proj
See "Attributes" in Geo::Shape
$obj->proj4
See "Attributes" in Geo::Shape
Projections
$obj->in(LABEL|'utm')
See "Projections" in Geo::Shape
$obj->projectOn(NICK, POINTS)
See "Projections" in Geo::Shape
Geometry
$obj->area
Returns the area enclosed by the outer polygon, minus the erea of the enclosures. Only useful when the points are in some orthogonal
projection.
$obj->bbox
The bounding box of outer surface polygon.
$obj->bboxCenter
See "Geometry" in Geo::Shape
$obj->bboxRing([XMIN, YMIN, XMAX, YMAX, [PROJ]])
Geo::Surface->bboxRing([XMIN, YMIN, XMAX, YMAX, [PROJ]])
See "Geometry" in Geo::Shape
$obj->distance(OBJECT, [UNIT])
See "Geometry" in Geo::Shape
$obj->perimeter
The length of the outer polygon. Only useful in a orthogonal coordinate systems.
Display
$obj->deg2dm(DEGREES, POS, NEG)
Geo::Surface->deg2dm(DEGREES, POS, NEG)
See "Display" in Geo::Shape
$obj->deg2dms(DEGREES, POS, NEG)
Geo::Surface->deg2dms(DEGREES, POS, NEG)
See "Display" in Geo::Shape
$obj->dms2deg(DMS)
Geo::Surface->dms2deg(DMS)
See "Display" in Geo::Shape
$obj->toString([PROJECTION])
Returns a string representation of the line, which is also used for stringification.
DIAGNOSTICS
Warning: Geo::Line is should be filled
When Geo::Line objects are used to compose a surface, each of them must be filled. Representation of rivers and such do not belong in
a surface description.
Error: distance calculation not implemented between a $kind and a $kind
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
Error: not known what to do with $component
SEE ALSO
This module is part of Geo-Point distribution version 0.93, built on May 19, 2010. 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
"Geo::Format::Landsat".
Please post questions or ideas to the mailinglist at http://geo-perl@list.hut.fi
LICENSE
Copyrights 2005-2010 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
http://www.perl.com/perl/misc/Artistic.html
perl v5.14.2 2010-05-19 Geo::Surface(3pm)