NAME
Geo::Surface - A surface description.
INHERITANCE
Geo::Surface
is a Geo::ShapeSYNOPSIS
my $island = Geo::Surface->new($outer, $lake1, $lake2);DESCRIPTION
In this context, a "surface" is defined as a single filled area with possible enclosures in one projection system.
Extends "DESCRIPTION" in Geo::Shape.
METHODS
Extends "METHODS" in Geo::Shape.
Constructors
Extends "Constructors" in Geo::Shape.
- $obj->new( <$surface | <$outer,$inner,...> >, %options )
- 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()
Attributes
Extends "Attributes" in Geo::Shape.
- $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()
-
Inherited, see "Attributes" in Geo::Shape
- $obj->proj4()
-
Inherited, see "Attributes" in Geo::Shape
Projections
Extends "Projections" in Geo::Shape.
- $obj->in( <$label|'utm'> )
-
Inherited, see "Projections" in Geo::Shape
- $obj->projectOn($nick, @points)
-
Inherited, see "Projections" in Geo::Shape
Geometry
Extends "Geometry" in Geo::Shape.
- $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()
-
Inherited, see "Geometry" in Geo::Shape
- $obj->bboxRing( [$xmin, $ymin, $xmax, $ymax, [$proj]] )
- Geo::Surface->bboxRing( [$xmin, $ymin, $xmax, $ymax, [$proj]] )
-
Inherited, see "Geometry" in Geo::Shape
- $obj->distance( $object, [$unit] )
-
Inherited, see "Geometry" in Geo::Shape
- $obj->perimeter()
-
The length of the outer polygon. Only useful in a orthogonal coordinate systems.
Display
Extends "Display" in Geo::Shape.
- $obj->deg2dm($degrees, $pos, $neg)
- Geo::Surface->deg2dm($degrees, $pos, $neg)
-
Inherited, see "Display" in Geo::Shape
- $obj->deg2dms($degrees, $pos, $neg)
- Geo::Surface->deg2dms($degrees, $pos, $neg)
-
Inherited, see "Display" in Geo::Shape
- $obj->dms2deg($dms)
- Geo::Surface->dms2deg($dms)
-
Inherited, see "Display" in Geo::Shape
- $obj->toString( [$projection] )
-
Returns a string representation of the line, which is also used for stringification.
OVERLOAD
Extends "OVERLOAD" in Geo::Shape.
- overload: '""' (stringification)
-
Inherited, see "OVERLOAD" in Geo::Shape
- overload: 'bool' (truth value)
-
Inherited, see "OVERLOAD" in Geo::Shape
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 0.99, built on February 09, 2021. Website: http://perl.overmeer.net/CPAN/
LICENSE
Copyrights 2005-2021 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://dev.perl.org/licenses/