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 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()

proj => LABEL

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

LICENSE

Copyrights 2005-2019 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/

2019-02-21

perl v5.28.1