Module: RGeo::Feature::Surface
Overview
SFS 1.1 Description
A Surface is a 2dimensional geometric object.
A simple Surface consists of a single “patch” that is associated with one “exterior boundary” and 0 or more “interior” boundaries. Simple Surfaces in 3dimensional space are isomorphic to planar Surfaces. Polyhedral Surfaces are formed by “stitching” together simple Surfaces along their boundaries, polyhedral Surfaces in 3dimensional space may not be planar as a whole.
The boundary of a simple Surface is the set of closed Curves corresponding to its “exterior” and “interior” boundaries.
The only instantiable subclass of Surface defined in this specification, Polygon, is a simple Surface that is planar.
Notes
Surface is defined as a module and is provided primarily for the sake of documentation. Implementations need not necessarily include this module itself. Therefore, you should not depend on the kind_of? method to check type. Instead, use the provided check_type class method (or === operator) defined in the Type module.
Some implementations may support higher dimensional points.
Instance Method Summary collapse

#area ⇒ Object
SFS 1.1 Description.

#centroid ⇒ Object
SFS 1.1 Description.

#point_on_surface ⇒ Object
SFS 1.1 Description.
Methods included from Type
add_subtype, check_type, each_immediate_subtype, extended, subtype_of?, supertype, type_name
Methods included from Geometry
#*, #+, #, #==, #as_binary, #as_text, #boundary, #buffer, #contains?, #convex_hull, #crosses?, #difference, #dimension, #disjoint?, #distance, #envelope, #eql?, #equals?, #factory, #geometry_type, #intersection, #intersects?, #is_empty?, #is_simple?, #overlaps?, #relate?, #rep_equals?, #srid, #sym_difference, #touches?, #unary_union, #union, #within?
Instance Method Details
#area ⇒ Object
SFS 1.1 Description
The area of this Surface, as measured in the spatial reference system of this Surface.
Notes
Returns a floatingpoint scalar value.
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# File 'lib/rgeo/feature/surface.rb', line 51 def area raise Error::UnsupportedOperation, "Method Surface#area not defined." end 
#centroid ⇒ Object
SFS 1.1 Description
The mathematical centroid for this Surface as a Point. The result is not guaranteed to be on this Surface.
Notes
Returns an object that supports the Point interface.
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# File 'lib/rgeo/feature/surface.rb', line 64 def centroid raise Error::UnsupportedOperation, "Method Surface#centroid not defined." end 
#point_on_surface ⇒ Object
SFS 1.1 Description
A Point guaranteed to be on this Surface.
Notes
Returns an object that supports the Point interface.
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# File 'lib/rgeo/feature/surface.rb', line 76 def point_on_surface raise Error::UnsupportedOperation, "Method Surface#point_on_surface not defined." end 