module RGeo::Feature::MultiSurface

SFS 1.1 Description

A MultiSurface is a 2-dimensional GeometryCollection whose elements are Surfaces. The interiors of any two Surfaces in a MultiSurface may not intersect. The boundaries of any two elements in a MultiSurface may intersect, at most, at a finite number of Points.

MultiSurface is a non-instantiable class in this International Standard. It defines a set of methods for its subclasses and is included for reasons of extensibility. The instantiable subclass of MultiSurface is MultiPolygon, corresponding to a collection of Polygons.

Notes

MultiSurface 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.

Public Instance Methods

area() click to toggle source

SFS 1.1 Description

The area of this MultiSurface, as measured in the spatial reference system of this MultiSurface.

Notes

Returns a floating-point scalar value.

# File lib/rgeo/feature/multi_surface.rb, line 78
def area
  raise Error::UnsupportedOperation, "Method MultiSurface#area not defined."
end

centroid() click to toggle source

SFS 1.1 Description

The mathematical centroid for this MultiSurface as a Point. The result is not guaranteed to be on this MultiSurface.

Notes

Returns an object that supports the Point interface.

# File lib/rgeo/feature/multi_surface.rb, line 92
def centroid
  raise Error::UnsupportedOperation, "Method MultiSurface#centroid not defined."
end

point_on_surface() click to toggle source

SFS 1.1 Description

A Point guaranteed to be on this MultiSurface.

Notes

Returns an object that supports the Point interface.

# File lib/rgeo/feature/multi_surface.rb, line 105
def point_on_surface
  raise Error::UnsupportedOperation, "Method MultiSurface#point_on_surface not defined."
end