Class: RGeo::CoordSys::CS::LocalCoordinateSystem

Inherits:
CoordinateSystem show all
Defined in:
lib/rgeo/coord_sys/cs/entities.rb

Overview

OGC spec description

A local coordinate system, with uncertain relationship to the world. In general, a local coordinate system cannot be related to other coordinate systems. However, if two objects supporting this interface have the same dimension, axes, units and datum then client code is permitted to assume that the two coordinate systems are identical. This allows several datasets from a common source (e.g. a CAD system) to be overlaid. In addition, some implementations of the Coordinate Transformation (CT) package may have a mechanism for correlating local datums. (E.g. from a database of transformations, which is created and maintained from real-world measurements.)

Notes

RGeo’s implementation does not provide the Coordinate Transformation (CT) package.

Instance Attribute Summary collapse

Attributes inherited from CoordinateSystem

#dimension

Attributes inherited from Info

#abbreviation, #alias, #authority, #authority_code, #name, #remarks

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Info

#extension

Methods inherited from Base

#_to_wkt, #encode_with, #eql?, #hash, #init_with, #inspect, #marshal_dump, #marshal_load, #to_s, #to_wkt

Constructor Details

#initialize(name_, local_datum_, unit_, axes_, *optional_) ⇒ LocalCoordinateSystem

:nodoc:



991
992
993
994
995
996
 
# File 'lib/rgeo/coord_sys/cs/entities.rb', line 991

def initialize(name_, local_datum_, unit_, axes_, *optional_) # :nodoc:
  super(name_, axes_.size, *optional_)
  @local_datum = local_datum_
  @unit = unit_
  @axes = axes_.dup
end

Instance Attribute Details

#local_datum ⇒ Object (readonly)

Gets the local datum.



999
1000
1001
 
# File 'lib/rgeo/coord_sys/cs/entities.rb', line 999

def local_datum
  @local_datum
end

Class Method Details

.create(name_, local_datum_, unit_, axes_, *optional_) ⇒ Object

Create a LocalCoordinateSystem given a name, a LocalDatum, a Unit, and an array of at least one AxisInfo. You may also provide the optional parameters specified by the Info interface.



1027
1028
1029
 
# File 'lib/rgeo/coord_sys/cs/entities.rb', line 1027

def create(name_, local_datum_, unit_, axes_, *optional_)
  new(name_, local_datum_, unit_, axes_, *optional_)
end

Instance Method Details

#_wkt_content(open_, close_) ⇒ Object

:nodoc:



1017
1018
1019
 
# File 'lib/rgeo/coord_sys/cs/entities.rb', line 1017

def _wkt_content(open_, close_) # :nodoc:
  [@local_datum._to_wkt(open_, close_), @unit._to_wkt(open_, close_)] + @axes.map { |ax_| ax_._to_wkt(open_, close_) }
end

#_wkt_typename ⇒ Object

:nodoc:



1013
1014
1015
 
# File 'lib/rgeo/coord_sys/cs/entities.rb', line 1013

def _wkt_typename # :nodoc:
  "LOCAL_CS"
end

#get_axis(index_) ⇒ Object

Implements CoordinateSystem#get_axis



1003
1004
1005
 
# File 'lib/rgeo/coord_sys/cs/entities.rb', line 1003

def get_axis(index_)
  @axes[index_]
end

#get_units(_index_) ⇒ Object

Implements CoordinateSystem#get_units



1009
1010
1011
 
# File 'lib/rgeo/coord_sys/cs/entities.rb', line 1009

def get_units(_index_)
  @unit
end