Class: RGeo::CoordSys::CS::HorizontalDatum

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

Overview

OGC spec description

Procedure used to measure positions on the surface of the Earth.

Instance Attribute Summary collapse

Attributes inherited from Datum

#datum_type

Attributes inherited from Info

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

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#_to_wkt, #eql?, #inspect, #to_s, #to_wkt

Constructor Details

#initialize(name_, datum_type_, ellipsoid_, wgs84_parameters_, *optional_) ⇒ HorizontalDatum

:nodoc:



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# File 'lib/rgeo/coord_sys/cs/entities.rb', line 868

def initialize(name_, datum_type_, ellipsoid_, wgs84_parameters_, *optional_)  # :nodoc:
  super(name_, datum_type_, *optional_)
  @ellipsoid = ellipsoid_
  @wgs84_parameters = wgs84_parameters_
end

Instance Attribute Details

#ellipsoid ⇒ Object (readonly)

Returns the Ellipsoid.



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# File 'lib/rgeo/coord_sys/cs/entities.rb', line 876

def ellipsoid
  @ellipsoid
end

#wgs84_parameters ⇒ Object (readonly)

Gets preferred parameters for a Bursa Wolf transformation into WGS84. The 7 returned values correspond to (dx,dy,dz) in meters, (ex,ey,ez) in arc-seconds, and scaling in parts-per-million.



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# File 'lib/rgeo/coord_sys/cs/entities.rb', line 881

def wgs84_parameters
  @wgs84_parameters
end

Class Method Details

.create(name_, datum_type_, ellipsoid_, wgs84_parameters_, *optional_) ⇒ Object

Create a HorizontalDatum given a name, datum type code, Ellipsoid, and WGS84ConversionInfo. The WGS84ConversionInfo is optional and may be set to nil. You may also provide the optional parameters specified by the Info interface.



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# File 'lib/rgeo/coord_sys/cs/entities.rb', line 903

def create(name_, datum_type_, ellipsoid_, wgs84_parameters_, *optional_)
  new(name_, datum_type_, ellipsoid_, wgs84_parameters_, *optional_)
end

Instance Method Details

#_wkt_content(open_, close_) ⇒ Object

:nodoc:



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# File 'lib/rgeo/coord_sys/cs/entities.rb', line 888

def _wkt_content(open_, close_)  # :nodoc:
  array_ = [@ellipsoid._to_wkt(open_, close_)]
  array_ << @wgs84_parameters._to_wkt(open_, close_) if @wgs84_parameters
  array_
end

#_wkt_typename ⇒ Object

:nodoc:



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# File 'lib/rgeo/coord_sys/cs/entities.rb', line 884

def _wkt_typename  # :nodoc:
  "DATUM"
end