gis::srs::Projected_srs Class Reference

A projected spatial reference system. More...

#include <srs.h>

Inheritance diagram for gis::srs::Projected_srs:

Public Member Functions
	Projected_srs ()
Srs_type	srs_type () const override
	Get the type of spatial reference system: projected, geometric, etc. More...
virtual bool	init (srid_t srid, wkt_parser::Projected_cs *p)
	Initialize from parse tree. More...
virtual Projection_type	projection_type () const =0
	Get the map projection method. More...
Axis_direction	axis_direction (const int axis) const override
	Retrieve the axis direction of the spatial reference system. More...
double	linear_unit () const override
	Retrieve how long the unit of the spatial reference system is in meters. More...
double	angular_unit () const override
	Retrieve the angular unit relative to radians. More...
double	prime_meridian () const override
	Retrieve the prime meridian relative to Greenwich. More...
bool	has_towgs84 () const override
	Checks if this SRS has valid Bursa Wolf parameters. More...
bool	is_wgs84_based () const override
	Checks if this SRS is WGS 84 or a projection based on WGS 84. More...
std::string	partial_proj4_parameters () const
Public Member Functions inherited from gis::srs::Spatial_reference_system
	Spatial_reference_system ()=default
	Spatial_reference_system (const Spatial_reference_system &)=default
	Spatial_reference_system (Spatial_reference_system &&)=default
virtual	~Spatial_reference_system ()=default
virtual Spatial_reference_system *	clone ()=0
	Clone the object. More...
virtual bool	can_be_modified_to (const Spatial_reference_system &srs) const =0
	Checks if this SRS can be changed to another SRS without causing computational incompatibilities. More...
virtual std::string	proj4_parameters () const
	Retrieve the proj4 parameter string. More...

Protected Member Functions
bool	common_proj_parameters_can_be_modified_to (const Spatial_reference_system &srs) const
	Checks if the parameters that are common to all projections can safely be modified to another SRS without causing computational differences. More...

Private Attributes
Geographic_srs	m_geographic_srs
	The geographic SRS this SRS is projected from. More...
double	m_linear_unit
	Converson factor for the linar unit relative to meters. More...
Axis_direction	m_axes [2]
	Direction of x and y axis, respectively. More...

Detailed Description

A projected spatial reference system.

Constructor & Destructor Documentation

Projected_srs()

gis::srs::Projected_srs::Projected_srs ( )

inline

Member Function Documentation

angular_unit()

double gis::srs::Projected_srs::angular_unit ( ) const

inlineoverridevirtual

Retrieve the angular unit relative to radians.

Returns

Conversion factor.

Implements gis::srs::Spatial_reference_system.

axis_direction()

Axis_direction gis::srs::Projected_srs::axis_direction ( const int  axis ) const

inlineoverridevirtual

Retrieve the axis direction of the spatial reference system.

Parameters

axis	axis number, zero indexed

Returns

Axis direction

Implements gis::srs::Spatial_reference_system.

common_proj_parameters_can_be_modified_to()

bool gis::srs::Projected_srs::common_proj_parameters_can_be_modified_to ( const Spatial_reference_system &  srs ) const

protected

Checks if the parameters that are common to all projections can safely be modified to another SRS without causing computational differences.

This function is called by can_be_modified_to() in subclasses to check if the common parameters match. Projected_srs::can_be_modified_to is abstract to avoid that subclasses forget to implement can_be_modified_to().

See also

Spatial_reference_system::can_be_modified_to

Parameters

srs	The SRS to compare with.

Return values

true	The common projection parameters are the same in both SRSs.
false	The two SRSs differ in the common projection parameters.

has_towgs84()

bool gis::srs::Projected_srs::has_towgs84 ( ) const

inlineoverridevirtual

Checks if this SRS has valid Bursa Wolf parameters.

Return values

true	Transformation parameters are specified.
false	Transformation parameters are not specified.

Implements gis::srs::Spatial_reference_system.

init()

bool gis::srs::Projected_srs::init ( gis::srid_t  srid, wkt_parser::Projected_cs *  p  )

virtual

Initialize from parse tree.

Parameters

[in]	srid	Spatial reference system ID to use when reporting errors
[in]	p	Parser output

Return values

true	An error has occurred. The error has been flagged.
false	Success

Reimplemented in gis::srs::Unknown_projected_srs, gis::srs::Popular_visualisation_pseudo_mercator_srs, gis::srs::Lambert_azimuthal_equal_area_spherical_srs, gis::srs::Equidistant_cylindrical_srs, gis::srs::Equidistant_cylindrical_spherical_srs, gis::srs::Krovak_north_orientated_srs, gis::srs::Krovak_modified_srs, gis::srs::Krovak_modified_north_orientated_srs, gis::srs::Lambert_conic_conformal_2sp_michigan_srs, gis::srs::Colombia_urban_srs, gis::srs::Lambert_conic_conformal_1sp_srs, gis::srs::Lambert_conic_conformal_2sp_srs, gis::srs::Lambert_conic_conformal_2sp_belgium_srs, gis::srs::Mercator_variant_a_srs, gis::srs::Mercator_variant_b_srs, gis::srs::Cassini_soldner_srs, gis::srs::Transverse_mercator_srs, gis::srs::Transverse_mercator_south_orientated_srs, gis::srs::Oblique_stereographic_srs, gis::srs::Polar_stereographic_variant_a_srs, gis::srs::New_zealand_map_grid_srs, gis::srs::Hotine_oblique_mercator_variant_a_srs, gis::srs::Laborde_oblique_mercator_srs, gis::srs::Hotine_oblique_mercator_variant_b_srs, gis::srs::Tunisia_mining_grid_srs, gis::srs::Lambert_conic_near_conformal_srs, gis::srs::American_polyconic_srs, gis::srs::Krovak_srs, gis::srs::Lambert_azimuthal_equal_area_srs, gis::srs::Albers_equal_area_srs, gis::srs::Transverse_mercator_zoned_grid_system_srs, gis::srs::Lambert_conic_conformal_west_orientated_srs, gis::srs::Bonne_south_orientated_srs, gis::srs::Polar_stereographic_variant_b_srs, gis::srs::Polar_stereographic_variant_c_srs, gis::srs::Guam_projection_srs, gis::srs::Modified_azimuthal_equidistant_srs, gis::srs::Hyperbolic_cassini_soldner_srs, gis::srs::Lambert_cylindrical_equal_area_spherical_srs, and gis::srs::Lambert_cylindrical_equal_area_srs.

is_wgs84_based()

bool gis::srs::Projected_srs::is_wgs84_based ( ) const

inlineoverridevirtual

Checks if this SRS is WGS 84 or a projection based on WGS 84.

Return values

true	This SRS is WGS 84 or a projection of WGS 84.
false	This SRS is neither WGS 84 or a projection of WGS 84.

Implements gis::srs::Spatial_reference_system.

linear_unit()

double gis::srs::Projected_srs::linear_unit ( ) const

inlineoverridevirtual

Retrieve how long the unit of the spatial reference system is in meters.

Returns

Conversion factor

Implements gis::srs::Spatial_reference_system.

partial_proj4_parameters()

std::string gis::srs::Projected_srs::partial_proj4_parameters ( ) const

inline

prime_meridian()

double gis::srs::Projected_srs::prime_meridian ( ) const

inlineoverridevirtual

Retrieve the prime meridian relative to Greenwich.

The prime meridian is returned in the angular unit of the SRS. Positive numbers are East of Greenwich.

See also

angular_unit

Returns

Prime meridian.

Implements gis::srs::Spatial_reference_system.

projection_type()

virtual Projection_type gis::srs::Projected_srs::projection_type ( ) const

pure virtual

Get the map projection method.

Returns

Projection type

Implemented in gis::srs::Unknown_projected_srs, gis::srs::Popular_visualisation_pseudo_mercator_srs, gis::srs::Lambert_azimuthal_equal_area_spherical_srs, gis::srs::Equidistant_cylindrical_srs, gis::srs::Equidistant_cylindrical_spherical_srs, gis::srs::Krovak_north_orientated_srs, gis::srs::Krovak_modified_srs, gis::srs::Krovak_modified_north_orientated_srs, gis::srs::Lambert_conic_conformal_2sp_michigan_srs, gis::srs::Colombia_urban_srs, gis::srs::Lambert_conic_conformal_1sp_srs, gis::srs::Lambert_conic_conformal_2sp_srs, gis::srs::Lambert_conic_conformal_2sp_belgium_srs, gis::srs::Mercator_variant_a_srs, gis::srs::Mercator_variant_b_srs, gis::srs::Cassini_soldner_srs, gis::srs::Transverse_mercator_srs, gis::srs::Transverse_mercator_south_orientated_srs, gis::srs::Oblique_stereographic_srs, gis::srs::Polar_stereographic_variant_a_srs, gis::srs::New_zealand_map_grid_srs, gis::srs::Hotine_oblique_mercator_variant_a_srs, gis::srs::Laborde_oblique_mercator_srs, gis::srs::Hotine_oblique_mercator_variant_b_srs, gis::srs::Tunisia_mining_grid_srs, gis::srs::Lambert_conic_near_conformal_srs, gis::srs::American_polyconic_srs, gis::srs::Krovak_srs, gis::srs::Lambert_azimuthal_equal_area_srs, gis::srs::Albers_equal_area_srs, gis::srs::Transverse_mercator_zoned_grid_system_srs, gis::srs::Lambert_conic_conformal_west_orientated_srs, gis::srs::Bonne_south_orientated_srs, gis::srs::Polar_stereographic_variant_b_srs, gis::srs::Polar_stereographic_variant_c_srs, gis::srs::Guam_projection_srs, gis::srs::Modified_azimuthal_equidistant_srs, gis::srs::Hyperbolic_cassini_soldner_srs, gis::srs::Lambert_cylindrical_equal_area_spherical_srs, and gis::srs::Lambert_cylindrical_equal_area_srs.

srs_type()

Srs_type gis::srs::Projected_srs::srs_type ( ) const

inlineoverridevirtual

Get the type of spatial reference system: projected, geometric, etc.

Returns

SRS type

Implements gis::srs::Spatial_reference_system.

Member Data Documentation

m_axes

Axis_direction gis::srs::Projected_srs::m_axes[2]

private

Direction of x and y axis, respectively.

m_geographic_srs

Geographic_srs gis::srs::Projected_srs::m_geographic_srs

private

The geographic SRS this SRS is projected from.

m_linear_unit

double gis::srs::Projected_srs::m_linear_unit

private

Converson factor for the linar unit relative to meters.

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The documentation for this class was generated from the following files:

• sql/gis/srs/srs.h
• sql/gis/srs/srs.cc