MySQL 8.1.0
Source Code Documentation

A projected SRS of an unknown projection type. More...
#include <srs.h>
Public Member Functions  
Spatial_reference_system *  clone () override 
Clone the object. More...  
bool  init (srid_t srid, wkt_parser::Projected_cs *p) override 
Initialize from parse tree. More...  
Projection_type  projection_type () const override 
Get the map projection method. More...  
bool  can_be_modified_to (const Spatial_reference_system &) const override 
Checks if this SRS can be changed to another SRS without causing computational incompatibilities. More...  
Public Member Functions inherited from gis::srs::Projected_srs  
Projected_srs ()  
Srs_type  srs_type () const override 
Get the type of spatial reference system: projected, geometric, etc. 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 std::string  proj4_parameters () const 
Retrieve the proj4 parameter string. More...  
Additional Inherited Members  
Protected Member Functions inherited from gis::srs::Projected_srs  
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...  
A projected SRS of an unknown projection type.
This SRS can be used as any other projected SRS, but since the projection type is unknown, geometries in this SRS can't be transformed to other SRSs.

inlineoverridevirtual 
Checks if this SRS can be changed to another SRS without causing computational incompatibilities.
This means checking that all values in the two SRSs that affect computations are the same. The syntax of the SRS definitions may still vary, e.g., by using different names or by having different authority codes.
In some cases, e.g., unknown projection methods, we don't know how to compare the two SRSs. In that case, we fail by saying that the SRSs are not the same.
The operation is not commutative. The SRS parameter is allowed to have a TOWGS84 specification even though this object doesn't. The opposite is not necessarily true. If this object lacks TOWGS84 information, transformation operations are forbidden on this SRS. Adding that possibility changes what computations are available, but it doesn't change the result of any computation that can currently be done.
An SRS that is currently identified as WGS 84 may both add and remove TOWGS84 information as long as the parameters are all 0. Adding a nonallzero TOWGS84 clause to a WGS 84 SRS is not allowed.
srs  The SRS to compare with. 
true  The two SRSs are semantically the same. 
false  The two SRSs are semantically different, or we don't know how to compare them. 
Implements gis::srs::Spatial_reference_system.

inlineoverridevirtual 
Clone the object.
Implements gis::srs::Spatial_reference_system.

overridevirtual 
Initialize from parse tree.
[in]  srid  Spatial reference system ID to use when reporting errors 
[in]  p  Parser output 
true  An error has occurred. The error has been flagged. 
false  Success 
Reimplemented from gis::srs::Projected_srs.

inlineoverridevirtual 