MySQL 9.0.0
Source Code Documentation
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A Guam Projection projection (EPSG 9831). More...
#include <srs.h>
Public Member Functions | |
Guam_projection_srs () | |
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... | |
std::string | proj4_parameters () const override |
Retrieve the proj4 parameter string. 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 |
Private Attributes | |
double | m_latitude_of_origin |
Latitude chosen as origin of y-coordinates (EPSG 8801). More... | |
double | m_longitude_of_origin |
Longitude chosen as origin of x-coordinates (central meridian) (EPSG 8802). More... | |
double | m_false_easting |
Value added to x-coordinates (EPSG 8806). More... | |
double | m_false_northing |
Value added to y-coordinates (EPSG 8807). 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 Guam Projection projection (EPSG 9831).
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inline |
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overridevirtual |
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 non-all-zero 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.
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inlineoverridevirtual |
Clone the object.
Implements gis::srs::Spatial_reference_system.
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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.
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overridevirtual |
Retrieve the proj4 parameter string.
If the SRS can't be represented as a proj4 parameter string, an empty string is returned.
Reimplemented from gis::srs::Spatial_reference_system.
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inlineoverridevirtual |
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private |
Value added to x-coordinates (EPSG 8806).
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private |
Value added to y-coordinates (EPSG 8807).
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private |
Latitude chosen as origin of y-coordinates (EPSG 8801).
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private |
Longitude chosen as origin of x-coordinates (central meridian) (EPSG 8802).