org.apache.sis.referencing.operation.projection

## Enum NormalizedProjection.ParameterRole

• ### Enum Constant Detail

• #### SEMI_MAJOR

public static final NormalizedProjection.ParameterRole SEMI_MAJOR
Maps the semi-major axis length parameter (symbol: a). This value is used for computing Normalized­Projection​.eccentricity, and is also a multiplication factor for the denormalization matrix.

Unless specified otherwise, this is always mapped to a parameter named "semi_major". Normalized­Projection subclasses typically do not need to provide a value for this key.

• #### SEMI_MINOR

public static final NormalizedProjection.ParameterRole SEMI_MINOR
Maps the semi-minor axis length parameter (symbol: b). This value is used for computing Normalized­Projection​.eccentricity.

Unless specified otherwise, this is always mapped to a parameter named "semi_minor". Normalized­Projection subclasses typically do not need to provide a value for this key.

Maps the parameter for the latitude where to compute the radius of conformal sphere (symbol: Rc). If this parameter is provided, then the radius of the conformal sphere at latitude φ will be used instead than the semi-major axis length in the denormalisation matrix. In other words, if provided then a is replaced by Rc below:
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This enumeration shall be used only when the user requested explicitely spherical formulas, for example the "Mercator (Spherical)" projection (EPSG:1026), but the figure of the Earth may be an ellipsoid rather than a sphere. In the majority of cases, this enumeration should not be used.

• #### CENTRAL_MERIDIAN

public static final NormalizedProjection.ParameterRole CENTRAL_MERIDIAN
Maps the central meridian parameter (symbol: λ₀). This value is subtracted from the longitude values before the map projections.

Some common names for this parameter are:

• Longitude of origin
• Longitude of false origin
• Longitude of natural origin
• Spherical longitude of origin
• Longitude of projection centre
• #### SCALE_FACTOR

public static final NormalizedProjection.ParameterRole SCALE_FACTOR
Maps the scale factor parameter (symbol: k₀). This is a multiplication factor for the (x,y) values obtained after map projections.

Some common names for this parameter are:

• Scale factor at natural origin
• Scale factor on initial line
• Scale factor on pseudo standard parallel
• #### FALSE_EASTING

public static final NormalizedProjection.ParameterRole FALSE_EASTING
Maps the false easting parameter (symbol: FE). This is a translation term for the x values obtained after map projections.

Some common names for this parameter are:

• False easting
• Easting at false origin
• Easting at projection centre
• #### FALSE_WESTING

public static final NormalizedProjection.ParameterRole FALSE_WESTING
Maps the false westing parameter (symbol: FW). This is the same x translation than FALSE_EASTING, but of opposite sign.

Actually, there is usually no parameter named "false westing" in a map projection. But some projections like "Lambert Conic Conformal (West Orientated)" are defined in such a way that their "false easting" parameter is effectively a "false westing". This enumeration value can be used for informing Normalized­Projection about that fact.

• #### FALSE_NORTHING

public static final NormalizedProjection.ParameterRole FALSE_NORTHING
Maps the false northing parameter (symbol: FN). This is a translation term for the y values obtained after map projections.

Some common names for this parameter are:

• False northing
• Northing at false origin
• Northing at projection centre
• #### FALSE_SOUTHING

public static final NormalizedProjection.ParameterRole FALSE_SOUTHING
Maps the false southing parameter (symbol: FS). This is the same y translation than FALSE_NORTHING, but of opposite sign.

Actually, there is usually no parameter named "false southing" in a map projection. But some projections like "Transverse Mercator (South Orientated)" are defined in such a way that their "false northing" parameter is effectively a "false southing". This enumeration value can be used for informing Normalized­Projection about that fact.

• ### Method Detail

• #### values

public static NormalizedProjection.ParameterRole[] values()
Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
for (NormalizedProjection.ParameterRole c : NormalizedProjection.ParameterRole.values())
System.out.println(c);

Returns:
an array containing the constants of this enum type, in the order they are declared
• #### valueOf

public static NormalizedProjection.ParameterRole valueOf(String name)
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
Parameters:
name - the name of the enum constant to be returned.
Returns:
the enum constant with the specified name
Throws:
Illegal­Argument­Exception - if this enum type has no constant with the specified name
Null­Pointer­Exception - if the argument is null