Types of Coordinate Systems

The following types of 2-D coordinate systems exist in the UC, and the user can specify one with the number of function. (Functions that return the function number from an abbreviation or name is also available.) Each coordinate system needs different sets of parameters for normalization transformation depending on the type.

Rectangular Linear Coordinates

Number	Abbrev.	Name
1	U-U	UNI-UNI	rectangular uniform coordinate
2	U-L	UNI-LOG	semi- logarithmic coordinate
3	L-U	LOG-UNI	semi-logarithmic coordinate
4	L-L	LOG-LOG	logarithmic coordinate

Rectangular Curvilinear Coordinates

Number	Abbrev.	Name
5	POL	POLAR	polar coordinate
6	BPL	BIPOLAR	bipolar coordinate
7	ELP	ELLIPTIC	elliptic coordinate (not yet implemented)

Map Projection Coordinates

Number	Abbrev.	Name
10	CYL	CYLINDRICAL	equidistant cylindrical projection
11	MER	MERCATOR	Mercator's projection
12	MWD	MOLLWEIDE	Mollweide's projection
13	HMR	HAMMER	Hammer's projection
14	EK6	ECKERT 6	Eckert VI projection
15	KTD	KITADA	Kitada's elliptic projection
20	CON	CONICAL	equidistant conical projection
21	COA	CONICAL EQ.AREA	Lambert's equal-area conical projection
22	COC	CONICAL CONFORMAL	Lambert's conformal conical projection
23	BON	BONNE	Bonne's projection
30	OTG	ORTHOGRAPHIC	orthographic projection
31	PST	POLAR STEREO	polar stereo projection
32	AZM	AZIMUTHAL	azimuthal equidistant projection
33	AZA	AZIMUTHAL EQ.AREA	Lambert's azimuthal equal-area projection

User Defined Coordinates

Number	Abbrev.	Name
99	USR	USER	User defined function

The user will prepare the transformation function necessary for the user defined coordinate system. For details, see Section 6 (STPACK).

1.4.1 Types of Coordinate Systems