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Extending HCL OneDB™Beyond standard relational database objects, HCL OneDB™ can be extended to handle specialized data types, access methods, routines, and other objects. HCL OneDB™ includes many built-in extensions that are fully integrated in the database server. HCL OneDB™ also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for HCL OneDB™.
HCL OneDB™ extensions and DataBlade® modulesThese topics describe how to use built-in database extensions and separately installed DataBlade® modules.
Spatial Data User's GuideThe HCL OneDB™ Spatial Data User's Guide contains information to assist you in using the HCL® OneDB® spatial extension. The HCL® OneDB® spatial extension adds custom data types and supporting routines to the server.
Appendixes
OGC well-known text representation of spatial reference systemsThese topics explain how to represent a spatial reference system using a text string and provides information about supported units of measure, spheroids, datums, prime meridians, and projections.
Angular unitsHCL® OneDB® spatial data types support many angular units.

Angular units

HCL® OneDB® spatial data types support many angular units.

The following table shows a representative sample of the angular units of measure supported by the HCL OneDB spatial data types. For a complete list of supported angular units of measure, see the file INFORMIXDIR/extend/spatial.version/include/pedef.h.

Table 1. Angular units
Factory ID	Description	OGC well-known text string
9101	Radian	UNIT["Radian",1]
9102	Degree	UNIT["Degree",0.0174532925199433]
9103	Arc-minute	UNIT["Minute",0.0002908882086657216]
9104	Arc-second	UNIT["Second",4.84813681109536E-06]
9105	Grad (angle subtended by 1/400 circle)	UNIT["Grad",0.01570796326794897]
9106	Gon (angle subtended by 1/400 circle)	UNIT["Gon",0.01570796326794897]
9109	Microradian (1e-6 radian)	UNIT["Microradian",1E-06]
9112	Centesimal minute (1/100th Gon (Grad))	UNIT["Minute_Centesimal",0.0001570796326794897]
9113	Centesimal second(1/10000th Gon (Grad))	UNIT["Second_Centesimal",1.570796326794897E-06]
9114	Mil (angle subtended by 1/6400 circle)	UNIT["Mil_6400",0.0009817477042468104]