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5.1 Spatial Address and Foreign Identifier Fields

Spatial address and foreign identifiers fields are common to a number of modules and are therefore defined only once in this section. They are referenced only by field name in the module specification tables and are not further described in the domain description columns of the tables. The field name used in the module specification table may be different from the field names shown in this section, but the field prefix (-) will indicate that a field is a spatial address field, and the field prefix (^) indicates that a field is a foreign identifier field (see 4.2.3.9, Notation Summary).

5.1.1 Spatial Address

Spatial address fields occur in many modules and are fully defined in Table 8 -, Spatial address field specification.

Note that the field name "spatial address" has all lowercase characters, meaning that the field name is generic. Different names may therefore appear in the module description tables (see 4.2.3.2, Generic Specification.)

The fourth subfield nongeospatial component is prefixed with a "+" which indicates a generic specification which must be completed by the data encoder. Zero or more subfields can be defined here to append nongeospatial dimensions to a spatial address. Examples are time, parts per billion, pressure, or any other measurement excluding the x,y, and z spatial dimensions.

The nongeospatial component subfield is not applicable when the spatial address field is substituted for the following fields:

• RGIS/EADS
• RGIS/IADS
• SPDM/DMSA
• PNTS/OSAD
• PNTS/SSAD
• ARC/ARAD
• ARC/ELAD
• ARC/CADR

The Spatial Address field specification must be used consistent with the configuration of the applicable Internal Spatial Reference System module. If subfield Spatial Address Type is set to 3-tuple, then subfield Z must be present; otherwise absent. For every repetition of the subfield Dimension Id, there must be a user-defined subfield specification substituted for nongeospatial components subfield. The order of the DMID field repetition must match the order of the user-defined subfield specifications of the Spatial Address field. Once the Spatial Address field specification has been completed, it is the same for all modules to which the Internal Spatial Reference module instance applies.

5.1.2 Foreign Identifier

Foreign identifiers are also part of a number of module specifications and are specified in Table 9 -, Foreign identifier field specification.

The third subfield is only appropriate to modify references to lines or rings. Hence, it is only appropriate when the Object Representation subfield of the referenced module record contains Lx or Rx.

Table 8 - Spatial address field specification

FIELD nAME	SUBFIELD NAME	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
(-)spatial address		The order of the instances of this field is dictated by the particular module in which the field is used.				SADR
	X [M]	X Component of the spatial address.	I|R|S|B	Numeric	For INTERNAL, defined in the Horizontal Component Format subfield of the Internal Spatial Reference module and according to the specifications of 4.1.3.5.1.	X
	Y [M]	Y Component of the spatial address.	I|R|S|B	Numeric	For INTERNAL, defined in the Horizontal Component Format subfield of the Internal Spatial Reference module and according to the specifications of 4.1.3.5.1.	Y
	Z [O]	Z Component of the spatial address.	I|R|S|B	Numeric	For INTERNAL, defined in the Vertical Component Format subfield of the Internal Spatial Reference module and according to the specifications of 4.1.3.5.1.	Z
	(+) nongeospatial component	The format and subfield mnemonic are derived by the Dimension Definition records defining the internal coordinate system of the spatial address. There will be one repetition of the subfield for each additional non-geospatial dimension, the order of repetition will be controlled by the order Dimension ID fields repeat in the Internal Reference record.	I|R|S|C|B	Alphanum Integer Real Binary	As indicated by the Dimension Component Format subfield in the corresponding Dimension Definition record.	(Derived from the Dimension Label subfield of the Dimension Definition Record)

Table 9 - Foreign identifier field specification

Field name	Subfield name	FIELD/SUBFIELD DESCRIPTION	TYPE	DOMAIN	DOMAIN DESCRIPTION	MNEMONIC
(^)foreign id						FRID
	Module Name [M]	Module name(s) of module(s) referenced.	A	Gr-chars	Module name of module referred. Wildcard characters may be used for reference to multiple module names. Use of wildcards in this subfield is restricted to global modules.	MODN
	Record ID [M]	Identifier of record(s) referenced.	I	Integer	The absolute value of this integer represents the Record ID of the record referred to. A negative value is used to reference all records in a module, as specified in 4.1.3.4.5 (b).	RCID
	Usage Modifier	Used to modify references to lines or rings. Must only be used when pointing to Line Module records from composites, nodes, rings, or polygons, or to Ring Module records from polygons.	A	S E L R F B I X	Start node of line End node of line Left polygon of a line Right polygon of a line Forward orientation of a line or ring Backward orientation of a line or ring Interior polygon of a ring Exterior polygon of a ring	USAG