342 Geospatial Reference Data

Field definition and scope:

Field 342 contains a description of the frame of reference for the coordinates in a data set. To work with a data set a user must be able to identify how location accuracy has been affected through the application of a geospatial reference method, thus enabling the user to manipulate the data set to recover location accuracy.

The National level record requirement for this field is Mandatory if applicable.

Field 342 is repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National-level (NLR) and Minimal-level (MLR) record requirements, and designator repeatability, see table below:

Position	Description	NLR	MLR	Repeatability
Field 342	Geospatial Reference Data	A	O	R
Indicator:
First	Geospatial reference dimension	M
0	Horizontal coordinate system	A
1	Vertical coordinate system	A

Second	Geospatial reference method	M
0	Geographic	A
1	Map projection	A
2	Grid coordinate system	A
3	Local planar	A
4	Local	A
5	Geodetic model	A
6	Altitude	A
7	Method specified in $2	A
8	Depth	A

Subfield code:
$a	Name	A	O	NR
$b	Coordinate or distance units	A	O	NR
$c	Latitude resolution	A	O	NR
$d	Longitude resolution	A	O	NR
$e	Standard parallel or oblique line latitude	A	O	R
$f	Oblique line longitude	A	O	R
$g	Longitude of central meridian or projection center	A	O	NR
$h	Latitude of projection origin or projection center	A	O	NR
$i	False easting	A	O	NR
$j	False northing	A	O	NR
$k	Scale factor	A	O	NR
$l	Height of perspective point above surface	A	O	NR
$m	Azimuthal angle	A	O	NR
$n	Azimuth measure point longitude or straight vertical longitude from pole	A	O	NR
$o	Landsat number and path number	A	O	NR
$p	Zone identifier	A	O	NR
$q	Ellipsoid name	A	O	NR
$r	Semi-major axis	A	O	NR
$s	Denominator of flattening ratio	A	O	NR
$t	Vertical resolution	A	O	NR
$u	Vertical encoding method	A	O	NR
$v	Local planar, local, or other projection or grid description	A	O	NR
$w	Local planar or local georeference information	A	O	NR
$2	Reference method used	A	O	NR
$6	Linkage	A	O	NR
$8	Field link and sequence number	O	O	R

Input conventions:

Data constant

Map projections

Punctuation