255 Cartographic Mathematical Data (R) (Variable Data Fields)

Codes

First and Second indicators:

# Undefined

Subfields:

a Statement of scale (NR)

b Statement of projection (NR)

c Statement of coordinates (NR)

d Statement of zone (NR)

e Statement of equinox (NR)

f Outer G-ring coordinate pairs (NR)

g Exclusion G-ring coordinate pairs (NR)

6 Linkage (NR)

8 Field link and sequence number (R)

NOTE: See *MARC 21 Format for Bibliographic Data*
(255 Cartographic Mathematical Data) for
code definitions not given below.

Description/Instructions

Field 255 contains mathematical data associated with cartographic material, including a statement of scale, statement of projection, and/or a statement of bounding coordinates. The coordinates can represent a bounding rectangle, the outline of the area covered, and/or the outline of an interior area not covered. For celestial charts, it may also contain a statement of zone, declination area, and/or right ascension data, and/or equinox. The mathematical data in this field is also recorded in coded form in field 034 (Coded Cartographic Mathematical Data).

The data in
this field are customarily entered as specified by various cataloging
rules. In records formulated following cataloging rules based
on International Standard Bibliographic Description (ISBD) principles,
a relationship exists between prescribed ISBD punctuation and the identification
of specific subfield data. *AACR2*
formulated bibliographic records follow ISBD principles for description
and punctuation. Most of the examples in this section illustrate
the prescribed ISBD punctuation associated with specific subfields.

Editing instructions

Input a period at the end of the field.

Subfields

Subfield $a contains the entire scale statement including any equivalency statements. Vertical scales or vertical exaggeration statements for relief models or other three-dimensional items are also included in subfield $a.

In records formulated according to ISBD principles, subfield $a includes all data up to and including the semicolon (;) when subfield $a is followed by subfield $b.

255 ## Scale not given.

255 ## Scale [ca. 1:90,000].

255 ## Scale [1:6,336,000]. 1" = 100 miles. Vertical scale [1:192,000]. 1/16" = approx. 1000'.

255 ## Scale not given ; $b Conic proj.

Subfield $b contains the entire projection statement, if applicable. In records formulated according to ISBD principles, subfield $b includes all data following the semicolon (;) and up to but not including the opening parenthesis (() that introduces subfields $c, $d, and/or $e.

255 ## Scale [ca. 1:500,000] ; $b Base fitted to Lambert conformal conic proj. based on standard parallels of 33° and 45°.

255 ## Scale [1:13,835,000]. 1 cm. = 138 km. 1 in. = 218 miles ; $b Chamberlin trimetric proj.

255 ## Scale 1:22,000,000 ; $b Conic proj. $c (E 72°--E 148°/N 13°--N 18°).

Subfield $c contains the statement of coordinates. The coordinates are recorded in the order of westernmost longitude, easternmost longitude, northernmost latitude, and southernmost latitude.

In records formulated according to ISBD principles, subfield $c data are enclosed in parentheses. The two longitude statements and the two latitude statements are each separated by a two hyphens (--). The longitude is separated from the latitude by a slash (/).

255 ## Scale 1:7,500,000 $c (W 125°--W 65°/N 49°--N 25°).

255 ## Scale 1:250,000 $c (E 32°30'--E 34°30'/N 35°30'--N 35°00').

255 ## Scale [ca. 1:10,000] ; $b Gauss proj. $c (W 9°13'52"--W 9°04'47"/N 38°48'35"--N 38°41'29").

Subfield $d contains the statement of zone for celestial charts.

In records formulated according to ISBD principles, subfield $d data, along with any subfield $e data, are enclosed in parentheses.

255 ## Scales vary $d (Zones +90° to +81° to 63°, -81° to 98° ; $e eq. 1950).

255 ## Scale 88 mm per 1° $d (RA 16 hr./Decl. +30° ; $e eq. 1973.50).

Subfield $e contains the statement of equinox or epoch. In records formulated according to ISBD principles, subfield $e data, along with any subfield $c or $d data, are enclosed in parentheses.

255 ## Scale not given $d (RA 0 hr. to 24 hr./Decl. +90° to -90° ; $e eq. 1980).

255 ## Scales vary $e (Eq. 1986.00).

$f Outer G-ring coordinate pairs.

Subfield $f contains coordinate pairs that identify the closed non-intersecting boundary of the area covered.

$g Exclusion G-ring coordinate pairs.

Subfield $g contains coordinate pairs that identify the closed non-intersecting boundary of the area contained within the G-polygon outer ring that is excluded.

For instructions on the use of subfield $6, see field 880.

Related fields, etc.

255 Cartographic Mathematical Data
*(MARC 21 Format for Bibliographic
Data)*

See also:

250-28X Edition, Imprint, Etc. Fields

Section E. MARC 21 Format for Serials as Applied Within CONSER