255  Cartographic Mathematical Data (R)
MARC 21 Bibliographic  Full
February 1999
First Indicator Undefined #  Undefined

Second Indicator Undefined #  Undefined



Subfield Codes

$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 Gring coordinate pairs (NR) $g  Exclusion Gring coordinate pairs (NR) $6  Linkage (NR) $8  Field link and sequence number (R)

FIELD DEFINITION AND SCOPE
Mathematical data associated with cartographic material, including celestial charts. This
data may also be coded in field 034 (Coded Mathematical Data).
Date recorded includes 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 data, and/or right
ascension data, and/or equinox.
GUIDELINES FOR APPLYING CONTENT DESIGNATORS
■ INDICATORS
 Both indicator positions are undefined; each contains a blank (#).
■ SUBFIELD CODES
$a  Statement of scale Entire scale statement including any equivalency statements, vertical scales or
vertical exaggeration statements for relief models and other threedimensional
items.
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 
##$aScale not given.

255 
##$aScale [ca. 1:90,000].

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

255 
##$aScale not given ;$bConic proj.

$b  Statement of projection Entire projection statement. 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 
##$aScale [ca. 1:500,000] ;$bBase fitted to Lambert conformal conic proj. based on
standard parallels of 33° and 45°.

255 
##$aScale [ca. 1:13,835,000]. 1 cm. = 138 km. 1 in. = 218
miles ;$bChamberlin trimetric proj.

255 
##$aScale 1:22,000,000 ;$bConic proj.$c(E 72°E 148°/N 13°N 18°).

$c  Statement of coordinates 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 two hyphens (). The longitude is separated from
the latitude by a slash (/).










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

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

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

$d  Statement of zone Used for celestial charts.
In records formulated according to ISBD principles, subfield $d data,
along with any subfield $e data, are enclosed in parentheses.










255 
##$aScales vary$d(Zones +90° to +81° to 63°, 81° to 98° ;$eeq. 1950).

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

$e  Statement of equinox 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 
##$aScale not given$d(RA 0 hr. to 24 hr./Decl. +90° to 90° ;$eeq. 1980).

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

$f  Outer Gring coordinate pairs Coordinate pairs that identify the closed nonintersecting boundary of the area
covered.
$g  Exclusion Gring coordinate pairs Coordinate pairs that identify the closed nonintersecting boundary of the area
contained within the Gpolygon outer ring that is excluded.
$8  Field link and sequence number
INPUT CONVENTIONS
Punctuation  Field 255 ends with a period. See also subfield descriptions for punctuation
information.