Code 123 - Coded Data Field:
Cartographic materials -
scale and coordinates (Mandatory) (R)
Indicator 1: Type of Scale Code Indicator
0 Scale indeterminable
1 Single scale
2 Multiple scales
3 Range of scales
4 Approximate scale
Indicator 2: blank
Subfield codes
$a Type of Scale (Mandatory, Not repeatable)
a = linear scale
b = angular scale
z = other type of scale (e.g., time scale, quantitative
statistical scale)
$b Constant Ratio Linear Horizontal Scale (Repeatable)
$c Constant Ratio Linear Vertical Scale (Repeatable)
$d Co-ordinates Westernmost Longitude (Not repeatable)
$e Co-ordinates Easternmost Longitude (Not repeatable)
$f Co-ordinates Northernmost Latitude (Not repeatable)
$g Co-ordinates Southernmost Latitude (Not repeatable)
Each subfield is fixed at 8 characters:
Character position 0
Hemisphere
w = west
e = east
n = north
s = south
Character positions 1 to 3
Degree: 3 numeric characters, right justified, filled with zeros
Character positions 4 to 5
Minute: 2 numeric characters, right justified, filled with zeros
Character positions 6 to 7
Second: 2 numeric characters, right justified, filled with zeros
$h Angular Scale (Repeatable)
A 4 character number right justified and filled with zeros, giving the
scale in terms of millimetres to a degree
$i Declination Northern Limit (Not repeatable)
$j Declination Southern Limit (Not repeatable)
$k Right ascension Eastern Limits (Not repeatable)
$m Right ascension Western Limits (Not repeatable)
Character positions 0 to 1
Hour: 2 numeric characters, right justified, filled with zeros
Character positions 2 to 3
Minute: 2 numeric characters, right justified, filled with zeros
Character positions 4 to 5
Second: 2 numeric characters right justified, filled with zeros
$n Equinox (Not repeatable)
$o Epoch (Not repeatable)