Code 131 - Coded Data Field: Cartographic materials - geodetic, grid and vertical measurement (NR)
Indicators: blank
Subfield codes $a Spheroid (Repeatable) $b Horizontal Datum (Repeatable) $c Grid and Referencing System (Repeatable) $d Overlapping and Referencing System (Repeatable)
A two character code indicating a subsidiary grid or referencing system which extends across the face of the cartographic material.
$e Secondary Grid and Referencing System (Repeatable)
A two character code indicating a subsidiary grid or referencing system which appears in the form of marginal ticks.
$f Vertical Datum (Repeatable)
A two character code used to indicate the vertical datum(s) named on the cartographic material
$g Unit of Measurement of Heighting (Repeatable)
A two character code indicating the unit of measurement of heighting
$h Contour Interval (Repeatable)
Up to four characters indicating the value of interval of the main contours (i.e. those contours which always appear when applicable) in the unit of measurement given in subfield $g. Up to one decimal place may be recorded values of more than one decimal place should be rounded up to one. Repeatable for each value when, for example, the value changes with height.
$i Supplementary Contour Interval (Repeatable)
Up to four characters indicating the value of the interval of supplementary contours, i.e. contours used between main contours to increase the topograph topographic expression of the area (e.g. in areas of low relief) or contours whose value is not repeated on the surface of the map. The unit of measurement is that given in ubfield $g. Up to one decimal place may be recorded, values of more than one decimal place should be rounded up to one.
$j Unit of Measurement of Bathymetry (Repeatable) $k Bathymetric Interval (Repeatable) $l Supplementary Bathymetric Interval (Repeatable)
The oceanographic equivalent of subfields $g to $i. The rules for these subfields apply to subfields