Sounding Datum Line Template
Positional Accuracy - The accuracy within which a feature can be confidently positioned
Approximate - conditions permit the feature to be confidently positioned between 0.02" and 0.1", at
map scale, of its true ground position.
Definite - Conditions permit the feature to be confidently positioned. Horizontal data are confidently
positioned within 0.02", at map scale, of the true ground position. Vertical data are
confidently positioned within one-half contour interval of the true ground position.
The limit of SOUNDING DATUM LINE is the line of mean lower low water.
For a topographic/bathymetric edition only, if SOUNDING DATUM LINE is on the
final compilation provided to USGS by NOS, then capture.
Source Interpretation Guidelines
If SOUNDING DATUM LINE is not symbolized on the source (as when the
position of the line is indicated by the edge of the FORESHORE tint on
graphic source, rather than by a unique line symbol), Then Positional
Accuracy = Approximate.
Revision – General
Revision – Standard
Revision – Limited
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