Rock Template

 

Delineation

The limit of ROCK that is abovewater is the edge of the mass exposed at mean lower low

water.

 

The limit of ROCK that is underwater is as shown on the final compilation provided to

USGS by NOS.

 

Date Extraction

Capture Conditions

 

If ROCK is exposed at mean lower low water and is < 0.03" in the longest axis, and

is on an existing NOS chart,

Or

For a topographic/bathymetric edition only, if ROCK is on the final compilation provided to USGS by NOS, then capture.

 

Source Interpretation Guidelines

 

All

 

Do not capture exposed rocks < 0.03" as ROCK.   See rules for islands within LAKE/POND, SEA/OCEAN, and STREAM/RIVER.

 

Groups of rocks are sometimes surrounded by limiting danger lines, as

delineated by NOS. Capture individual rocks as ROCK. Capture the extent

of the limiting danger line as HAZARD ZONE.

 

Numerous closely spaced ROCKS that form a chain along the coastline or

close to the shore are collected as REEF. (Quantified rules are TBD)

 

Graphic

 

Capture all ROCKS, except submerged rocks shown on topographic maps.

ROCKS on pre-1961 maps that are not consistent with current capture

conditions are not captured.

 

Revision - General

 

Revision - Standard

 

Revision - Limited

 

Do not revise. Retain existing features.

 

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