OVERVIEW

The nautical datalayer was developed by Photo Science Inc. of Gaithersburg, Maryland for the Massachusetts Coastal Zone Management (MCZM) Program.  The datalayer contains 25 feature layers from NOAA nautical charts. Only features represented by line work were extracted. Aids to navigation and bathymetry were not compiled. In ArcSDE the layer is named NAUTICAL_ARC. An annotation feature class is named NAUTICAL_ANNO_DESC.

Thirty three individual NOAA digital nautical charts ranging in scale from 1:5,000 to 1:80,000.

TIFF imagery was imported to ESRI's Arc/Info with the IMAGEGRID command.  Magenta, Gray, and Black features were extracted with ARCSCAN.  Custom editing was conducted to capture or remove features after the ARCSCAN session.  Vector editing was conducted using imagery in the background.  Topology was generated for each chart with the BUILD LINE option.  All charts were APPENDED to a single state-wide coverage.  No "rubber sheeting" of data along chart boarders was conducted.  Features were split on boarders of different scale charts, and lower resolution data was removed.

The layer's arc attribute table has the CODE (0-24) and DESCRIPTIO items, as follows:
 

0    Unidentified 1    Channel Boundary 2    Traffic Lane 3    COLREGS Demarcation Zone 4    Cable 5    Pipeline 6    Sewer Line 7    Three Nautical Mile 8    Territorial Sea 9    Anchorage Area 10   Pilot Boarding Area 11   Pipeline Area 12   Precautionary Area

13   Prohibited Area 14   Cable Area 15   Channel Separation Zone 16   Disposal 17   Unexploded Ordinance Area 18   Fish Trap Area 19   Safety Zone 20   Spoil Area 21   Area to be Avoided 22   Anchorage berths 23   Tunnel 24   National Wildlife Refuge Area

Currently there are no plans to update this data by MCZM.

Last Updated 1/14/2008
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