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This datalayer represents Offshore city and town boundaries for Massachusetts. The data are derived from 1:80,000 NOAA Charts and 1:24,000 USGS quadrangle maps of various dates. The coastline is the same as in the TOWNS_POLY and OUTLINE _POLY layers (1:100,000 USGS).
In ArcSDE are two layers - OFFSH80K_POLY and OFFSH80K_ARC.
The OFFSH80K_POLY attribute table contains the following items:
0 and 1 TOWN_ID
Unique municipal identifier (from 1-351 Town ID List)
The OFFSH80K_ARC attribute table contains the following items:
Source of arc and person digitizing. Arc source is either NOAA 1:80,000 charts or USGS 1:24,000 topographic quadrangle maps. TYPE
Numeric code for source
Codes are as follows:
V. ANTIL, DFWELE, NOAA CHARTS 2
V. ANTIL, DFWELE, USGS 1:24,000 TOPO MAPS 3
D. WEAVER, MassGIS, 1:24,000 USGS TOPO MAPS 4
N. MACGAFFEY, CZM, USGS 1:24,000 TOPO MAPS 5
MassGIS is maintaining the datalayer. No updates are planned. For more spatially-accurate coastline data see the Towns from Survey Points layer.
Last Updated 9/30/2008