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COAST COVERAGE INFORMATION
Coverage Type vector Topology net Sources US Geological Survey Office of Geographic Information COAST contains statewide coastal features in Maine. Some New Hampshire and New Brunswick coastlines are also included. Data for this coverage were digitized from the Mean High Water (MHW) line as shown on USGS 1:24,000 scale quadrangle maps. In addition, tidal rivers and ponds are also included in this coverage. The extent of tidal features was determined by a group of marine specialists familiar with Maine's coast. For rivers where the tidal extent was unclear the first contour or bridge crossing the river was used. Features which may be tidal but were connected to the coast by single line streams are not included in the coverage at this time. Codes for marine, tidal, and island polygons have been added. In addition, students at the College of the Atlantic attached Maine State Planning Office Coastal Island Registry Numbers (CIREG) to island polygons. Arcs contain codes describing coastline type, such as MHW, contour, or river mouth closure line. Coding for this coverage will be updated in the near future. All 121 coastal quads are available at this time. However, a few have slightly less than acceptable linework and are being redigitized. This work should be completed by Summer, 1995. Approximate size of exported file 360 kB per 1:24,000 scale quad COAST CODING SHEET ARC Coding Codes Description CHECK Item used in QA/QC. CLOSURE Closure line types. Items marked by * are not completely coded at this time. 1 Fresh / estuarine* 12 12 mile limit* 2 Estuarine / marine* 3 3 mile limit 4 River mouth COAST Coastline type. 1 Mean High Water (USGS) 2 Causeway 3 Contour 4 Dam 5 Bridge 6 Other ISLAND Identifies island shorelines. 0 Non-island arc 1 Island arc LOCAL State or province location of line. 1 Maine 2 New Hampshire 3 New Brunswick TYPE Identifies line type. 0 Closure lines 1 Mainland arcs 2 Island arcs POLYGON Coding Codes Description CIREG Coastal Island Registry Number. A value of NO CIR indicates no number has been assigned at this time. CLASS Same as source. LOCAL State or province location of polygon. 1 Maine 2 New Hampshire 3 New Brunswick RIVER Identifies tidal rivers. 0 Non-river polygon 1 River polygon SOURCE Source for feature digitized - mainly identifies islands not shown on USGS 1:24,000 scale quads. B OGIS digital files N Islands not shown on USGS quads P Paper map SUFF Letter suffix added to cireg by COA. TYPE Identifies island and other type polygons. Items marked by * are not completely coded at this time. 0 Island poly 1 Marine poly 2 Estuarine poly 3 Tidal fresh polygon* |
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