Shellfish polygons were digitized from hand drawn polygons representing hardclam, softclam, and oyster beds produced by the Department of Agriculture from their records in 1990 (approximately). The data is general in its nature and should be used only as a guide.
The Shellfish layer is 1:24,000-scale data. It depicts the approximate location of shellfish beds along the Connecticut coast and is suitable as a general means of identifying a resource area. This layer should not be construed to depict the actual, absolute locations of any shellfishing resources. Use this layer with other 1:24,000-scale map data such as the Coastal Boundary, Town Boundaries, Roads and Trails, Airports, Railroads and other base map data derived from the USGS 7.5 minute topographic quadrangle maps and compiled at a 1:24000 scale.
ground condition
There are no legal prerequisites for using the data, however this layer should not be construed to depict the actual, absolute locations of any shellfishing resources. Note, the data is not intended for maps printed at map scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet.) Once acquired, any modification made to the data must be noted in the metadata. When printing this information on a map or using it in a software application, analysis, or report, please acknowledge the State of Connecticut, Department of Environmental Protection as the source for this information.
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The layer retains the feature types and information identified by the State of Connecticut, Department of Environmental Protection and obtained from the Department of Agriculture hardclam, softclam, and oyster maps. All attributes have valid values. Values are within defined domains.
Establishment of logical consistency was performed by the State of Connecticut, Department of Environmental Protection using ESRI ArcGIS software to manually create and control feature topology in SHAPEFILE format. No automated procedures or tests were performed to guarantee desired topology other than visual inspection.
The completeness of the data reflects the feature content of the data sources, which include the Department of Agriculture source maps.. The layer is complete in the sense that it accurately reflects the contents of the source information available at the time the State of Connecticut, Department of Environmental Protection created the layer. However, compared to current conditions, the layer may be incomplete. This data is not updated.
The horizontal positional accuracy of this data is unknown. The polygon features represent approximate positions for arge area objects or observations.
Hard clam, soft clam, and oyster bed polygons were digitized from hand drawn polygons produced by the Department of Agriculture from their records in 1990 (approximately).
The individual hardclam, softclam, and oyster GIS shapefiles were aggregated into one shellfish layer. Attributes were modified to describe whether an area was comprised of one or several types of shellfish classes.
Calculated area of polygon feature in acres. Note, ACREAGE values are not automatically updated after modifying feature geometry (shape). Values must be recalculated after features are edited, simplified, generalized, clipped, dissolved, etc.
State of Connecticut, Department of Environmental Protection
Feature geometry.
ESRI
Text field indicating the presence of one or more types of shellfish data resulting from the aggregation of hardclam, softclam, and oyster data.
State of Connecticut, Department of Environmental Protection
True/False indicator on whether the oyster layer indluded values for the gien area.
State of Connecticut, Department of Environmental Protection
True/False indicator on whether the hardclam layer included values for the given area.
State of Connecticut, Department of Environmental Protection
Internal feature number.
ESRI
Feature geometry.
ESRI
True/False indicator on whether the sofclam layer included values for the given area.
State of Connecticut, Department of Environmental Protection
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Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.
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