Channels, Basins, and Anchorages is a 1:20,000-scale, polygon feature-based layer that includes the location of channels, turning basins, and anchorages within (mostly) Connecticut waters. The layer is derived from information depicted on the 2002 edition of digital National Oceanic & Atmospheric Administration (NOAA) nautical charts, Maptech, Inc. and US Army Corps of Engineers (USACOE) Volume 3 - Rivers & Harbors of Rhode Island and Connecticut Project Maps publication dated Sept 1988. The Channels, Basins, and Anchorages layer was compiled during the summer of 2001. The layer represents conditions at a particular point in time. The layer includes representations of areas of channels, turning basins, and anchorages that are or may be periodically maintained by various entitites for commercial and recreational uses. It does not include all possible/potential such areas, just those identified on the source documents; nor does the layer include any buoys or channel markers designating the bounds or entrances to channels, basins, or anchorages. Features are polygon locations that represent the approximate or assumed location of channels, turning basins, and anchorages. Attribute information is comprised of codes to uniquely identify individual features, encode feature information, and cartographically represent (symbolize) channels, turning basins, and anchorages features on a map. Data is compiled at 1:20,000 scale. This data is not updated.
Channels, Basins, and Anchorages is 1:20,000-scale data. It depicts the location of federal and non-federal channels, basins, and anchorages areas. Use this layer to display the locations of underwater boating/shipping areas in and around Long Island Sound and the waterways of Connecticut. Use this layer with 1:20,000-scale map data such as the 2002 digital National Oceanic & Atmospheric Administration (NOAA) Nautical Charts or with any other 1:24,000 scale DEP natural resource data. Not intended for maps printed at map scales greater or more detailed than 1:20,000 scale (1 inch = 1,666.66 feet.)
For additional information, refer to the websites of the National Oceanic & Atmospheric Administration (NOAA) at http://www.noaa.gov, or Maptech, Inc. at http://www.maptech.com.
publication date
No restrictions or legal prerequisites for using the data. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:20,000 scale (1 inch = 1,666.66 feet.) Although this data set has been used by the State of Connecticut, Department of Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Environmental Protection as to the accuracy of the data and or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata. When printing this data 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 Channels, Basins, and Anchorages layer retains the feature types and information identified by the State of Connecticut, Department of Environmental Protection and obtained from the 2002 edition of the digital National Oceanic & Atmospheric Administration (NOAA) Nautical Charts provided by Maptech, Inc., and US Army Corps of Engineers (USACOE) Volume 3 - Rivers & Harbors of Rhode Island and Connecticut Project Maps publication dated Sept 1988. All attributes have valid values. Values are within defined domains. The accuracy test for the attribute values was conducted by comparing the information presented in the source data with interactive displays of the data on a computer graphic system. These computer displays depicted and labeled the Channels, Basins, and Anchorages features in different colors based on AV_LEGEND and NAME values for comparison with the original data source. AV_LEGEND is a broad classification of Channels, Basins, and Anchorages features. NAME is the name given to a particular feature. Channels, Basins, and Anchorages features were manually selected and populated with attributes values to identify and describe individual features.
Polygon features conform to the following topological rules. Polygons are single part. There are no duplicate polygons. Polygons do not self overlap. Polygons do not overlap other polygons. 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 2002 edition of the digital National Oceanic & Atmospheric Administration (NOAA) Nautical Charts provided by Maptech, Inc. and the US Army Corps of Engineers (USACOE) Volume 3 - Rivers & Harbors of Rhode Island and Connecticut Project Maps publication dated Sept 1988.. The Channels, Basins, and Anchorages layer is complete in the sense that it accurately reflects the contents of the information available at the time the State of Connecticut, Department of Environmental Protection created the layer. However, compared to more recent information available today or current conditions, the Channels, Basins, and Anchorages layer may be incomplete. This data is not updated.
The horizontal positional accuracy of this data is unknown.
The 2002 National Oceanic & Atmospheric Administration (NOAA) Digital Nautical Charts, once reprojected from their native *.bsb format in decimal degrees into *.tiff files in CT State Plane Corodinates, NAD83, were used as a basemap from which the features of Channels, Basins, and Anchorages were digitzed.
Used as a secondary reference to check the location and names of Channels, Basins, and Anchorages. Also provided information on whether certain areas were Federally maintained or not.
The Channels, Basins, and Anchorages layer is a 1:20,000-scale, polygon feature-based layer that includes the location of channels, basins, and anchorages. Originally published in 2002, this layer is periodically modifed, and different versions have been and may be published over time. Changes made to the entire layer are reflected in the metadata process steps where this source, Source 3 - Channels, Basins, and Anchorage, is cited as both the Source Used and Source Produced.
Feature digitizing and attribution (heads up digitizing method) - Using ESRI ArcView 3 software, channel, basin, and anchorage features appearing on the National Oceanic & Atmospheric Administration (NOAA) 2002 digital charts were manually digitized on the screen (heads-up digitizing) at display scales greater than 1:20,000. Individual features represent polygon areas designated and noted as either channel, turning basin, or anchorage areas. Features were assigned attribute values based on information shown on the digital charts (i.e, cchannel, turning basin, or anchorage ares.) Feature location and attribute accuracy was visually checked and inspected by symbolizing and labeling features according to attribute value on the computer screen as well as using the USACOE Project Maps as secondary verification.
Attribute enhancements - FED_DECODE attribute was added to decode the values found in the FEDERAL attribute field. AREA_SQMI was added to provide the area in square miles.
Dataset moved.
Dataset moved.
Internal feature number.
ESRI
Feature geometry.
ESRI
A text field for symbolizing different feature types on a map
State of Connecticut, Department of Environmental Protection
Dredged channel
Turning basin
Anchorage/mooring area
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
Text field providing the name of any river or stream that a feature may exist in.
State of Connecticut, Department of Environmental Protection
Text field providing the name of any cove, bay, or harbor that a feature may exist in.
State of Connecticut, Department of Environmental Protection
Text field providing the name of any sound that a feature may exist in
State of Connecticut, Department of Environmental Protection
Text field providing, where available, the common name of a feature
State of Connecticut, Department of Environmental Protection
Text field identifying the data source for the feature
State of Connecticut, Department of Environmental Protection
Feature geometry (shape) derived from 2002 NOAA Digital Nautical Charts
Feature geometry (shape) derived from both 2002 NOAA Digital Nautical Charts and the USACOE Project Maps
The name of the data source used to define the feature geometry (e.g., NOAA chart number of USACOE Project map number)
State of Connecticut, Department of Environmental Protection
Calculated area of polygon feature in square miles. Note, AREA_SQMI 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
Text field providing an indication of whether or not a feature is federally maintained
State of Connecticut, Department of Environmental Protection
Feature is federally maintained.
Feature is not federally maintained.
Feature geometry.
ESRI
Numeric field providing an indication of whether or not a feature is federally maintained
State of Connecticut, Department of Environmental Protection
Feature is federally maintained.
Feature is not federally maintained.
Includes features such as channels, turning asins, and anchorages. Information encoded about these features includes type, names, and measurement information and standard cartographic symbology classification schemes. Use NAME to uniquely identify features. Use the AV_LEGEND attribute to symbolize features by type on a map. Use the NAME attribute to label features on a map. To define a layer that only includes a certain type of feature, query Channels, Basins, and Anchorages features for AV_LEGEND value equal to either "channel" OR "basin" OR "anchorage"
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The data distributor does not provide custom GIS analysis or mapping services. Data is available in a standard format and may be converted to other formats, projections, coordinate systems, or selected for specific geographic regions by the party receiving the data.
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