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Connecticut Parcels for Protected Open Space Mapping

Frequently-asked questions:


What does this data set describe?

Title:
Connecticut Parcels for Protected Open Space Mapping

Abstract:
Connecticut Parcels for Protected Open Space Mapping is a polygon feature-based layer that includes basic parcel-level information for some towns in Connecticut. This parcel layer includes information provided by individual municipalities.

These parcel data are incomplete and out of date. The accuracy, currency and completeness of the data reflect the content of the data at the time DEEP acquired the data from the individual municipalities. Attribute information is comprised of values such as town name and map lot block number. These data are not updated by CT DEEP and should only be used as a general reference. Critical decisions involving parcel-level information should be based on more recently acquired information from the respective municipalities. These parcels are not to be considered legal boundaries such as boundaries determined from certain classified survey maps or deed descriptions. Parcel boundaries shown in this layer are based on information from municipalities used for property tax purposes.

Largely due to differences in horizontal accuracy among various data layers, do not expect these parcel boundaries to line up exactly with or be properly postioned relative to features shown on other layers available from CT DEEP such as scanned USGS topography quadrangle maps, roads, hydrography, town boundaries, and even orthophotograpy.

Supplemental information:
This dataset includes parcel information for the following towns: Andover, Ansonia, Ashford, Avon, Beacon Falls, Berlin, Bethany, Bethel, Bethlehem, Bloomfield, Bolton, Branford, Bridgewater, Brookfield, Brooklyn, Canaan, Canterbury, Canton, Chaplin, Cheshire, Chester, Clinton, Colchester, Colebrook, Columbia, Cornwall, Coventry, Cromwell, Danbury, Darien, Deep River, Derby, East Granby, East Haddam, East Hampton, East Hartford, East Lyme, East Windsor, Eastford, Ellington, Enfield, Essex, Farmington, Franklin, Glastonbury, Granby, Greenwich, Griswold, Groton, Guilford, Haddam, Hamden, Hartford, Hebron, Kent, Killingly, Killingworth, Lebanon, Ledyard, Lisbon, Litchfield, Lyme, Madison, Manchester, Mansfield, Marlborough, Meriden, Middlebury, Middlefield, Middletown, Milford, Monroe, Montville, Morris, New Britain, New Canaan, New Hartford, New Haven, New London, New Milford, Newington, Newtown, Norfolk, North Branford, North Canaan, North Haven, North Stonington, Norwalk, Norwich, Old Lyme, Old Saybrook, Orange, Oxford, Plainfield, Plainville, Plymouth, Pomfret, Portland, Preston, Prospect, Putnam, Redding, Rocky Hill, Roxbury, Salem, Salisbury, Scotland, Seymour, Sharon, Shelton, Sherman, Simsbury, Somers, South Windsor, Southbury, Southington, Sprague, Stamford, Sterling, Stonington, Stratford, Suffield, Thomaston, Tolland, Torrington, Union, Vernon, Voluntown, Wallingford, Warren, Washington, Waterbury, Waterford, Watertown, West Hartford, West Haven, Westbrook, Westport, Wethersfield, Willington, Wilton, Winchester, Windsor, Windsor Locks, Wolcott, Woodbridge, Woodbury, and Woodstock.
	
For additional information on the Protected Open Space Mapping project, contact the Department of Energy and Environmental Protection, Division of Land Acquisition and Management at 860-424-3016.

  1. How should this data set be cited?

    Connecticut Municipalities (data source and original compiler), State of Connecticut, Department of Energy and Environmental Protection (data publisher), 20100810, Connecticut Parcels for Protected Open Space Mapping: State of Connecticut, Department of Environmental Protection, Hartford, Connecticut, USA.

    Online links:
  2. What geographic area does the data set cover?

    Bounding coordinates:
    West: -73.765044
    East: -69.033339
    North: 43.503389
    South: 40.928052

  3. What does it look like?

    http://www.cteco.uconn.edu/metadata/dep/browsegraphic/parcelfullview.gif (GIF)
    Community view of Parcel features. Includes information in towns that DEP has inventoried for protected open space.

    http://www.cteco.uconn.edu/metadata/dep/browsegraphic/parceldetailview.gif (GIF)
    Detail view of Parcel features

  4. Does the data set describe conditions during a particular time period?

    Beginning date: unknown
    Ending date: unknown
    Currentness reference:
    When CT DEP obtained data from municipalities

  5. What is the general form of this data set?

    Geospatial data presentation form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      Indirect spatial reference:
      map block lot

      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (1020366)

    2. What coordinate system is used to represent geographic features?

      The map projection used is Lambert Conformal Conic.

      Projection parameters:
      Lambert Conformal Conic
      Standard parallel: 41.200000
      Standard parallel: 41.866667
      Longitude of central meridian: -72.750000
      Latitude of projection origin: 40.833333
      False easting: 999999.999996
      False northing: 499999.999998

      Planar coordinates are encoded using coordinate pair.
      Abscissae (x-coordinates) are specified to the nearest 0.000250.
      Ordinates (y-coordinates) are specified to the nearest 0.000250.
      Planar coordinates are specified in survey feet.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

      Vertical coordinate system definition:
      Altitude system definition:
      Altitude resolution: 1.000000
      Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    Connecticut Parcels for Protected Open Space Mapping
    Property parcels (Source: Connecticut municipalities)

    OBJECTID
    Internal feature number. (Source: ESRI)
                      

    Sequential unique whole numbers that are automatically generated.

    TOWN
    Town - Town (municipality) name (Source: State of Connecticut, Office of the State Controller)
                      

    TOWN_NO
    Town Number - ID number for the Connecticut Town (municipality), based on the Town Codes issued by the State of Connecticut, Office of the State Controller, which range from 1 to 169. (Source: State of Connecticut, Office of the State Controller)
                      

    Range of values
    Minimum:1
    Maximum:169

    MBL
    Map Block Lot - The format and structure of map lot block values vary depending on the municipality. Depending on the municipality, this field may or may not be populated. (Source: Data values from respective municipality)
                      

    PIN
    Property Identification Number. May be in lieu of or in addition to map block lot number. Depending on the municipality, this field may or may not be populated. (Source: Data values from respective municipality)
                      

    LOCATION
    Street name - Depending on the municipality, this field may or may not be populated. (Source: Data values from respective municipality)
                      

    ACRES
    Parcel Acreage - Software calculated acreage value base on parcel geometry and shape. (Source: State of Connecticut, Department of Environmental Protection)
                      

    SHAPE
    Feature geometry. (Source: ESRI)
                      

    Coordinates defining the features.

    SHAPE.area
     (Source: ESRI)
                      

    SHAPE.len
     (Source: ESRI)
                      

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Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)


  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    State of Connecticut, Department of Energy and Environmental Protection, Land Acquisition and Management
    79 Elm Street
    Hartford, Connecticut 06106-5127
    USA

    860-424-3016 (voice)
    860-418-5906 (FAX)
    Hours of Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
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Why was the data set created?

This parcel layer is used by the Department of Energy and Environmental Protection, Division of Land Acquisition and Management as a data source for creating a statewide layer of permanently protected open space for the Protected Open Space Mapping (POSM) project. The statewide layer of permanently protected open space includes a small subset of parcels from this layer.

The data in the parcel layer was obtained from individual Connecticut municipalities. An effort was made to collect data once from each municipality. The data acquisition date for each set of municipally-supplied parcel data was not recorded and CT DEEP does not keep this information up-to-date. Consequently, these data are out-of-date, incomplete and do not reflect the current state of property ownership in these municipalities. These parcels are not to be considered legal boundaries such as boundaries determined from certain classified survey maps or deed descriptions. Parcel boundaries shown in this layer are based on information from municipalities used for property tax purposes. Parcel boundaries and attribute information have not been updated in this layer since the time the information was originally acquired by CT DEEP. For example, property boundaries are incorrect where subdivisions have occurred. Also, field attribute values are populated only if the information was supplied to CT DEEP. For example, parcels in some towns lack location (street name) information or possibly map lot block values. Therefore, field attributes are inconsistent, may include gaps, and do not represent complete sets of values among all towns. They should not be compared and analyzed across towns. It is emphasized that critical decisions involving parcel-level information be based on more recently obtained information from the respective municipalities. These data are only suitable for general reference purposes. Be cautious when using these data. Many Connecticut municipalities provide access to more up-to-date and more detailed property ownership information on the Internet.

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How was the data set created?

  1. Where did the data come from?

    Source 1 - Parcel Data from Towns (source 1 of 2)

    Individual Towns in Connecticut, Unknown, Parcel Data from Towns.

    Type of source media: disc
    Source scale denominator: Varied
    Source contribution:
    This source includes all of the parcel data received from towns.  This data was received at different times depending on its availability from each town.  It is not uniform in terms of attribute information or spatial topology among towns.  Although most of the data was received in Geodatabase or Shapefile format, some towns' data was in CAD format that was converted to polygon feature data after its receipt by the Department of Energy and Environmental Protection.

    Source 2 - Connecticut Parcels for Protected Open Space Mapping Feature Class (source 2 of 2)

    Connecticut Parcels for Protected Open Space Mapping Feature Class.

    Type of source media: disc
    Source scale denominator: Varied
    Source contribution:
    Final feature class of parcels.  

  2. What changes have been made?

    Date: 9/30/2008 (change 1 of 3)
    Collected and compiled spatial and attribute data from individual towns into a single feature class.  

    Person responsible for change:
    Connecticut Department of Environmental Protection
    79 Elm Street
    Hartford, CT 06106
    United States

    860-424-3016 (voice)
    860-424-4058 (FAX)
    Hours of Service: 08:30 to 16:30 Monday through Friday

    Data sources used in this process:
    • Source 1 - Parcel Data from Towns

    Data sources produced in this process:
    • Source 2 - Connecticut Parcels for Protected Open Space Mapping Feature Class

    Date: 9/30/2008 (change 2 of 3)
    Replaced parcel data for Tolland.
    Added Brookfield.

    Person responsible for change:
    Eric Apgar
    Connecticut Department of Environmental Protection
    GIS Analyst (Durational)
    79 Elm Street
    Hartford, CT 06106
    United States

    860-424-3016 (voice)
    860-424-4058 (FAX)
    Hours of Service: 08:30 to 16:30 Monday through Friday

    Data sources used in this process:
    • Source 1 - Parcel Data from Towns

    Data sources produced in this process:
    • Source 2 - Connecticut Parcels for Protected Open Space Mapping Feature Class

    Date: 11/17/2008 (change 3 of 3)
    Replaced parcel data for East Windsor, Ellington and Tolland. 
    Added Brooklyn, Chaplin, Cornwall, Danbury, Griswold, Haddam, Killingly, Lebanon, Middlefield, Monroe, New Milford, Norfolk, Plainfield, Portland, Redding, Scotland, Sharon, Sprague, Sterling, Torrington, Union, Warren, Willington, Woodstock.

    Person responsible for change:
    Eric Apgar
    Connecticut Department of Environmental Protection
    GIS Analyst (Durational)
    79 Elm Street
    Hartford, CT 06106
    United States

    860-424-3016 (voice)
    860-424-4058 (FAX)
    Hours of Service: 08:30 to 16:30 Monday through Friday

    Data sources used in this process:
    • Source 1 - Parcel Data from Towns

    Data sources produced in this process:
    • Source 2 - Connecticut Parcels for Protected Open Space Mapping Feature Class

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How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    The accuracy, currency and completeness of the data reflects the content of the data at the time it was acquired from the individual municipalities. The data in the parcel layer was obtained from individual Connecticut municipalities. An effort was made to collect data once from each municipality. The data acquisition date for each set of municipally-supplied parcel data was not recorded and CT DEEP does not keep this information up-to-date. Consequently, these data are out-of-date, incomplete and do not reflect the current state of property ownership in these municipalities. These parcels are not to be considered legal boundaries such as boundaries determined from certain classified survey maps or deed descriptions. Parcel boundaries shown in this layer are based on information from municipalities used for property tax purposes. Parcel boundaries and attribute information have not been updated in this layer since the time the information was originally acquired by CT DEEP. For example, property boundaries are incorrect where subdivisions have occurred. Also, field attribute values are populated only if the information was supplied to CT DEEP. For example, parcels in some towns lack location (street name) information or possibly map lot block values. Therefore, field attributes are inconsistent, may include gaps, and do not represent complete sets of values among all towns. They should not be compared and analyzed across towns. It is emphasized that critical decisions involving parcel-level information be based on more recently obtained information from the respective municipalities. These data are only suitable for general reference purposes. Be cautious when using these data. Many Connecticut municipalities provide access to more up-to-date and more detailed property ownership information on the Internet. Consequently, when compared to more recent parcel information available today from the municipalities, this parcel layer is incomplete, out-of-date and should be used with caution.

  2. How accurate are the geographic locations?

    The horizontal positional accuracy of this data is unknown.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    The completeness of the data reflects the content of the data when acquired from the individual municipalities. Parcel boundaries and attribute information have not been updated in this layer since the time the information was originally acquired. Consequently, when compared to more recent parcel information available today from the municipalities, this parcel layer is incomplete and should be used with extreme caution.

  5. How consistent are the relationships among the observations, including topology?

    No automated procedures or tests were performed to enforce any polygon feature topology rules. When combining parcel data from multiple towns, the overall intent was to preserve the geometry and shape of the original parcel data. In general, expect polygon features to be single part. Duplicate features or features that self overlap may be present because DEEP made no effort to remove these anomalies if they exist. Most importantly, expect parcel polygon features along the boundary of one town to overlap adjacent parcels in the bordering town.

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How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access constraints: None. No restrictions or legal prerequisites for accessing the data. The data is in the public domain and may be redistributed.
Use constraints:
None. No restrictions or legal prerequisites for using the data after access is granted. The data in the parcel layer was obtained from individual Connecticut municipalities. An effort was made to collect data once from each municipality. The data acquisition date for each set of municipally-supplied parcel data was not recorded and CT DEEP does not keep this information up-to-date. Consequently, these data are out-of-date, incomplete and do not reflect the current state of property ownership in these municipalities. These parcels are not to be considered legal boundaries such as boundaries determined from certain classified survey maps or deed descriptions. Parcel boundaries shown in this layer are based on information from municipalities used for property tax purposes. Parcel boundaries and attribute information have not been updated in this layer since the time the information was originally acquired by CT DEEP. For example, property boundaries are incorrect where subdivisions have occurred. Also, field attribute values are populated only if the information was supplied to CT DEEP. For example, parcels in some towns lack location (street name) information or possibly map lot block values. Therefore, field attributes are inconsistent, may include gaps, and do not represent complete sets of values among all towns. They should not be compared and analyzed across towns. It is emphasized that critical decisions involving parcel-level information be based on more recently obtained information from the respective municipalities. These data are only suitable for general reference purposes. Be cautious when using these data. Many Connecticut municipalities provide access to more up-to-date and more detailed property ownership information on the Internet. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Energy and 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.

Distributor 1 of 1

  1. Who distributes the data set?

    State of Connecticut, Department of Energy and Enviromental Protection
    79 Elm Street
    Hartford, Connecticut 06106-5127
    USA

    860-424-3540 (voice)
    860-424-4058 (FAX)
    dep.gisdata@ct.gov
    Hours of Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time

  2. What's the catalog number I need to order this data set?

    Connecticut Parcels for Protected Open Space Mapping

  3. What legal disclaimers am I supposed to read?

    The data in the parcel layer was obtained from individual Connecticut municipalities. An effort was made to collect data once from each municipality. The data acquisition date for each set of municipally-supplied parcel data was not recorded and CT DEP does not keep this information up-to-date. Consequently, these data are out-of-date, incomplete and do not reflect the current state of property ownership in these municipalities. These parcels are not to be considered legal boundaries such as boundaries determined from certain classified survey maps or deed descriptions. Parcel boundaries shown in this layer are based on information from municipalities used for property tax purposes. Parcel boundaries and attribute information have not been updated in this layer since the time the information was originally acquired by CT DEP. For example, property boundaries are incorrect where subdivisions have occurred. Also, field attribute values are populated only if the information was supplied to CT DEP. For example, parcels in some towns lack location (street name) information or possibly map lot block values. Therefore, field attributes are inconsistent, may include gaps, and do not represent complete sets of values among all towns. They should not be compared and analyzed across towns. It is emphasized that critical decisions involving parcel-level information be based on more recently obtained information from the respective municipalities. These data are only suitable for general reference purposes. Be cautious when using these data. Many Connecticut municipalities provide access to more up-to-date and more detailed property ownership information on the Internet. Although these data have 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.

  4. How can I download or order the data?

    • Availability in digital form:


    • Data format:
      in format Shapefile, Feature Class (version ArcGIS)
      Network links:http://www.ct.gov/deep

    • Cost to order the data: An online copy of the data may be accessed without charge.


  5. Is there some other way to get the data?

    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.

  6. What hardware or software do I need in order to use the data set?

    Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.

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Who wrote the metadata?

Dates:
Last modified: 20111208

Metadata author:
Suzanne Barkyoumb
State of Connecticut, Department of Energy and Environmental Protection, Land Acquistion and Management
79 Elm Street
Hartford, Connecticut 06106-5127
USA

860-424-3016 (voice)
860-418-5906 (FAX)
Hours of Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata(FGDC-STD-001-1998)

Metadata extensions used:
  • http://www.esri.com/metadata/esriprof80.html

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