GENERAL NOTES ON GIS DATA:
Planimetric and topographic data was prepared through the use of photogrammetric methods from aerial photography dated April 24, 1999. This data complies with National Map Accuracy Standards (NMAS) and the American Society of Photogrammetry and Remote Sensing (ASPRS) Standards for 1 inch = 40 feet scale mapping with a two foot contour interval.
Cadastral (Parcel) data was compiled from recorded deeds, subdivision plans, and other public records and data following a hierarchy of source reliability. Coordinate geometry (COGO) methods were used to automate the real property data then registered to fit the planimetric layers. Users of these map data are hereby notified that the aforementioned public primary information sources should be consulted for verification of the information contained in these map data. This parcel layer was not used for property assessment purposes nor should this data be use as a surrogate to field survey data.
Primary utility features were collected using conventional and GPS surveying techniques and were located to a horizontal accuracy of one foot horizontal and 0.5 feet vertical. All field procedures will follow Federal Geodetic Control Subcommittee (FGCC) guidelines. Secondary utility features were captured by either photogrammetric methods from aerial photography dated April 24, 1999 at a scale of 1 inch = 40 feet or from digitizing 1 inch = 100 feet scale utility record plans stored and maintained by the Town of Manchester Public Works and Water Departments. Color orthophotography is based on aerial photography dated April 24, 1999 and compiled to be displayed at 1 inch = 100 feet with a 1 foot minimum pixel resolution.
All Town of Manchester data has been projected to the Connecticut State Plane Coordinate System, Zone 3526, Horizontal Datum NAD-83, and Vertical Datum NAVD-88 with US Survey Feet as units.
Data Accuracy is based on National Mapping Accuracy Standards (NMAS) i.e. 90% of welldefined visible features are within tolerance listed. It must be noted, however, that these accuracy tolerances are only suggested and are based on the conversion processes. In no way does this GIS data replace field survey data. The Town of Manchester legally responsible for any features that fall outside these tolerances.
|- This policy document has been prepared to provide, and make available to the public, general information concerning the Town of Manchester’s Geographic Information System (GIS), to establish a rate schedule for GIS map products and electronic data and to define the requirements for electronic data submissions with specified land-use approvals.|
|- List of GIS Data Layers|
If you have any questions, please contact the GIS Coordinator at firstname.lastname@example.org