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Water Distribution System, Points - City of Newton
- Identification Information
- Data Quality Information
- Spatial Data Organization Information
- Spatial Reference Information
- Entity and Attribute Information
- Distribution Information
- Metadata Reference Information
- Identification Information
- Citation
- Originator
- City of Newton GIS
- Publication Date
- 1998
- Title
- Water Distribution System, Points - City of Newton
- Geospatial Data Presentation Form
- vector digital data
- Online Linkage
- https://hgl.harvard.edu/catalog/harvard-nwtnwatrndpt
- Abstract
- This data layer contains data for various types of point features, including water valves, meter pits, blow offs, pump stations, and water towers of Newton's water distribution system. A second, related layer (Water Distribution System, Lines) includes data for system mains and pipes.
- Purpose
- This layer is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. This layer will provide a basemap for layers related to utilities and municipal engineering purposes as well as urban planning or public works purposes (including defining boundaries, managing assets and facilities, integrating attribute databases with geographic features, spatial analysis, and presentation output.)
- Supplemental Information
- The city will be maintaining this data layer using information from city crews and from contractor crews. The current intent is for this maintenance to be performed using the V7ARC application purchased from Hansen, Inc. At this time that application is not working correctly, and maintenance is not occurring.
- Temporal Extent
- Currentness Reference
- approximate ground condition
- Time Instant
- 1998
- Bounding Box
- West
- -71.267859
- East
- -71.158251
- North
- 42.366163
- South
- 42.288243
- ISO Topic Category
- utilitiesCommunication
- Theme Keyword
- Municipal
- Theme Keyword Thesaurus
- HGL Category Keyword Thesaurus
- Theme Keyword
- Water distribution
- Water pipes
- Hydrants
- Pumping stations
- Water towers
- Water-supply engineering
- Theme Keyword Thesaurus
- LCSH
- Place Keyword
- Newton
- Massachusetts
- Place Keyword Thesaurus
- GNIS
- Temporal Keyword
- Access Restrictions
- Access is granted to licensee (Harvard University) only. Available only to Harvard University affiliates.
- Use Restrictions
- For educational, non-commercial use only.
- Status
- Complete
- Maintenance and Update Frequency
- As needed
- Point of Contact
- Contact Organization
- City of Newton GIS
- Delivery Point
- Information Technology Department
- Delivery Point
- City Hall Room 107
- Delivery Point
- 1000 Commonwealth Avenue
- City
- Newton Center
- State
- MA
- Postal Code
- 02459-1400
- Country
- USA
- Contact Telephone
- 617-796-1180
- Contact Telephone
- 617-796-1000
- Credit
- GIS data supplied by City of Newton GIS.
- Native Data Set Environment
- Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 6; ESRI ArcCatalog 8.2.0.700
- Data Quality Information
- Attribute Accuracy Report
- Hydrant attributes originally included the same hydrant number that appeared in the Engineering Dept. version of the atlas. However it turned out that these numbers were unique only within an atlas sheet. Therefore, the hydrants were re-numbered with a unique sequential number.
- Logical Consistency Report
- For layers containing line or polygon features, Newton's data layers are "topologically clean". This was verified with Arc/Info software version 7.x in 1998 and is an ongoing part of data maintenance for the relevant data layers.
- Horizontal Positional Accuracy Report
- Valve locations mapped based on photogrammetric locations have an absolute accuracy of +/- 2.5 feet. Each valve has an attribute indicating whether its location was moved to that of a photo location. The accuracy of the other valve locations is unknown. The intent, with respect to the accuracy of the water main locations, was only to ensure that if a main existed in a street right-of-way or between two valves, it appeared in the GIS data layer. In cases where a main connects two valves whose position was mapped from the aerial photography in a straight line, the main may be within 2 ? feet of its actual location. The information below is from the J. W. Sewall Co. Aerial Photography Proposal Documents: Scale of Photography: 1:7200 Forward Overlap: 60% average within 5 feet. Side Overlap: 30% average within 10 feet Tilt: Not to exceed 3 degrees - 4 degrees between flight lines Crab: Not to exceed 3 degrees relative to flight line Contact Prints: 9" x 9" received from company. Ground Control: Primary - 12 permanent control markers set - 36" concrete monuments. GPS network of 50 stations with three horizontal and nine vertical ties to grid. Network tied to MSPCS NAD83 datum and NGVD29 datum by occupying Mass. Highway Department control points. Block Adjustment Accuracy: Horizontal: second order class I; Vertical: third order Model: ALBANY-Lite Final Pixel Size: 12 inches Final Horizontal Accuracy: Approximately +/- 5 feet.
- Lineage
- Source
- Originator
- James W. Sewall Co.
- Publication Date
- 1998
- Title
- James W. Sewall Co. Aerial Photography
- Source Scale Denominator
- 7200
- Type of Source Media
- stable-base material
- Source Temporal Extent
- Time Period Information
- Single Date/Time
- Calendar Date
- 19940415
- Source Currentness Reference
- ground condition
- Contribution
- Mapping of water/sewer/drain infrastructure based on targets painted on the streets, conducted by the James W. Sewall Co. The aerial photographs were taken on April 15, 1994. The photographs were produced at a scale of 1" = 600' at an approximate altitude above datum of 3,600 feet.
- Source
- Originator
- SEA Consultants
- Publication Date
- Unknown
- Title
- Water System CAD Files
- Type of Source Media
- computer program
- Source Temporal Extent
- Time Period Information
- Single Date/Time
- Calendar Date
- 1991
- Source Currentness Reference
- ground condition
- Contribution
- 31 CAD files (one per map sheet) of the water system were converted from DXF format to Arc/Info format and merged into a single data layer. Arc-node topology was created from the node and line symbol layers in the CAD files
- Spatial Data Organization Information
- Direct Spatial Reference Method
- Vector
- Point and Vector Object Information
- SDTS Terms Description
- SDTS Point and Vector Object Type
- Entity point
- Point and Vector Object Count
- 8084
- Spatial Reference Information
- Horizontal Coordinate System Definition
- Planar
- Grid Coordinate System
- Grid Coordinate System Name
- State Plane Coordinate System
- State Plane Coordinate System
- SPCS Zone Identifier
- 2001
- Lambert Conformal Conic
- Planar Coordinate Information
- Planar Coordinate Encoding Method
- coordinate pair
- Coordinate Representation
- Abscissa Resolution
- 0.000476
- Ordinate Resolution
- 0.000476
- Planar Distance Units
- survey feet
- Geodetic Model
- Horizontal Datum Name
- North American Datum of 1983
- Ellipsoid Name
- Geodetic Reference System 80
- Semi-major Axis
- 6378137.000000
- Denominator of Flattening Ratio
- 298.257222
- Vertical Coordinate System Definition
- Altitude System Definition
- Altitude Datum Name
- National Geodetic Vertical Datum of 1929
- Altitude Resolution
- 1.000000
- Altitude Encoding Method
- Explicit elevation coordinate included with horizontal coordinates
- Entity and Attribute Information
- Entity Type
- Entity Type Label
- Water Network Nodes
- Entity Type Definition
- ESRI Shapefile. Points represent network point features
- Entity Type Definition Source
- ESRI, Newton GIS
- Attributes
- ARC_
- Internal number for node feature
- Sequential unique positive integer
- Definition Source
- ESRI
- WLINES_
- Internal Feature Identifier
- Definition Source
- ESRI
- WLINES_ID
- Internal Feature Identifier
- Sequential unique positive integer
- Definition Source
- ESRI
- NWTNWATRNDPT.AREA
- Area of feature in square coverage units
- Attribute Value Accuracy
- Value will always be zero
- Attribute Value Accuracy Explanation
- Point features have no area
- PERIMETER
- Perimeter of feature in coverage units
- Attribute Value Accuracy
- Value will always be zero
- Attribute Value Accuracy Explanation
- Point features have no perimeter
- COMP_TYPE
- Component type as used by the Hansen IMS database
- 42
- Water Meter
- 43
- Water Node
- 44
- Water Pump Station
- 46
- Water Valve
- 67
- Water Tower
- Definition Source
- Hansen IMS
- WV_TYPE
- Type of water valve
- CHECK
- Check Valve
- GATE
- BLOW
- Blow Off
- Definition Source
- Newton GIS
- WV_STATUS
- Status of a valve (WV or Water Valve)
- OP
- Open
- CL
- Closed
- Definition Source
- Newton GIS
- WND_TYPE
- Node type
- TEE
- CROSS
- RED
- Reducer
- END
- Pipe End
- Definition Source
- Hansen IMS, Newton GIS
- Attribute Value Accuracy
- Hansen terminology since in Arc/Info all arc junctions are nodes
- Attribute Value Accuracy Explanation
- In Hansen terms these are nodes that are not a valve
- MOVED
- Valve feature's location was adjusted to match that of a point mapped photogrammetrically from aerial photography
- Y
- Valve feature's location was adjusted
- N
- Valve feature's location was not adjusted
- Definition Source
- Newton GIS
- UNITID
- Unique numeric identifier for each feature
- Sequential unique positive integer
- Definition Source
- Newton GIS
- COMPTYPE
- Component type as used by the Hansen IMS database
- 42
- Water Meter
- 43
- Water Node
- 44
- Water Pump Station
- 46
- Water Valve
- 67
- Water Tower
- Definition Source
- Hansen IMS
- COMPKEY
- Unique identifier in the Hansen IMS database
- Definition Source
- Hansen IMS
- NWTNWATRNDPT.FID
- Internal feature number. (Sequential unique whole numbers that are automatically generated.)
- Definition Source
- ESRI
- SHAPE
- Feature geometry. (Coordinates defining the features.)
- Definition Source
- ESRI
- Distribution Information
- Format Name
- Shape
- Distributor
- Harvard Geospatial Library
- Name
- Metadata Reference Information
- Metadata Date
- 20021017
- Metadata Contact
- Contact Information
- Contact Person Primary
- Contact Person
- Contact Organization
- Harvard Geospatial Library
- Contact Address
- Address
- Office of Information Systems
- Address
- 1280 Massachusetts Avenue
- City
- Cambridge
- State or Province
- MA
- Postal Code
- 02138
- Country
- USA
- Contact Voice Telephone
- 617-295-12417
- Contact Facsimile Telephone
- 617-496-0440
- Contact Electronic Mail Address
- hgl_ref@hulmail.harvard.edu
- Metadata Standard Name
- FGDC Content Standards for Digital Geospatial Metadata
- Metadata Standard Version
- FGDC-STD-001-1998
- Metadata Extensions
- Online Linkage
- http://www.esri.com/metadata/esriprof80.html
- Profile Name
- ESRI Metadata Profile
