GIS Data Dictionary


This dictionary provides basic downloads and descriptions of the map features (data layers) in Newton’s GIS database. For a more complete description of the system and of each layer see the full Data Dictionary document. The layers described are created, edited and stored in ESRI’s geodatabase format but have been converted to more common formats for public use.

GIS files are available to download as shape files or as Open Data on GitHub (GeoJSON format)
How to use these data layers. 

Unless otherwise mentioned, all data layers have the following coordinate information; 
The horizontal datum is NAD83 and the coordinate system is State Plane, Massachusetts - Mainland Zone.
Units are in feet.  The vertical datum (if any) is NGVD29, and the spheroid is GRS1980.



Data Layer Descriptions:

Addresses

Buildings

Census Layers

City Facilities

Conservation Restrictions

Contours

Easements

Fire Stations

FEMA Flood Zones

Floodplains

Historic Districts

Historic Properties

Inspection Districts

MA City And Town Boundaries

MBTA Bus Routes

MBTA Public Transportation Routes

Open Space

Parking Lots

Parking Spaces

Property Boundaries

Railroads
Rare Species Habitat

Rivers Protection Act Areas


Scenic Roads

Schools

School Districts

Soils

Spot Elevations

Streams

Street Rights Of Way

Street Center Lines

Streets - Pavement Edge

Surface Water

Utility Poles

Vernal Pools

Wards and Precincts

Wetlands

Wetland Filings

Wetland Restrictions

Zip Codes

Zoning

 

Working with GIS data

A Shapefile is a GIS data format. Newton’s shapefiles were created using ArcGIS, a GIS software package from Esri. Shapefiles can be used in most GIS and CAD software packages. If you do not have GIS or CAD software here are some free tools you can use to work with these shapefiles. All GIS tools have a bit of a learning curve and there is no perfect solution. Click on the tool name for more information.

Desktop Tools

ArcGIS Explorer – a free Esri tool with a steep learning curve - Windows only

UDig - a simple GIS viewer

MapWindow – another simple viewer with some added GIS functions

QGIS – a full featured GIS software package that works in Windows or Mac, also a steep learning curve. 

Web Tools

CartodB – a service that allows you to set up custom online maps using shape files, GeoJSON and .csv among other formats. Free for up to 50MB of data. Subscription pricing beyond that.

Shape Escape – allows you to convert shape files to Fusion Tables for use in Google Maps.

GitHub – You can open the GeoJSON files, one at a time and browse each layer. Also lets you download the files in this format for use in various other web applications such as CartodB.

 

 

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