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:
|Rare Species Habitat
Rivers Protection Act Areas
Street Rights Of Way
Street Center Lines
Streets - Pavement Edge
Wards and Precincts
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.
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.
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.