Tag Archives: gis

The WestCOG Foundation is currently seeking proposals

The WestCOG Foundation, Inc. is seeking qualified Vendor(s) who have expertise with IT, CAMA, and GIS to create effective parcel data for communities without data and to support and manage a Regional GIS CAMA and Parcel View system (Regional GIS) for the Region. This project is the initial phase in a multi-year effort to support regional cooperation and efficiencies. Continue reading The WestCOG Foundation is currently seeking proposals


Current Projects

WestCOG GIS Portal

The GIS and Analytics Group is upgrading web mapping capabilities for the Region. We are finishing the Portal that allows people to view, select, zoom in, and print information about their local communities.

WestCOG MS4 Stormwater Activities

WestCOG is working with municipalities and partner organizations to prepare communities to meet upcoming municipal separate storm sewer (MS4) permit requirements through collaborative solutions. MS4 mapping will become an important issue in the fall of 2017.


The project archive can be found here.

Project Archive

Project Archives

Ladders of Opportunity

This federally-funded project involved utilizing Census data to determine the relationship between under-served populations and the accessibility of transportation. This overview provides an introduction to the project.

Electric Vehicles Report

This report evaluates passenger vehicle data from the CT DMV to determine the progress of Electric Vehicle (EV) adoption in the WestCOG and spatial relationship between EVs and charging station.

An Analysis of Connecticut Property Appraisal Accuracy

Using data from the Municipal Fiscal Indicators gathered by the Connecticut Office of Policy and Management, this report provides an analysis of property appraisal accuracy in Connecticut by comparing the sales price of properties sold between 2011 and 2014 with their appraised value (report, annex).

Trends in Connecticut Municipal Finance

Using data from the Municipal Fiscal Indicators gathered by the Connecticut Office of Policy and Management, this report tracks local government revenues and tax rates through the years.

Variances in Connecticut Municipal Revenues

Using data from the Municipal Fiscal Indicators collected by the Connecticut Office of Policy and Management (see report titled “Trends in Connecticut Municipal Finance” above), this report investigates unexpected changes in municipal revenues from state transfers.



View the index of all available maps here  . PDF files are large (around 70 – 150 mb) and detailed. You may have issues viewing within a web browser. We would recommend downloading the file and viewing it with PDF software.

click map

RidgefieldMap DanburyMap BrookfieldMap NewFairfieldMap NewMilfordMap ShermanMap BridgewaterMap NewtownMap GreenwichMap BethelMap ReddingMap WestonMap WiltonMap WestportMap NorwalkMap NewCanaanMap DarienMap StamfordMap

GIS and Analytics

GIS & Analytics

The GIS and Analytics Group at WestCOG provides technical and consulting services for the 18 municipalities in the Region along with Mapping and Data information related to transportation, land-use planning, the environment, and demographics.

Our data services page is here.

Our data can be downloaded here.

GIS projects can be found here.

Town maps can be accessed here.

Contact Michael Towle at mtowle@westcog.org for more information.





The GIS and Analytics Group at WestCOG is technically skilled with diverse expertise in a variety of domain areas and data types (e.g. environmental, transportation, and land-use). In addition to GIS skills and software, we have  expertise in data processing, geoprocessing, scripting, image processing, and other analytic areas. Contact Michael Towle at mtowle@westcog.org for more information.


The GIS and Analytics Group at WestCOG can help you conduct your data analyses and mapping visualization using a wide variety of analytic tool, methodologies, and approaches. Our staff has backgrounds in fields like GIS, remote sensing, economics, landscape architecture, geology, natural resources, and environmental science, land-use, and transportation. Call us with your questions.

GIS Training

Municipal Specific Analyses
You might have something specific you want to be able to perform in house. Contact WestCOG to setting up a training.

GIS Basics for Municipal Staff
WestCOG staff can come to your work place, and provide introductory training on ArcGIS Pro, ArcGIS Desktop, and open source software like QGIS

Data Collection
Learn to use Arc Collector (Free with you Arc Subscription) to collect data in the field with your phone.

From Excel to GIS and Back Again
How to get your excel data into GIS, join it with shapefiles, and how to bring it back to excel.

UConn Geospatial Training Program

GIS Groups and Associations



WestCOG Data

CT Data Resources

Additional Data

Analytic Software

WestCOG Data

WestCOG has acquired a robust collection of regional data layers usable for map making, analyses, and planning. Much of it is derived from Planimetrics Data acquired in 2013 (SWRPA) and 2015 (HVCEO). Downloads are available below and by request.


The FTP source page where the files below are stored. Here is a complete listing of publicly available data.

Administrative Areas

Town, regional, congressional, and school district boundaries.


Building foot print polygon data for all towns in WestCOG


Census designated regions include block, block group, and tract shapes for our region.


20, 10, 5, 2, and 1 ft contours for the WestCOG region. Deata derived from 2014 Lidar Data.


Trees, soils, and riparian data


Streams rivers and lakes

Landcover Rasters

DEM, SEM, impervious cover rasters

Land Use Planning

Zoning and open space data collected where available from communities


Parcel data for communities in the WestCOG region.


Culverts and impervious cover totals by town, watershed, catchment areas and parcels.


Pavement polygons, road center lines, and street features.


Rail and bus data

WestCOG Orthoimagery

The most recent imagery for the region is 3″ and 4-band imagery from the 2016 statewide flight and can be obtained on CT Eco. Imagery of the same type is available from the GIS Department for 2013 (SWRPA towns) and 2015 (HVCEO towns). If needed, please contact WestCOG directly to establish a form of data delivery.


Digital Elevation Model (DEM), shows elevation of the surface only and does not represent features such as trees or buildings. Surface Elevation Model (SEM) depicts features as well, including buildings and trees.

Raw Lidar

A large data set not available for download. If needed, please contact WestCOG directly to establish a form of data delivery.

CT Data Resources


Connecticut Environmental Conditions Online (CT ECO) shares imagery and environmental information with the general public through map services.


The primary data source of environmental and natural resource data from the State of Connecticut Department of Energy and Environmental Protection. Home to some unique data sets.


A source of geographic information and Census data and is affiliated with the University of Connecticut library system.

CT Open Data Portal

The data clearinghouse for the State of Connecticut. A source for municipal and state demographics and government oriented data sets (e.g. public safety).

CT Data Collaborative

Striving for informed decision-making across Connecticut. CT Data Collaborative empowers an ecosystem of data users by democratizing access to public data and building data literacy.

Additional Data

Analytic Software