Geographic Information Systems

The primary responsibility of the DSET GIS team is to update and maintain the GIS spatial mapping data used for locating Connecticut’s 9-1-1 calls.

Other responsibilities include map production and GIS support for the rest of DESPP.


9-1-1 GIS Metrics

Street Centerline Updating — DSET continues to collect and process street and address updates that have been provided by the towns and PSAPs. DSET has updated/verified a total of 78,123 street segments since taking over the updating process from Tele Atlas. Please contact Dan Czaja, GIS Coordinator, at (860) 685-8131 or to submit a correction or for further information.

Address Points added to Next Generation 9-1-1 (NG 9-1-1) system – DSET is adding GIS building and tax parcel center address points for many of Connecticut’s municipalities to the new NG 9-1-1 system. This new GIS dataset will be used in conjunction with the GIS street centerline to further improve call location accuracy.

Legacy 9-1-1 ALI Geocoding Results – DSET continues to improve the geocoding match rate for the ALI database in the Legacy 9-1-1. As of January 1st, the geocoding match rate has reached 98.71% of all ALI records geocoded.

Next Generation 9-1-1 ALI Geocoding Results – With the addition of address points, DSET is able to improve the geocoding match rate for the ALI database in the Next Generation 9-1-1 system. As of January 1st, the geocoding match rate has reached 99.07% of all ALI records geocoded.


9-1-1 Master Street Address Guide Updating

DSET GIS continues to provide updates and research support for the Master Street Address Guide (MSAG) used in the 9-1-1 system. To date, DSET has provided approximately 1,000 MSAG update requests to AT&T and now Frontier Communications since 2010.


2016 Statewide Orthoimagery Flight

The Department of Emergency Services and Public Protection (DESPP) has signed a memorandum of understanding with the Department of Transportation (DOT), the Office of Policy and Management (OPM) and the Capitol Region Council of Governments (CRCOG), on behalf of all state Councils of Governments (COGs), to procure a statewide high-resolution aerial orthoimagery dataset. The acquisition flight for the dataset is currently scheduled to be flown in the spring 2016 (leaf-off conditions) and will cover all of Connecticut (approximately 5,266 square miles). The orthoimagery will be three inch resolution and consist of 4-bands, containing true color and near infrared. The project will be jointly funded by DESPP, DOT, and the COGs, will be publicly available without license restrictions, and will support the various missions of State, Regional, and Municipal government.


Connecticut State Police Mapping

DSET GIS has been assisting the Connecticut State Police (CSP) with its mapping needs. As of February, 2015, the CSP have been using a customized version of the 9-1-1 street centerline GIS dataset for their Computer Aided Dispatch (dataset has since been updated). DSET GIS has also assisted CSP with the mapping and analysis of rural road accident data and 2015 Hartford homicides.


GIS Support for CT Alert

DSET continues to work with the state's emergency notification system vendor, Everbridge, to support the GIS portion of CT Alert system. To date, DSET has been able to locate over 84% of Everbridge’s unmatched opt-in registrations and has begun the process to perform all geocoding for the CT Alert system.