Keeping Residents Informed with Sex Offender Mapping


The Village of Northbrook’s Police and Geographic Information Systems
(GIS) departments have teamed up to provide residents with an
interactive map showing the locations and information of sex offenders
within the Village. The process of updating this information for the
residents is easily done with GIS. The Police Department notifies GIS
when a new offender has registered within the Village and GIS then
gathers and downloads offender information from the Illinois State
Police website. A Microsoft Excel macro was created to expedite the
process of cleaning up and formatting data downloaded from the State’s
website, making the process even faster.

A custom layer showing the offender location is created using the
offender data and displayed on the village’s interactive mapping
application on their community website, called MapOffice™. MapOffice™
is an excellent method for displaying offender information by showing,
not only the offender’s location, but also allowing users to interact
with the map. Users can click on the offender location and open a
pop-up window displaying a variety of information that is provided by
the State Police, including a picture. MapOffice™ delivers a
centralized source for this information that is easily kept up to date.

The use of GIS technology has allowed the Police Department to
continue its commitment to serving residents by providing effective
services, such as the sex offender interactive map, to help keep
residents safe and informed.​

Digital Terrain Modeling

Blog_DigitalTerrainModeling.pngThe Village of Northbrook, IL has recently contracted an engineering consultant to perform a hydraulic analysis of the Village’s water system. Geographic Information Systems (GIS) was called upon to provide the consultant with all data pertaining to the water system including mains, hydrants, laterals, and valves. In order to provide the Village with highest quality analysis, the consultant required a Digital Terrain Model (DTM) in order to calculate pressures within the water system. A DTM is a digital model or representation of the Earth’s surface which provides elevation information.

The Village of Northbrook did not have a DTM to provide the consultant, nor the time or money to have one created by conventional means, which involves having an airplane fly over an area and record elevation points using lasers. GIS was able to use contour (elevation) data that the Village had previously gathered to create a DTM with acceptable accuracy for the project. The model depicts the higher elevations in red and lower elevations in green. The extreme high and low elevation values in the village, including roadways, bodies of water, and hills, can easily be viewed in the DTM.

Using GIS technology, the Village was able to provide the engineering consultant with the best available data. In return, the Village will get the best available results of the hydraulic analysis to help improve the overall performance of the water system.

Northbrook becomes the 22nd member of the Consortium.

​The Consortium is pleased to announce the membership of the Village of
Northbrook. The Village has a long history when it comes to using GIS.
Two of the reasons cited by the Village for joining was to create a GIS
program that was centralized within the organizations along with one
that supports the needs of their residents. The Consortium congratulates
its 22nd member and is excited to get started.​