141 South Main Street, Suite 401
Decatur, IL 62523
Phone: (217) 424-1364
Fax: (217) 424-1374
M-F 8:30 a.m. to 4:30 p.m.
excluding legal holidays
A geographic information system (GIS) is a computer based system that is capable of storing, linking and analyzing data that are related by a geographic location. This system allows the users to visualize, question and analyze spatial data. Examples of spatial data include property boundaries, addresses, zoning districts, streets and roads, bike trails, precincts and election districts.
GIS is a tremendously powerful resource which leads to better decision making through improved communication, better record keeping and higher efficiency.
Questions that GIS can help answer include:
- Location: "Where is it?"
- Trends: "What has changed since...?…"
- Patterns: "What spatial patterns exist?"
- Modeling: "What if...…"
Recently the County contracted with the Army Corp of Engineers to
acquire Light Detection and Ranging (LIDAR) data for
the entire county. This data will be used to create a Digital
Eleveation Model (DEM), a three dimensional model of the ground,
that will be submitted to the Federal Emergency Management Agency
(FEMA). FEMA will use this data along with other data collected
in the field to update the County's Digital Flood Insurance Rate
Map (DFIRM). This maps is used by insurers to determine if
flood insurance is need and is also used by the county for building
and subdivision permits. This is not the only use for LIDAR data,
the April issue of GEOWORLD magazine explains how LIDAR is being
used for Natural-Resource and Agricultural Management. Click
on the picture to the right for a link to the online article.
Interactive Mapping Application
Click here for the Interactive Mapping Application
Please visit our downloads page and click on the GIS link on the left hand column for a complete list of the available GIS downloads.