Sidwell to Reproject GIS Data for Henry County, Illinois

April 13, 2009 -- St. Charles, IL – Having a reliable internal land records mapping and workflow management system is a high-priority goal for many county government and assessment agencies across the country. In order to establish an updated digital mapping system that can provide accurate GIS analysis based on newer orthophotography, Henry County, Illinois, has selected The Sidwell Company to provide cadastral reprojection services for enhanced development of the jurisdiction's parcel, soils and land use data. Specifically, Sidwell will reproject Henry County’s current cadastral data (located in 117 designated survey sections) to more updated digital orthophotography and will also convert the county’s soils and land-use data, as well as the cadastral data, to the State Plane Coordinate System, Illinois West Zone, NAD 83 datum. Currently, Henry County’s data resides in an ESRI® personal Geodatabase.

After utilizing a proven process for reestablishing section and quarter-section control points and placing additional control points based on a comparison of the digital orthophotography to corresponding map features, Sidwell will rectify the County’s cadastral and land use data to match those points. While it is important to periodically adjust new and existing layers to confirm to new coordinate data and align these features and layers, from a map maintenance perspective it is also important to minimize changes to the map geometry. Henry County recognized that Sidwell’s solution allows them to retain a high level of data integrity, which will ultimately provide them with more spatially accurate parcel, soil, and land use data layers built upon a current orthophoto base.
Henry County and Monroe County, Illinois, are two jurisdictions who have recently decided to look to GIS professional services firms and have selected Illinois-based Sidwell to address and meet their professional GIS service needs

About Sidwell
The Sidwell Company is an employee-owned firm providing integrated land records management solutions and GIS mapping and software development to local government and private-sector organizations across the United States. Sidwell’s premier parcel mapping solution, Parcel Builder™, is currently used by over 140 customers nationwide. Sidwell also offers a full range of aerial photography and photogrammetric services, and is the Midwest Distributor for Magellan™ GPS products and solutions. For more information about Sidwell services and products call 877.SIDWELL (877.743.9355) or visit

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