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Illinois Height Modernization: Monuments, CORS, and RTK Networks

Web resources for land survey monuments and benchmarks, Continuously Operating Reference Stations (CORS), High Accuracy Reference Network (HARN) providers, and Real Time Kinematic (RTK)) networks in or near Illinois.

NGS CORS using Google Maps.
NGS CORS using Google Maps.
Details for Benchmark LC0155 in Champaign, IL.  Image credit:
Image credit: Details for Benchmark: LC0155
Antenna mounted atop 421 Administration Building (Leica AT504 Pillar w/ Radome).  Image credit: DuPage County Cooperative CORS Network
Image credit: DuPage County Cooperative CORS Network for DP1A.

Land Survey Monuments in Illinois

NGS Datasheet Page
Find a Survey Mark

Illinois Geodetic Control (Beta V2.0)
Map application to access data from NGS NSRS, City of Chicago, USGS Stream Gages, USACE Stream Gages and ILHMP geodetic level lines

USGS Survey Benchmark Information
Not yet available on the Internet.

Geocaching Benchmark Benchmark Hunting
Geocachers track down and photograph benchmarks; search by zip code or Point ID.

HubTack, Inc. Survey Records On-Line
Includes Illinois monument records, GLO Notes, GLO Plats, and County Survey records.

DuPage County Geodetic Control Resources
DuPage County, Illinois Geodetic Vertical Control Network(Map)

Kane County Geodetic Monuments

Aurora, IL City Benchmarks
Aurora City Benchmarks (Map and all Control Monuments)

City of Naperville Land Suvey Monuments
City of Naperville: Survey Monument Locator (Map)

West Chicago Survey Control Network
Horizontal Monument Location Map
Vertical Monument Location Map

CORS, HARN, and RTK Networks in Illinois

National Geodetic Survey CORS
NGS CORS Using Google Maps

KARA Company CORS Sites Information
Coverage throughout Illinois

Coverage for Illinois; engineered for agricultural needs

Seiler Instrument Company: Midwest RTK Network
Coverage for south-central Illinois

Trimble VRS now - USA Illinois Coverage Map
Coverage for Illinois

CORS, HARN, and RTK Networks in Neighboring States

InCORS: Indiana Department of Transporation
Current RTK network of 45 stations, including western Indiana
Indiana HARN
Indiana Hight Accuracy Reference Network
Iowa RTN
RTN network, including eastern Iowa
RTK of Iowa
RTK coverage in central Iowa
KYCORS: Kentucky Transportation Cabinet Division of Highway Design
Geodetic Control in Kentucky
MoDOT: Missouri Department of Transporation
Illinois Stations related to St. Louis area
WISCORS: Wisconsin Department of Transporation
Current reference stations, including southern Wisconsin