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Indiana Department of Transportation

INDOT Continuously Operating Reference Stations (InCORS)

Intro |  Data |  Real Time (RTK) |  System Status |  FAQ |  Links |  LASO

Frequently Asked Questions

How many stations does INDOT operate?
The InCORS consists of 45 stations located across the state collecting data continuously.

What type of GNSS equipment do the InCORS sites use and do they support GLONASS?
The InCORS Stations Consist of a Leica GRX 1200 PRO receiver with Leica 1202GG antenna. All of the stations consist of GLONASS compatible receivers.

What is the availability of the data and what type of data and sampling rates are provided?
The stations are designed to be in operation 24 hours a day 7 days a week. The data is collected at the receiver at a 1 second interval. The data is streamed in real time to a central location where the integrity of the data is monitored before it is written to a RINEX file. The InCORS website is designed to provide the user with a RINEX data set at 1 hour intervals containing a sampling rate of 1 second.

What is the current proxy server IP address?
As of July 12, 2012 the IP address is 108.59.49.226.

Vendor Suggestions for InCORS Network Users Regarding the Transition to NGS NAD83(2011)2010.0000 Reference Frame
Sokkia’s statement:
We should be using NAD83(2011) after the switchover, if that option doesn’t exist in the end users software they need to upgrade their software to the latest version of SSF or Magnet available for their data collector. Some data collectors will not be able to work with this new datum if they cannot be upgraded to recent software releases. If software is unable to be upgraded then end user will have to localize. TOPCON’s statement:
When using the INDOT INCORS network for RTK work each job should be setup as “NAD83 NO TRANS”, do not to select “NAD83(2011)”. If that option doesn’t exist in the end users software they need to upgrade their software to the latest version of Magnet or TopSURV available for their data collector. Some data collectors will not be able to work with this new datum if they cannot be upgraded to recent software releases. If software is unable to be upgraded then end user will have to localize.
TRIMBLE’s statement:
When using the INDOT INCORS network for RTK work each job should be setup as “NAD83”, do not select “NAD83(2011)”.
Carlson SurvCE w/ Carlson Rover Users:
The critical thing is for the user to create a new Geoid 2012A file to use. If they don’t currently use a Geoid in Equip / Localization under the GPS tab and they normally localize to points in the “Points” tab then they would just need to stakeout to known control points on existing jobs.
If using the updated version of Carlson Survey 2013 you can go to Survey / Data Collectors / Prepare Geoid.
Or in the new version of Carlson X-port on our website you can use the Tools / Geoid Manager also.
Both of these routines in our current Office Software support Geoid 2012A.

How long does it take to post the RINEX data from the InCORS to the website?
The data for the previous hour is posted to the website 35 minutes after the hour. ( i.e. 7:00 a.m. to 8:00 a.m. data is available for download by 8:35 a.m.)

How far back can I retrieve data for a particular site?
Data is available from our website for 1 month. We can not reproduce data which is more than 1 month old.

How are these stations positioned?
The 45 stations were positioned relative to other CORS stations (ITRF and NAD 83). As of April 5, 2013 the base reference frame for the stations is NAD83(2011) Epoch 2010.0. Prior to that date and time the base reference frame was NAD83(CORS96) Epoch 2002.0. For more information regarding the transition to NAD83(2011) Epoch 2010.0 the LINKS page of this website contains a recorded version and pdf file of the informational webinar that was held on March 5, 2013. A listing of the coordinates for each station can be found on either the REAL TIME (RTK) page or the DATA page of this website

What Antenna Height do I use when using an InCORS site?
All the Elevations are to the A.R.P. (Antenna Reference Plane a.k.a. Mechanical Reference Plane (M.R.P.)). If using the coordinates relative to the Indiana HARN, the antenna height would be "0.0 m". All Ellipsoidal heights published are listed to the A.R.P.

Why are Indiana State Plane coordinates not available and published for the InCORS sites?
When using CORS sites, stations from different zones are accessed which could lead to a potential for processing using the coordinates of different zones. All data processing software accepts Latitude and Longitude for its input.

Is there a cost involved with using the system?
No, the Indiana Department of Transportation uses this data for its daily activities and provides the data to users as a public service.

RTK Access
To get access to our RTK Service you must first agree to our User Agreement and Data Disclaimers. Complete the [User Agreement], print, sign and return it to our office for processing by mail, fax or e-mail to:
            Land & Aerial Survey Office
            InCORS Network Administrator
            120 South Shortridge Road
            Indianapolis, IN 46219-6705
            Phone: 317-610-7251, ext. 293
            Fax: 317-356-9351
            E-mail: incors@indot.in.gov
User Agreement Prior to June 19, 2013
To view a copy of the old version of the User Agreement that is no longer accepted, click here [User Agreement before June 19, 2013] . It is provided for anyone that would like to compare the current User Agreement to the old version.

Do you provide Network RTK service?
Yes, currently the InCORS is providing Network RTK in RTCM (Real Time Correction Message) 2.3, and 3.1 in the MAX (R2K2 Full) and i-MAX (R2K2 LITE) formats via NTRIP (Networked Transport of RTCM via Internet) and TCP/IP, as well as CMR and CMR+ in the MAX (R2K2 Full) and i-MAX (R2K2 LITE) formats via NTRIP, and TCP/IP. The main difference between MAX and i-MAX is the processing is done at the ROVER for MAX and with i-MAX the processing is done at the servers. In order to access these messages the user will need a wireless modem device that can access the wireless web. The modems come in all shapes and styles and through different wireless providers. INDOT does not recommend one provider over the other, the user must determine the coverage in his/her particular area to determine the best solution. The users also need to complete the RTK users agreement which is available as a link on the main page. Once the RTK users agreement is signed and returned to INDOT, INDOT will provide the IP address, port number, account username, and account password of the system to the user.

Are there any fees associated with the RTK access?
At this time INDOT does not charge any access fees for RTK corrections. INDOT provides all the data as a public service. The fees incurred with the RTK access are through the wireless providers. However in the future it may become necessary for INDOT to charge a fee to help offset some of the maintenance costs.

What if I need technical support or have questions about the network?
If the information on our website doesn’t answer your questions, we would encourage you to contact your equipment vendor prior to contacting our office. Unfortunately we do not have the staff to provide 24/7 support to all users outside of the DOT at this time. If your questions can’t be answered elsewhere, please email your inquiry to us first at incors@indot.in.gov, before attempting to call in.