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Continuously Operating Reference Station (CORS)
A CORS is a static, survey-grade GPS receiver which is permanently positioned at a known geographic location and collects data 24 hours a day, seven days a week. Coordinated by the National Geodetic Survey (NGS) of the National Oceanic and Atmospheric Administration (NOAA), CORS sites provide Global Navigation Satellite System (GNSS) measurements in support of 3-dimensional positioning activities. CORS data can be used for Real-Time Kinematic (RTK) applications, meaning that the station provides continuous correction data to roving GPS receivers with internet accessible capabilities. The benefit of a CORS site or network is the ability to provide accurate, repeatable position data free of charge permitting users to return to the exact same locations over time. Data collected from CORS sites has a wide array of uses. For example, CORS data can be used for monitoring coastal subsidence, surveying, determining the amount of precipitable water vapor in the atmosphere, recording and locating utility lines, and machine guidance for construction and precision agriculture. Users include local, state, and federal government, transportation, construction, emergency management, homeland security, surveyors, education, natural resource, and agriculture.
Alabama CORS Map click here
Florida PRN Map click here (Click "Site Overview" to view map)
Trimble CenterPoint VRS Coverage click here
Publications
- Application of CORS in Agriculture
- Explanation of GPS/GNSS Drift
- GPS Correction Services for Alabama
- GPS/GNSS Related Terminology
- Telematics for Ag Applications (Fall 2012)
- RTK Networks - Cellular Modem Communication Technology
- RTK Networks - Single Baseline and Network Solution Options
- RTK Networks - Real-Time Data Correction Protocols
Presentations
- Basics of GPS/GNSS Equipment and Accuracy
- Continuously Operating Reference Stations (CORS)
- Getting Started with Precision Agriculture
- GPS: Accuracy and Repeatability in Ag
- GPS/GIS Applications for Farming Systems
Blog Articles 
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OPEN POSITION: Master of Science Degree at Auburn University in Machinery Automation / Precision Ag (Fall 2013)
The Biosystems Engineering Department at Auburn University has a research assistantship, at the Master of Science (MS) level, available in the area of machinery automation focused on enhancement of agricultural equipment for site-specific management. The... more
2013 Summer Internship with Alabama Precision Ag
The Alabama Precision Ag Team is looking for an energetic young student to fill an open 2013 summer internship. The internship would include supporting research and education activities in the area of precision agriculture. Responsibilities... more
Regional Extension Agent Position in SW Alabama
The Alabama Cooperative Extension System (ACES) has just announced an OPEN POSITION Agronomic Crops extension position in southwest Alabama. The qualified person will provide research-based information and learning opportunities to agricultural row crop producers in... more
OPEN POSITION: Regional Extension Agent of Agronomic Crops – SW Alabama
The Alabama Cooperative Extension System (ACES) has announced an opening for an Regional Extension Agent (REA) position in Southwest Alabama focused on Agronomic Crops. The Extension program for a successful candidate will include emphasis in... more
Grower benefits of Automatic Section Control
Automatic section control (ASC) or sometimes termed “auto-swath” continues to be heavily adopted by US growers. The main benefit the technology has provided has been savings on inputs. Sprayer and planter manufacturers have almost made... more
