Precision Pays

Within an hour of the first signal emanating from the new GLONASS K1 satellite on April 7, Topcon Positioning Systems (TPS) engineers were tracking the satellite’s L1 and L2 signals. TPS receivers tracked the new code division multiple access (CDMA) L3 signals the same day.

Topcon was the first major company to track the three signals from the newly launched satellite.

Source: The Russian satellite, described as the “next generation” of GLONASS satellites, was successfully launched on February 26. Ivan Di Federico, TPS chief strategy officer, said, “The satellite launch, part of the modernization of the GLONASS system, provides an additional accuracy advantage over older satellites.”

According to the Russian Ministry of Defense, the satellite’s advanced equipment will allow doubling of the precise positioning accuracy of current satellite signals.

The new satellite is in orbit approximately 11,870 miles (19,100 kilometers) above the Earth. Additional satellites are planned to be launched this year, and will provide continuous global coverage (with two to three backup satellites).

Di Federico said, “Nearly 30 years after the first launch of a GLONASS satellite, Russia is adding CDMA to the regular frequency division multiple access (FDMA). This addition sets this navigation system apart from regular GPS and other systems under development or testing.”

Topcon pioneered dual-constellation signal reception in 2000 and now “clearly illustrated the company’s technological leadership in the precise satellite positioning industry by being the first manufacturer to combine the FDMA system design of the GLONASS system with the traditional CDMA design of the U.S. GPS system,” Di Federico said.

Precision agriculture is playing a much larger role in helping potato growers become more sustainable, according to a recent story in Spudman.

Bruce Crapo, a grower of 6,000 acres of commercial potatoes and 2,000 acres of seed potatoes in Idaho, is a good example of how the average potato farmer looks at precision agriculture – he uses technology to reduce costs, increase output and improve profits.

Crapo isn’t thrilled at the cost of high-tech equipment such as GPS-guided tractors, but he knows it’s saving him money and there’s no way he can turn back now.

“There is a substantial initial cost involved,” Crapo said. “But I also know it is saving me money. What do you do? Go back to what you were doing before? That’s not an option.”

Crapo, who uses Global Positioning System (GPS) technology on all his planters and harvesters, said the latest precision ag technology has taken farming to a different level.

“It’s light years ahead of what it was when we were doing it by hand,” he said. “We’re not going to go back to not using it, but we are wincing a little at the cost.”

Precision agriculture can loosely be defined as using new technologies such as GPS, sensors, variable rate application equipment and aerial or satellite images to make farming easier and more profitable.

Simply put, precision agriculture can help farmers improve their margins by decreasing their operating costs.

Idaho farmer Robert Blair, owner of PineCreek Precision, says the biggest benefit of precision farming is that it gives producers the ability to manage their farm on a production zone basis rather than a whole field basis. This shift, he said, allows farmers to save time and money and helps them offset the rising cost of chemicals, nutrients, fuel and fertilizer.

Blair uses a wide array of precision agriculture techniques on his 1,500-acre farm and said the technology is saving him tens of thousands of dollars every year.

Read on to learn more…

At the recent Holdrege Water Conference in Nebraska, several speakers talked about how precision technology is not only conserving water but saving growers money as well, according to this Nebraska TV report.

It really is a big money-saver,” said UNL Extension Educator Chuck Burr. “Several years ago, we had some irrigators figure out how much it costs them to make a circle, or put an inch of water on 130 acres. That can range from $600 to $1200 every time they apply an inch of water to that field. So if they can reduce a couple applications, you’re talking a couple thousand dollars for every pivot.”

The cost of pumping goes down, and so do labor and gas costs.

“With the new technology, [farmers] can sit at their computers and make sure the pivot is still
working,” Burr said. “If there is a problem, then they can drive specifically to that pivot.”

The experts say, irrigation technology helps more crops grow better. “Let’s say I have a field that has two different types of soil,” said Burr, “those soil types may require more different amount of water applied during the irrigation season.”

“We’re able to vary the speed that they run,” added Thorburn, “so that we can adjust them for different soil types. Sandy soils need more water than heavier soils.”

More efficient use of land and water means a brighter tomorrow. “Apply water just when it’s needed,” Thorburn said, “the better we are able to conserve that resource for the future.”

Click on the camera icon at this link to view the video.

Learn more about how AGCO’s AgCommand telemetry product can help you track, monitor and management all machinery in the field. Watch this video posted recently by Farm Industry News.

Steve Tupa of AGCO talks about an advanced version of AGCO’s recently introduced telemetry product called AgCommand. This product provides 25 different messages from fuel use to engine load which can be sent to home computer for observation. It was introduced at Ag Connect Expo, held recently in Atlanta, GA.

Telemetry systems like AgCommand allow navigation, prescription application, location and other data to be transferred easily to and from farm machinery. These systems will grow in importance as farmers seek ways to improve efficiencies on high-priced equipment.

If tree lines or other obstacles sometimes cause dropped signals, you may benefit from the Russian global navigation satellite system (GLONASS) that Ag Leader’s ParaDyme automated steering system will now support.

“The main advantage GLONASS capability will offer ParaDyme users is longer run-time without losing signal due to coverage interruptions or low GPS satellite availability,” says GPS and Guidance Product Manager, Matt Leinen. “This feature will be especially beneficial to our growers that often lose satellite signal due to tree lines or other field obstacles; additional satellite availability will help them maintain a GNSS signal and keep running.”

GLONASS support is the latest functionality added to the ParaDyme automated steering system. The ParaDyme can be controlled through Ag Leader’s EDGE or INTEGRA display, and features remote service and the ability to receive RTK differential correction signals via cellular network. The ParaDyme automated steering system benefits include sub-inch accuracy, increased fuel efficiency, reduced operator fatigue and more.

Don’t miss the upcoming February 9-10 NeATA conference in Grand Island, Neb., as it promises a technology extravaganza, along with other valuable topics such as precision Nitrogen management, social media, building consumer trust and much more.

The Nebraska Agricultural Technologies Association (NeATA), founded in 2001 by innovative Nebraska farmers, ranchers, agribusiness representatives and the University of Nebraska Extension, has compiled another great conference.

Need a technology makeover? How about using Nitrogen more wisely? Do you want to learn how to tell your story and share your values with consumers? How about learning a better way to select crop genetics? Check out the upcoming program, and book your trip now.

For Facebook users, find NeATA here and add them as a favorite.

This past week, I caught up with Matt Darr, Iowa State University ag engineer and precision farming guru, to chat with him about this past year in precision agriculture.

“We’ve said for a few years now that ‘accuracy is addictive.’ Well farmers are proving that as this has been a year driven by higher precision—a move to more RTK accuracy.”

The big deal. Darr cited the widespread nature of expanding RTK networks, both public and privately owned. “These networks are pushing us towards RTK becoming a standard commodity, which will help drive down the costs and give more growers the potential to achieve high-end accuracy. And that is a big deal.”

The CORS network has had a strong run over the past three years. Indiana is now online as the most recent, along with CORS networks in Iowa, Ohio, Michigan, Wisconsin, Minnesota and Missouri. “I see this growth slowing down, but we’ll continue to see greater stabilization and improvement in the signals,” Darr says.

In the private sector, we’re seeing greater expansion from Trimble’s VRS network and from John Deere’s StarFire 450 MHz radio system, as well as other smaller companies building systems across the Midwest.

Crop sensing. Another big push is on to figure out how to use active crop sensing to provide financial benefit. “With the addition of Ag Leader’s OptRx system, along with the Greenseeker from Trimble and CropSpec from Topcon, growers have the potential to unlock another area of profitability. It’s not as simple as auto guidance, and it may not work for everyone,” Darr says.

This technology offers a natural fit in wheat, since growers are used to topdressing in the spring. “Anytime you can automate N applications, you’re looking at both economic and environmental benefits. A reduction in the over-application of N is a big deal,” Darr says.

“The challenge for Midwest corn growers is that not every producer uses sidedressed N when corn is 12 to 18 inches tall, which is where this technology needs to be used. So you’re asking growers to change production practices as well as adopt new technology, so these challenges will slow adoption. But it offers huge potential,” he adds.

The future. “If you look back 4 or 5 years, and think about the automation technology that has come out—from auto swath to auto steer—all the easy things, relatively speaking, have been automated. Future automation gets tougher. We now need to circle back to data and press that information into greater knowledge. That’s what we’re after. We must gain knowledge from all this data to improve our operations,” he says.

GPS World offers a look at their top five events in GPS/GNSS for 2010, so check it out, too. http://www.gpsworld.com/survey/top-5-events-gpsgnss-2010-a-year-end-review-10854

Visit these links for more information.

CORS Network
http://www.ngs.noaa.gov/CORS/GoogleMap/CORS.shtml

Learn How CORS Network Can Fit Precision Farming
http://precisionpays.com/2010/01/learn-how-cors-network-can-fit-precision-farming/

Lessons in Differential Correction
http://www.agleader.com/2010/07/02/lessons-in-precision-ag-differential-correction-part-2/

RTK Network Options
http://farmindustrynews.com/precision-guidance/rtk-network-options

Ag Leader dealer locator
http://www.agleader.com/dealer-search/

Check out a good story by Farm Industry News that offers the latest look at RTK signal correction across the Midwest.

The umbrella of real-time kinematic (RTK) correction signals that covers much of the Corn Belt will be larger and more robust by the time the 2011 planting season rolls around. As a result, growers in many geographies will have multiple correction signal options for driving RTK navigation systems.

Going into 2010, most of the heart of the Corn Belt was covered by either radio or cellular systems, or both. But there were coverage gaps. By 2011, a coverage gap in Illinois will have been plugged, and coverage in Ohio, Indiana, South Dakota, Nebraska, Kansas, Missouri and other states will have been beefed up.

The improved coverage is a result of build-outs of both traditional radio-based systems and newer cellular delivery systems, which distribute RTK corrections via the Internet through cellular communications networks. Unlike in recent years, when additions to the cellular delivery system were dominated by new and expanding state department of transportation (DOT) systems, this season’s new cellular entries are systems dedicated to agricultural users.

Read on…

GPS/GNSS drift, or how accurate your guidance system is over time, is explained in a new piece on www.AlabamaPrecisionAgOnline.com.

The Alabama Precision Agriculture Team discovered that some users of GPS/GNSS-based technologies were not optimizing the GPS/GNSS correction services for their particular field operations (e.g. using the WAAS correction service for planting). It is imperative to understand the different accuracies associated with GPS/GNSS correction services so one can maximize benefits of their precision ag technologies.

GPS/GNSS Drift
Upon returning to the field, a producer may notice discrepancy between what he/she knows to be the crop row where an AB line was previously established, and where the guidance device is suggesting the AB line is located. WAAS and sub-meter correction services may seem accurate during one field operation but be off-track when the operator returns to the field. This result is because there is typically large ambiguity between pass-to-pass accuracy and year-to-year accuracy or GPS drift.

 GPS/GNSS Drift / Year-To-Year Accuracy (Y2Y) / Long-term Accuracy: Drift can be defined as GPS/GNSS receiver (guidance system) accuracy over time. Causes of drift are changes in satellite configuration, operating near trees or other obstacles, and satellite data errors.

 Pass-to-Pass Accuracy (P2P): Represents the short-term (<15 min.) relative accuracy of a GPS/GNSS receiver but does not necessarily reflect long-term accuracy (which includes drift). One can think of this as the accuracy between adjacent, parallel passes made within 15 minutes of one another.

Since manufacturers typically report pass-to-pass accuracy, it is generally used for equipment purchasing decisions. However, this accuracy may not reveal how the guidance or GPS/GNSS-based system will perform relative to the last operation or over the course of time if previously established AB lines are re-used. This result is especially true when AB lines are established for planting and re-used for harvesting.

As mentioned above, GPS/GNSS drift is largely due to the changing GPS/GNSS satellite constellation patterns used by the guidance device to derive positional information. GPS/GNSS satellites are in continuous motion orbiting the earth twice per day in a repeated pattern. It is assumed that the GPS/GNSS satellite constellation and environmental conditions will not drastically change within a given 15 minute time span, thus derived positions using the same satellite constellation and environmental conditions will be closely correlated relative to each other. However, the GPS/GNSS satellite constellation and atmospheric conditions change over just short time periods resulting in different satellites in varying geometric configurations. Therefore, the magnitude of drift expressed by your device is dependent on the correction service used. Using WAAS, potential range of drift is plus or minus 4.7 feet. With sub-meter accuracy, it’s 2.3 ft.; with decimeter it’s 1.7 ft.; and with RTK it’s 1 inch.

Read on to learn solutions…

If you’re just starting to look at more advanced precision agriculture practices on your farm such as auto steer, take a look at your operation to see which signal is right for you. Jonathan Hall, a grad assistant at Auburn University, offers some tips on the Precision Ag Blog.

After exploring all of the equipment that can be purchased, you will find that there are three basic options for GPS accuracy:

1. A free signal, known as Wide Area Augmentation System (WAAS), provides pass-to-pass accuracy of about ±6 to 13 inches and has a potential GPS drift of ±4 to ±7 ft. WAAS is managed by the Federal Aviation Administration (FAA).

2. A “corrected” signal that requires a paid subscription can provide a pass-to-pass accuracy between ±2 and ±13 inches and has a potential GPS drift of ±1.7 to ±3 ft depending on the correction service.

3. A real-time kinematic (RTK) system that provides pass-to-pass accuracy of ±1 inch and a potential GPS drift of ±1 inch. This system requires the purchase of an RTK base station if an RTK network, such as CORS, does not already exist in your area. The Continually Operation Reference Station (CORS) network is a free RTK signal operated and monitored by the National Geodetic Survey (NGS). If CORS is not available in your area an annual subscription for a proprietary RTK network can be purchased.

It is important to keep in mind two terms relating to GPS/GNSS accuracy when evaluating signal options. Pass-to-pass accuracy is the accuracy of the GPS/GNSS receiver over a 15 minute time-frame and pertains to short-term operations such as spraying or fertilizing fields. GPS drift is the accuracy of the GPS/GNSS receiver over an extended period of time. GPS drift is more long-term and becomes important when planting or harvesting.

Check out his piece to learn more.

Precision steering, whether assisted technology attached to the steering wheel or fully automated steering wired into hydraulics, can give you improved pass-to-pass accuracy, time and money savings, and less operator fatigue.

I spoke the other day with Jeff Bentley, Ag Leader Technology’s sales manager for GPS Guidance and Steering, to get his take on the usefulness of non-human steering in the fall.

He told me there are three major areas that auto steer technology can benefit a farmer in the fall—combining, field tillage and fall fertilization. And you don’t necessarily need the higher cost RTK differential correction signal.

OnTrac

“In the combine, either our OnTrac2 assisted steering system or our advanced ParaDyme automated steering will benefit anyone with a platform head to keep it completely full of soybeans or wheat during harvest,” Bentley says. “We have some customers who also use RTK to guide a corn head down rows that were planted using RTK auto steer.”

ParaDyme

When it comes to fall tillage, many growers have done some on-farm testing with automated steering. “The results growers tend to see when comparing manual steering to auto steering usually range from three percent up to 10 percent greater efficiency. And you can use a wide range of signals, from the free WAAS signal to OmniSTAR to RTK.”

The third fall application that benefits from auto steer is fertilization. “Growers use it when applying anhydrous, when using a spinner-spreader and especially when applying fertilizer as part of a strip-till operation, using RTK so they can come back and plant exactly over the top next spring,” Bentley says.

To control these systems, Bentley says the OnTrac2 uses the EDGE display. For the ParaDyme, you can use either the EDGE or the INTEGRA display. “And with either display you can add DirectCommand for section control and rate control for anhydrous bars and strip-till air carts.”

Bentley says if you haven’t invested in steering technology yet, its year-around uses will deliver greater efficiency, fuel savings, input savings, time savings and especially less operator fatigue.

Visit these links for more information.

ParaDyme and OnTrac2 http://www.agleader.com/products/steering/

INTEGRA http://www.agleader.com/products/integra/

EDGE http://www.agleader.com/products/edge/

A European Space Agency (ESA) project , TalkingFields, aims to takes satellite observations of fields and provide actionable advice to farmers throughout the growing season.

The TalkingFields initiative is now showing how to combine satellite observation with satellite navigation to benefit European farmers.
Sustainable food production and food security are critical challenges. TalkingFields will help by using precision farming methods to produce crops more efficiently. For instance, by optimising farmers’ use of fertiliser and giving early warning of plant disease risks, both costs and environmental impacts can be reduced.

“There are existing services variously employing Earth observation data, satellite navigation, farm management software and crop growth models, but TalkingFields is the first to combine them all,” said ESA’s Tony Sephton.

“We’re setting up an end-to-end service that is simple to use and sufficiently cost-effective to be self-sustaining.”

How does it work? The farmer requests the service for an area defined using satnav. Satellites gather information on the land’s potential – observations over several years can reveal variations in crop growth through soil changes – as well as current crop status.

These results are combined with information from field sensors such as weather conditions and soil moisture. The farmer adds in his own knowledge, and in return receives detailed satnav instructions on where and how much fertiliser to spray, for example.

A variety of satellites can be employed, although priority will be given to free data sources such as Landsat and ESA’s forthcoming Sentinel-2 satellites, due for launch in 2012.

“Ideally, we might have weekly satellite acquisitions, but cloud cover makes that unfeasible,” explained Dr Sephton.

“Instead, we need only two to four satellite images per growing season, which are fed into a sophisticated crop growth model.

“With TalkingFields the emphasis is on service: we’re not giving raw satellite data straight to farmers. Instead, we advise them directly on actions to be taken throughout the growing season.”

Read more

More equipment companies involved in precision agriculture are deploying remote diagnostic capabilities as part of a broader telematic system offering.

Farm Industry News offers a fascinating look at some of the current technology.

After being on the agriculture market for almost a decade, telematic systems that once were thought to be useful mostly to large farming and custom application operations with far-flung equipment fleets are beginning to offer features that smaller operations may find attractive as well.

The newest systems offer remote diagnostics of power equipment, real-time combine monitoring and on-the-go transfer of prescription application, as-applied and yield maps. GPS-based features like current location, field and transport speeds, and idling versus working time also are becoming more sophisticated.

Read the rest of the story.

Trimble recently introduced its latest in-cab, touch screen CFX-750 display. The 8-inch, full-color display allows farmers to choose the specific guidance, steering and precision agriculture capabilities that best fit their farm’s particular needs. The farmer can upgrade the CFX-750 display as business needs change, including adding GLONASS capabilities, or adding section and rate control for crop inputs such as seed, chemicals and fertilizer.

When the built-in, dual-frequency receiver is upgraded to GLONASS, it provides the option to nearly double the number of available satellites from which to receive satellite signals.

For precision planting operations, the CFX-750 display is compatible with Trimble’s Field-IQ crop input control system and Tru Count clutches and can perform section control on up to 48 sections. Add rate control with the Field-IQ system to save costs and increase yields while also keeping records of what was applied. Additionally, operators can increase visibility from the cab by using the two live video feeds on the CFX-750 display to view the implement being pulled behind the vehicle.

“The Trimble CFX-750 display features the industry-leading Trimble Maxwell 6 chip that tracks up to 44 satellites simultaneously including GLONASS,” said Erik Arvesen, vice president and general manager for Trimble’s Agriculture Division. “This is a great high-performance, entry-level platform that can be upgraded to the Field-IQ section and rate control system as the farmer’s needs grow.”

The CFX-750 display is affordably priced starting at US$2,995 MSRP and is expected to be available in September 2010. Contact a local Trimble dealer at www.trimble.com/locator for more information.

German company RapidEye, the only geospatial solutions provider to own and operate a constellation of five identical Earth Observation satellites, announced today that over a period of just three months, 95% of the contiguous United States has been imaged. Almost 80% of this imagery was captured by the RapidEye satellites with less than ten percent cloud cover.

The campaign, which began May 1 and was completed on July 31, produced an abundance of imagery with many areas covered multiple times. Not only the United States was covered; 97% of Mexico was collected and almost 60% of Canada. Many areas were imaged more than once over this three month span and totaled 17 Million square kilometers of North America. All of this imagery is currently available for purchase in the RapidEye Library.

The company also has released a success story with the French precision farming company S2Bvisio about how RapidEye has delivered nitrogen fertilization maps for canola and wheat fields for the customer. You will find details about this project at http://www.rapideye.de/upload/documents/References/Customer_Reference_S2B_08_06_2009_ENG.pdf.

RapidEye images the Earth in unparalleled quantities and will continue to make its satellite imagery available through its Library, which can be searched either through a local distributor or directly through its Customer Service department. To find a distributor visit the RapidEye website at www.rapideye.de/distributors. Additionally, a selection of RapidEye products can be searched for, purchased and immediately downloaded through the RapidEye Geodata Kiosk at www.geodatakiosk.com.