Can A $300 GPS Receiver Be Used for Yield Mapping?

Shannon, Kent; Brumett, John; Ellis, C.; Hoette, Gary

doi:10.13031/2013.7358

Cited by 4 publications

(3 citation statements)

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“…Even some companies produce GPS-based speed sensors just to measure ground speed and to replace radar-based sensors. In another aspect, the most vital factor in the adoption and use of precision agriculture is the cost of high technology equipment (Shannon et al 2001(Shannon et al , 2002Keskin et al 2009). A GNSS receiver is one of the most essential tools with high initial costs.…”

Section: Resultsmentioning

confidence: 99%

“…The ground speed is needed to monitor and map crop yield and properly change the application rate of agricultural inputs such as seeds, pesticides and fertilizers in precision agriculture (Shannon et al 2001;Vishwanathan et al 2005;Mullenix et al 2010). Ground speed is also used in the evaluation of wheel slip and traction efficiency of agricultural tractors (Richardson et al 1982;Khalilian et al 1989;Zhixiong et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Performance of two low-cost GPS receivers for ground speed measurement under varying speed conditions

2016

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A global positioning system (GPS) receiver is an important sensor used in modern farming, particularly in precision agriculture to determine geographic location and ground speed. The aim of this study was to investigate the effectiveness of two low-cost GPS receivers for measuring ground speed under varying speed conditions on four different dates. A rotary shaft encoder on an auxiliary wheel mounted on an agricultural tractor was used as a reference. A significant time lag between the rotary encoder speed and the GPS speed was found over a range of speeds. It was observed that the GPS speed lagged the encoder speed in both increasing and decreasing speeds. The average time lag was found to be between 3.6 and 5.2 s for Receiver 1 while Receiver 2 had a time lag from 1.7 to 2.5 s. A significant difference was found between the two receivers for increasing and decreasing speeds in terms of time lags (P \ 0.05). A post correction by shifting the GPS speed increased the accuracy of the speed measurement capability of both receivers resulting in an average correlation coefficient of 0.30-0.90 for Receiver 1 and 0.65-0.98 for Receiver 2. Effect of USB-to-COM converter was also studied and it did not have a significant effect on time delay. The GPS receivers provided reliable data during constant speed operating conditions; however, caution should be exercised in varying speed conditions when using low-cost GPS receivers. Also, the companies that produce GPS-based speed sensors should supply technical specifications related to velocity estimates during acceleration and deceleration.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of two low-cost GPS receivers for ground speed measurement under varying speed conditions

2016

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“…Measurement of ground speed is necessary for many agricultural machinery applications. The ground speed is needed to monitor and map crop yield and properly change the application rate of agricultural inputs such as pesticides and fertilizers in precision agriculture [19,20,21,22].…”

Section: Introductionmentioning

confidence: 99%

Review of Fuel Consumption, Draft Force and Ground Speed Measurements of the Agricultural Tractor during Tillage Operations

Mamkagh

2019

AJARR

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Estimating the amount of fuel consumption of an agricultural tractor during various tillage operations will help the selection of the best conservation practices for farm equipment. Draft requirements often dictate the size of the power unit required on a particular farm and, therefore, will also be required for energy management decisions. They will also be considered a prominent factor during the selection of a tractor’s machinery and power source. In addition, ground speed measurement is not only necessary for many agricultural machinery applications but also to monitor and map crop yield and properly change the application rate of agricultural inputs. There are several methods and techniques to measure a tractor’s fuel consumption, draft force, and ground speed. All these methods have many advantages and disadvantages depending on the tractor, the implement used, and the operating conditions. This article reviews some of these methods, providing scope for further research to focus on the potential development and improvement of the measurement methods, and this could positively affect the accuracy of the data and final results of the research.

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Fuzzy logic to classify date palm trees based on some physical properties related to precision agriculture

2009

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Precision agriculture can be cost effective for date palm groves because the tree positions are known and fixed, the groves are mostly structured and many of agricultural operations are applied manually. Therefore, the new technology tools of precision agriculture are not essential. This study was done to improve date palm yield using maps of the variation in tree properties. Data on five Mozafati tree properties, such as sex, age, yield, visual appearance and fruit length were measured and recorded for each tree in five groves near the city of Bam in Iran. Tree positions were defined and the above properties were mapped. It was difficult to judge patterns in the variation because of tree to tree variability. Therefore, the Mamdani fuzzy inference system (MFIS) was used to classify the productive trees based on yield, fruit length and visual appearance, and to produce a tree total quality map (TTQM) for each grove. Based on the TTQM the trees were graded as excellent, good, medium, poor and very poor. The trees were also graded by the date growers who were experts. The evaluation for all groves by MFIS showed 87% general agreement with the results from the human expert indicating that it is a feasible method for classifying date palms based on quality. The results indicted that there are young and old trees in these groves that need different treatments, such as the amount of fertilizer required. Some date growers have low incomes, therefore, the overall TTQM is suitable for them because they can identify which trees have the greatest needs and apply limited resources to only those. This case study illustrates the use of computer and mathematical software to enhance date palm production and reduce the costs.

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Can A $300 GPS Receiver Be Used for Yield Mapping?

Cited by 4 publications

References 0 publications

Performance of two low-cost GPS receivers for ground speed measurement under varying speed conditions

Performance of two low-cost GPS receivers for ground speed measurement under varying speed conditions

Review of Fuel Consumption, Draft Force and Ground Speed Measurements of the Agricultural Tractor during Tillage Operations

Fuzzy logic to classify date palm trees based on some physical properties related to precision agriculture

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