Performance of "Low-Cost" GPS Receivers for Yield Mapping

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

doi:10.13031/2013.9152

Cited by 6 publications

(4 citation statements)

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“…The consumer-grade unit showed a relative positioning difference of 7.9 ft compared to the mapping-grade unit. The crop yield maps produced from each GPS unit's data showing variability and yield showed no visual differences, and management zones interpolated from the data showed 65-80% similarity between the two GPS units (Shannon et al 2002).…”

Section: Dynamic Gps Collection Methodsmentioning

confidence: 88%

Accuracy Assessment of Perimeter and Area Calculations Using Consumer-Grade Global Positioning System (GPS) Units in Southern Forests

Unger¹,

Hung²,

Parker³

et al. 2013

Southern Journal of Applied Forestry

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Field foresters have long required a method of accurate measurement of perimeter and area during forest management activities. Perimeter and area assessments that can be derived from individual waypoints collected via global positioning system (GPS) units can be an expensive endeavor. A question of concern for practicing foresters is as the cost of GPS units increase does the accuracy of waypoints and any derived perimeter and area assessments also increase? This research evaluated whether the dynamic collection of waypoints using consumer-grade GPS units ranging from $50 to $700 provide a sufficient level of accuracy for the calculation of perimeter and area under three types of canopy cover: a newly established 3-year-old pine plantation, a 13-year-old pine plantation nearing first thinning, and a 40-year-old mixed pine/hardwood stand. Perimeter and area accuracy was not related to cost indicating that inexpensive GPS units provide an accurate waypoint location when used to derive perimeter and area measurements. When compared to a professional survey of each cover type, the average perimeter root mean square error (RMSE) ranged from 18.72 ft (0.41% of total perimeter) in the 40-year-old mixed pine/hardwood stand to 108.50 ft (2.43% of total perimeter) in the 13-year-old pine plantation. The average area RMSE observed ranged from 0.07 acres (0.22% of total acreage) in the 3-year-old plantation to 1.32 acres (4.67% of total acreage) in the 13-year-old pine plantation. For many forestry applications needing a perimeter and acreage assessment, these levels of accuracy should be more than sufficient.

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Section: Dynamic Gps Collection Methodsmentioning

confidence: 88%

Accuracy Assessment of Perimeter and Area Calculations Using Consumer-Grade Global Positioning System (GPS) Units in Southern Forests

Unger¹,

Hung²,

Parker³

et al. 2013

Southern Journal of Applied Forestry

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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%

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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“…Several applications such as navigation on the sea, oceanographic research, velocity and position in small scale geophysical exploration require low accuracy; applications such as hydrography, calibration of transponder system, precise navigation and seismic survey, etc; are categorized as medium accuracy requirements; and applications which require high accuracy include precise hydrographic surveying, marine engineering, geodynamics, precise height control, and other Engineering construction projects (Sjoberg, 2012). Shannon et al, (2002) noted that as the influx of GPS receivers into the field of surveying continues to grow, there has been much debate over the accuracy and application of the many GPS receivers available. With the advent of the latest GPS receivers, there has been improved accuracy of positional information as several factors such as satellite availability, multipath, clock errors, etc., degrade the required accuracy provided by the various GPS receivers.…”

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confidence: 99%

Comparative Study of Positional Accuracies Using Three GPS Receivers

Nnamani¹,

Ijaware²

2020

jasem

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The emergence of the Global Positioning System (GPS) receiver over the years has afforded the avenue to acquire data from various geospatial locations. This paper analyses and compares the accuracy of point positions collected using three Global Positioning System (GPS) receivers— South H66/H88, Sokkia radian IS, and ProMark 3. A field study was conducted on 5 control points within the Federal University of Technology Akure (FUTA) Campus. The One-way ANOVA test performed for the coordinates obtained from the three GPS receivers at an alpha level of 0.05 using SPSS version 16 reveals no statistically significant difference between the coordinates. Analysis of the result shows that South GPS, Sokkia GPS, and ProMark GPS receivers had horizontal misclosure values of 0.1337, 0.1625 and 0.2425 respectively, making South GPS best in obtaining accurate information onhorizontal positions. For the vertical position, misclosure values of 0.0902, 0.2336, and 0.2771 respectively were obtained for the Three GPS receivers, thereby revealing that Sokkia GPS performed optimally in obtaining heights above the ellipsoid. However, as a combination of horizontal and vertical positions (3-Dimension), Sokkia GPS performed best while ProMark GPS performed averagely and South GPS performed least. This study shows that any of the three GPS receivers can provide reasonable accurate geographic data. However, a definite conclusion remains that the selection of an optimal GPS receiver in this study for any project will largely depend upon the user’s needs and project requirements as the significant variation observed in the height coordinates should be further investigated. Keywords: GPS Receivers, Accuracy, Position Determination, GPS Coordinates

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Performance of "Low-Cost" GPS Receivers for Yield Mapping

Cited by 6 publications

References 0 publications

Accuracy Assessment of Perimeter and Area Calculations Using Consumer-Grade Global Positioning System (GPS) Units in Southern Forests

Accuracy Assessment of Perimeter and Area Calculations Using Consumer-Grade Global Positioning System (GPS) Units in Southern Forests

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

Comparative Study of Positional Accuracies Using Three GPS Receivers

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