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GPS and Precision Ag Technologies Is There Anything New?

GPS and Precision Ag Technologies Is There Anything New?. Kent Shannon Associate Director Missouri Precision Agriculture Center. GPS and Precision Ag Technologies Is There Anything New?. GPS – Handheld (Low-Cost) Handheld Computers / Software GPS Guidance – Lightbars / Automatic

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GPS and Precision Ag Technologies Is There Anything New?

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  1. GPS and Precision Ag TechnologiesIs There Anything New? Kent Shannon Associate Director Missouri Precision Agriculture Center

  2. GPS and Precision Ag TechnologiesIs There Anything New? • GPS – Handheld (Low-Cost) • Handheld Computers / Software • GPS Guidance – Lightbars / Automatic • Yield Monitors • Sensors

  3. Comparison of VariousRecreational GPS Receivers • 12 different recreational GPS receivers and a common DGPS receiver used for precision ag applications • Compared to a Ashtech Z-Surveyor RTK GPS receiver with a 3-10 cm horizontal accuracy

  4. Equipment Used for Data Collection • Recreational GPS Receivers Used • Garmin – 7 models • Magellan – 2 models • Lowrance – 1 model • Teletype Compact Flash - WAAS • Navman – iPAQ sleeve - WAAS • Starlink Invicta 210 – DGPS receiver – Coast Guard Beacon

  5. Equipment Used for Data Collection • Garmin – 7 models • eTrex • Geko 201 - WAAS • eTrex Legend - WAAS • eTrex Vista - WAAS • GPS 76 - WAAS • Rino 120 - WAAS • GPS III Plus

  6. Equipment Used for Data Collection • Magellan – 2 models • Meridian GPS - WAAS • SporTrak Map - WAAS • Lowrance iFinder - WAAS

  7. Equipment Used for Data Collection GPS receivers antennas mounted 1.88 m (74 in) apart from each other Used PocketPC computers running VisualGPSce to collect raw NMEA data

  8. Location for Data Collection 205 m RTK Base Station 610 m

  9. Testing Pattern

  10. Testing Pattern – Data Used for Analysis

  11. Methodology for Data Collection • Tests consisted of four time periods, each on a different day. • Two days of testing were conducted at 19.1 km/hr (11.9 mph) for 12 minutes • Two days of testing were conducted at 13.2 km/hr (8.2 mph) for 16 minutes • Each time period receivers were tested using a Randomized Complete Block Design

  12. Results and Discussion • Relative Accuracy • 95th percentile value • Mean • Standard Deviation • Ability to acquire WAAS correction and effect on relative accuracy

  13. LSD (0.05) = 2.34 Note: Distance of 1.88 meters between GPS antennas taken into account

  14. Note: Distance of 1.88 meters between GPS antennas taken into account

  15. LSD (0.05) = 1.21 Note: Distance of 1.88 meters between GPS antennas taken into account

  16. Ability to Acquire WAAS Differential Correction

  17. LSD (0.05) = 1.21 Note: Distance of 1.88 meters between GPS antennas taken into account

  18. Conclusions • Recreational GPS receivers perform well if WAAS differential correction is acquired in a straight line trajectory. • There is some differences between recreational GPS receivers. • Further work needs to be done, i.e. contours and using external antennas.

  19. Yield Data Collectionwith “Low-Cost” GPS Receivers PC/Cigarette Lighter Combination Cable Holux GM-210 with Serial Connection and Cigarette Lighter Adapter GPS76 with a GA27C External Antenna

  20. Corn Yield Map Made With Holux GM-210 GPS and Garmin GPS76 GPS

  21. Palm/Handspring Zire, Tungsten, Treo Smartphones Sony CLIÉ Compaq/HP - iPAQ 2215 Dell Axim X5 Toshiba – e750 ASUS – A620 ViewSonic – PCV37 Zayo – A600 Handheld Computers Palm OS Pocket PC

  22. Farm TracMate SST Stratus Using Non-GPS Crop Recordkeeping Software on a PocketPC MapShots Pocket Crops

  23. Adding GPS for Crop Recordkeeping Integration of FarmWorks – TracMate and SiteMate

  24. Adding GPS for Crop Recordkeeping SST Stratus and Summit

  25. GPS Aided GuidanceLightbars

  26. GPS GuidanceAutomatic

  27. Yield Monitors and Controllers CAN Bus

  28. Aerial Photograph from June 20, 2003 used for Development of Sidedress Nitrogen Application and Zones Developed

  29. Greenness of Nitrogen Sufficient Plots Greenness Ratio = Greenness of Nitrogen Deficient Plots Nitrogen Rate = (-1249 + 1295 (Greenness Ratio)) x 0.89 Formula based on research by Scharf and Lory, Calibrating Corn Color from Aerial Photographs to Predict Sidedress Nitrogen Need Agron. J. 94:397-404 (2002)

  30. Research Data from Scharf Used to Calculate EONR From Chlorophyll Meter from June 19, 2003 In Zone 4, in-field information from a SPAD meter was used to calculate a side-dress amount of nitrogen of 150 lbs/acre

  31. LSD (0.05) = 7.76 LSD (0.05) = 10.66 LSD (0.05) = 4.60 LSD (0.05) = 8.00 LSD (0.05) = 11.12

  32. Economics of the Nitrogen Management Strategies Used $0.28/lb for Nitrogen and $2.40/bu for Corn

  33. Where are we going from here? Using the relationship of the amount of biomass to nitrogen need

  34. Any Questions?

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