Error Analysis on Different Yield Monitors
L.A.A. Menegatti and Molin, Jayasinghe A.P. · World Congress of Computers in Agriculture and Natural Resources, Proceedings of the 2002 Conference · 2013
Several studies have been discussing problems related to the quality of yield datainformation that comes from yield monitors. Errors re usually caused by GPS, yieldsensor, calibration, moisture sensor, errors related to the combine dynamics anderrors related to the measured area. This paper deals with raw data from differentyield monitors. Each file was studied, identifying the possible errors. Once theywere identified, the errors were classified and characterized. Yield monitorsavailable in the market generate data that may be submitted to a filtering process toimprove the quality of information. Fill time error was found in all beginnings anends of rows. Its characteristic is a slow increase on yield measured as the combine isbeing filled up. Lag time error is a systematic displacement of the yield points leadby wrong time delay in the yield monitor and was found in all data. Wronginterpretation of the cutting width when using partial header results in error onmeasured area and incorrect yield. The header cut off error happens when thecombine is not harvesting but area is being added because the system was not shutoff. Failures on collecting data was found in several situations, when the monitorshould be recording. Bad yield sensor calibration is a systematic error evidenced bya difference between monitor and the total weighed yield. Some errors occurred onspecific monitors while others are present in all files. Filters are being proposed withspecific routines for each equipment to eliminate errors.