### 抄録

Measuring the area of combine-harvested field sections corresponding to a truckload of grain received at a grain elevator (LHA: load harvest area) allows the estimation of brown rice yield. The objective of this study was to evaluate the accuracy of LHA measured based on combine movement traces when the traces were recorded by a GPS or a GPS + Quasi-Zenith Satellite System (QZSS) receiver. For the measurements using a GPS receiver, the mean and standard deviation of relative errors of LHA were 4.7% and 8.1%. The center of the relative error distribution shifted toward positive because positioning errors of a GPS receiver shifted outer edges of harvested sections outward and resulted in measuring larger harvested area than a true value. For the measurements using a GPS + QZSS receiver, the mean and standard deviation of relative errors of LHA were 0.5% and 4.8%. The center of the relative error distribution was around 0% for its better positioning accuracy. The relative errors of LHA tended to be large when an LHA was measured from a field section where only the outer-part of a field is harvested or several small harvested sections. These cases of LHA measurements increased the sum of the perimeter of harvested sections and resulted in deteriorating the measurement accuracy. This result indicated that measurement accuracy of LHA can be further improved by correcting error, which can be estimated based on positioning errors and the perimeter of harvested sections.

元の言語 | 英語 |
---|---|

ページ（範囲） | 272-281 |

ページ数 | 10 |

ジャーナル | Engineering in Agriculture, Environment and Food |

巻 | 10 |

発行部数 | 4 |

DOI | |

出版物ステータス | 出版済み - 10 1 2017 |

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### All Science Journal Classification (ASJC) codes

- Food Science
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering

### これを引用

*Engineering in Agriculture, Environment and Food*,

*10*(4), 272-281. https://doi.org/10.1016/j.eaef.2017.05.001

**Measurement accuracy of the area of combine-harvested field sections corresponding to a truckload of grain received at a grain elevator.** / Yasumaru, Hirai; Tanaka, K.; Nakanishi, T.; Shikanai, T.; Inoue, Eiji; Okayasu, Takashi; Muneshi, Mitsuoka.

研究成果: ジャーナルへの寄稿 › 記事

*Engineering in Agriculture, Environment and Food*, 巻. 10, 番号 4, pp. 272-281. https://doi.org/10.1016/j.eaef.2017.05.001

}

TY - JOUR

T1 - Measurement accuracy of the area of combine-harvested field sections corresponding to a truckload of grain received at a grain elevator

AU - Yasumaru, Hirai

AU - Tanaka, K.

AU - Nakanishi, T.

AU - Shikanai, T.

AU - Inoue, Eiji

AU - Okayasu, Takashi

AU - Muneshi, Mitsuoka

PY - 2017/10/1

Y1 - 2017/10/1

N2 - Measuring the area of combine-harvested field sections corresponding to a truckload of grain received at a grain elevator (LHA: load harvest area) allows the estimation of brown rice yield. The objective of this study was to evaluate the accuracy of LHA measured based on combine movement traces when the traces were recorded by a GPS or a GPS + Quasi-Zenith Satellite System (QZSS) receiver. For the measurements using a GPS receiver, the mean and standard deviation of relative errors of LHA were 4.7% and 8.1%. The center of the relative error distribution shifted toward positive because positioning errors of a GPS receiver shifted outer edges of harvested sections outward and resulted in measuring larger harvested area than a true value. For the measurements using a GPS + QZSS receiver, the mean and standard deviation of relative errors of LHA were 0.5% and 4.8%. The center of the relative error distribution was around 0% for its better positioning accuracy. The relative errors of LHA tended to be large when an LHA was measured from a field section where only the outer-part of a field is harvested or several small harvested sections. These cases of LHA measurements increased the sum of the perimeter of harvested sections and resulted in deteriorating the measurement accuracy. This result indicated that measurement accuracy of LHA can be further improved by correcting error, which can be estimated based on positioning errors and the perimeter of harvested sections.

AB - Measuring the area of combine-harvested field sections corresponding to a truckload of grain received at a grain elevator (LHA: load harvest area) allows the estimation of brown rice yield. The objective of this study was to evaluate the accuracy of LHA measured based on combine movement traces when the traces were recorded by a GPS or a GPS + Quasi-Zenith Satellite System (QZSS) receiver. For the measurements using a GPS receiver, the mean and standard deviation of relative errors of LHA were 4.7% and 8.1%. The center of the relative error distribution shifted toward positive because positioning errors of a GPS receiver shifted outer edges of harvested sections outward and resulted in measuring larger harvested area than a true value. For the measurements using a GPS + QZSS receiver, the mean and standard deviation of relative errors of LHA were 0.5% and 4.8%. The center of the relative error distribution was around 0% for its better positioning accuracy. The relative errors of LHA tended to be large when an LHA was measured from a field section where only the outer-part of a field is harvested or several small harvested sections. These cases of LHA measurements increased the sum of the perimeter of harvested sections and resulted in deteriorating the measurement accuracy. This result indicated that measurement accuracy of LHA can be further improved by correcting error, which can be estimated based on positioning errors and the perimeter of harvested sections.

UR - http://www.scopus.com/inward/record.url?scp=85019582739&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85019582739&partnerID=8YFLogxK

U2 - 10.1016/j.eaef.2017.05.001

DO - 10.1016/j.eaef.2017.05.001

M3 - Article

AN - SCOPUS:85019582739

VL - 10

SP - 272

EP - 281

JO - Engineering in Agriculture, Environment and Food

JF - Engineering in Agriculture, Environment and Food

SN - 1881-8366

IS - 4

ER -