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Development of an electronic system for field-scale geomorphometric measurements.

机译：用于现场规模地貌测量的电子系统的开发。

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摘要

Terrain attributes are the most studied soil characteristics. Although important, few areas have their topographic features mapped at the field-scale level. These features are vital for the management and planning of production fields. Today, terrain attributes are derived from elevation measurement.; A more direct form of measurement was developed by Rowe and Spencer (1976), pitch and roll angles were used to derive slope gradient and vehicle attitude. Yang (1997) related vehicle attitude to slope aspect. These mathematical models are difficult to implement in low-cost micro-controllers because of trigonometric functions. Research conducted at the Biosystems Department of The University of Tennessee focused on the simplification of the existing models and on the development of an electronic system to test two sensing techniques in dual-axial rotational measurement of a roving vehicle: a clinometer and an accelerometer. Tests were conducted in a topography-variable field of the Blount Experiment Research Unit. Elevation data measured with a RTK-GPS were used to generate an accurate elevation map. Terrain attributes were calculated in 3 spatial resolutions: 4, 16, and 100 m2.; The simplification of the mathematical models relating pitch and roll angles to terrain attributes is possible because of the existing limitations on slope gradient of arable lands. Results obtained during the field test show that slope measurement accuracy varied according to spatial resolutions. The density of points used in the calculation of the terrain attributes also contributes to the measurement accuracy. In general, mean absolute error (MAE) was less than 1° for both sensors in all resolutions tested. Data collected can also be used to detect field elevation changes.; In conclusion, it is possible to rely on measurements of vehicle axial rotation for the computation of field-scale terrain attributes. The sensing techniques tested were successfully used in these measurements. The application of simplified models to derive terrain measurements is possible due to the existing slope gradient limitation of arable lands. An order I map of terrain attributes is possible to be obtained using the proposed electronic system and models. The system can also be used to pinpoint locations of elevation differences in the field.
机译：地形属性是研究最多的土壤特性。尽管很重要，但很少有区域的地形特征是在野外尺度上绘制的。这些功能对于生产领域的管理和计划至关重要。今天，地形属性是从海拔测量中得出的。 Rowe和Spencer（1976）开发了一种更直接的测量形式，使用俯仰角和侧倾角得出坡度和车辆姿态。 Yang（1997）将车辆的姿态与坡度相关。由于三角函数，这些数学模型很难在低成本的微控制器中实现。田纳西州大学生物系统系进行的研究集中在简化现有模型和开发电子系统上，该系统用于测试粗纱车双轴旋转测量中的两种传感技术：倾斜仪和加速度计。在Blount实验研究部的地形可变领域中进行了测试。使用RTK-GPS测量的高程数据用于生成准确的高程图。地形属性以3种空间分辨率进行计算：4、16和100平方米。由于耕地坡度存在限制，因此可以简化将俯仰角和侧倾角与地形属性相关的数学模型。现场测试期间获得的结果表明，坡度测量精度根据空间分辨率而变化。用于计算地形属性的点的密度也有助于测量精度。通常，在所有测试分辨率下，两个传感器的平均绝对误差（MAE）均小于1°。收集的数据还可以用于检测场高变化。总之，有可能依赖于车辆轴向旋转的测量值来计算现场比例的地形属性。测试的传感技术已成功用于这些测量中。由于耕地存在现有的坡度梯度限制，因此有可能将简化模型应用于地形测量。使用提出的电子系统和模型可以获取地形属性的I阶地图。该系统还可用于在野外查明高程差的位置。

著录项

  • 作者

    Barbosa, Roberto Negrao.;

  • 作者单位

    The University of Tennessee.;

  • 授予单位 The University of Tennessee.;
  • 学科 Engineering Agricultural.; Environmental Sciences.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 183 p.
  • 总页数 183
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农业工程;环境科学基础理论;
  • 关键词

  • 入库时间 2022-08-17 11:42:17

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