Soil moisture, also referred to as soil water content, is a crucial geophysical state variable in various fields, including agriculture, hydrology, meteorology, and remote sensing calibration/validation (cal/val). Therefore, accurate measurements of in situ soil moisture are essential to ensure the improved modeling of geophysical processes, perform cal/val, and apply them in decision-making for societal benefits. There are many ways to measure soil moisture, though the gravimetric method of soil moisture measurement is the most accurate, however, it is not suitable for real-time or large-scale field studies due to labor- and time-intensive procedures. In other words, the gravimetric method-based soil moisture measurements are not very feasible for hydrological or agricultural applications where a large number of in-situ observations are needed frequently as well as for validation of the remote sensing-based products that require sampling in a narrow time window during satellite passes. Hence, alternative modern methods like electronic sensors that measure soil moisture instantly are necessary for such applications. Since soil moisture sensors usually operate on the principle of dielectric characterization of the soil and water and use conversion relationships to provide soil moisture, these sensors require appropriate calibration for precise measurements. Although various procedures for calibrating dielectric soil moisture sensors are available in the scientific literature, factors affecting calibration, the technical complexity of calibration, and lack of confidence in their effectiveness limits their use in field studies. In this context, a review of soil moisture sensor calibration protocols has been conducted with the aim of examining the effectiveness and limitations of various calibration methods and approaches for dielectric permittivity-based soil moisture sensors. The importance of selecting an appropriate calibration method based on the sensor type, soil type, and environmental conditions is highlighted in this review. We also examine various calibration methods, including traditional equations based on linear or polynomial regression and advanced methods such as the nonlinear approach (i.e., artificial neural network). The need for regular calibration and maintenance of soil moisture sensors to ensure accurate and reliable data is also emphasized. The review concludes by providing recommendations for selecting the appropriate calibration method/approach for dielectric soil moisture sensors to achieve the required accuracy and future directions. Overall, this review provides valuable insights for researchers and practitioners in the field of dielectric sensor-based soil moisture monitoring and management.
介电土壤湿度传感器校准的进展：方法和技术的全面回顾,Computers and Electronics in Agriculture 土壤湿度传感器数据范围在4000多正常吗
Advancements in dielectric soil moisture sensor Calibration: A comprehensive review of methods and techniques
版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容， 请发送邮件至lizi9903@foxmail.com举报，一经查实，本站将立刻删除。