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GB/T 45725-2025: Visible to short-wave infrared spectral reflectance measurement of crops
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GB/T 45725-2025: Visible to short-wave infrared spectral reflectance measurement of crops

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ICS 07.040 CCSA77 National Standard of the People's Republic of China Visible-shortwave infrared spectral reflectance measurement of crops Released on 2025-05-30 2025-12-01 Implementation State Administration for Market Regulation The National Standardization Administration issued

Table of contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Measurement conditions 2 4.1 Measurement Environment 2 4.2 Measurement staff and measurement time 2 4.3 Measuring devices and instruments 2 5 Measurement preparation 3 5.1 Measurement plan development 3 5.2 Inspection and debugging of measuring equipment 3 6 Field canopy spectral reflectance measurement 4 6.1 Measurement Process 4 6.2 Selection and layout of monitoring plots and monitoring points 4 6.3 Monitoring time and space benchmark and positioning 4 6.4 Instrument assembly and parameter setting before measurement 4 6.5 Standard reference board layout 5 6.6 Spectral Measurement Step 5 6.7 Number of measurements at monitoring points 5 6.8 Measurement Record 5 7 Leaf spectral reflectance measurement 6 7.1 Selection of measuring blades 6 7.2 Measurement methods and steps 6 8 Spectral measurement data processing 7 8.1 Measurement data quality control 7 8.2 Spectral reflectance calculation 7 9 Preparation of measurement report and handover of data files 8 Appendix A (Normative) Growth period of major crops and judgment rules 9 A.1 Wheat Growth Period 9 A.2 Corn Growth Period 9 A.3 Rice growth period10 A.4 Potato Growth Period10 A.5 Soybean Growth Period11 A.6 Cotton Growth Period11 A.7 Rapeseed Growth Period12 Appendix B (Informative) Crop Visible Light-Short Wave Infrared Spectral Reflectance Measurement Record Table 13 Appendix C (Informative) Example of filling out the record form for the measurement of crop visible light-shortwave infrared spectral reflectance 15 Appendix D (Informative) Schematic diagram of leaf clamp method and integral method for measuring leaf spectral reflectance 17 Appendix E (Informative) Example of a report outline for crop visible-shortwave infrared spectral reflectance measurement 18 References 19

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the Chinese Academy of Sciences. This document is under the jurisdiction of the National Remote Sensing Technology Standardization Technical Committee (SAC/TC327). This document was drafted by. Beijing Academy of Agricultural and Forestry Sciences Information Technology Research Center, Chinese Academy of Sciences Space Information Innovation Institute, China Agricultural University Institute of Agricultural Resources and Agricultural Zoning, Chinese Academy of Agricultural Sciences, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Chang'an University, and Henan Polytechnic University. The main drafters of this document are. Zhao Chunjiang, Yang Guijun, Long Huiling, Yang Xiaodong, Li Heli, Ma Lingling, Gao Maofang, Chen Pengfei, Li Zhenhong, Li Changchun, Song Xiaoyu, Xu Xingang, Feng Haikuan, Meng Yang, and Li Weiguo. Visible-shortwave infrared spectral reflectance measurement of crops

1 Scope

This document describes the measurement conditions, measurement preparation, and field canopy spectral reflectance of crops in the visible-shortwave infrared band. Rate measurement, blade spectral reflectance measurement, spectral measurement data processing, measurement report preparation and data file transfer. This document is applicable to the remote sensing monitoring of crops planted in the natural environment of the field, the visible light of the canopy and leaves in the spectral library construction, and the short-wave red Spectral reflectance measurement of outer bands (350nm~2500nm), visible light-shortwave infrared bands of other crop canopies, leaves, flowers and fruits Spectral reflectance measurements were performed as described above.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 33988-2017 Measurement of visible light-shortwave infrared spectral reflectance of urban objects GB/T 36540-2018 Measurement of visible light-shortwave infrared spectral reflectance of water GB/T 37804-2019 Winter wheat seedling growth monitoring specification GB/T 40834-2021 Specification for monitoring the growth of summer corn seedlings NY/T 2738.1-2015 Technical Specifications for Remote Sensing Monitoring of Crop Diseases Part 1.Wheat Stripe Rust NY/T 2738.2-2015 Technical Specifications for Remote Sensing Monitoring of Crop Diseases Part 2.Wheat Powdery Mildew NY/T 2738.3-2015 Technical Specifications for Remote Sensing Monitoring of Crop Diseases Part 3.Corn Leaf Spot and Corn Leaf Spot NY/T 4065-2021 Technical Specification for Remote Sensing Monitoring of Major Crop Yields Using Medium and High Resolution Satellites NY/T 4378-2023 General technology for agricultural remote sensing surveys Technical specifications for crop drought monitoring NY/T 4379-2023 General technology for agricultural remote sensing surveys Technical specifications for crop lodging monitoring

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Crops Various plants cultivated in agriculture. Note. Includes food crops and cash crops. 3.2 Crop canopy Above-ground organisms formed during the growth of crops that can represent field planting patterns and growth conditions. 3.3 crop leaves Leaf organs with physiological and ecological functional traits formed during the growth process of crops. ...