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GB/T 45725-2025Visible to short-wave infrared spectral reflectance measurement of crops (English PDF)

农作物可见光-短波红外光谱反射率测量

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

May 30, 2025

Implementation date

December 1, 2025

Scope

GB/T 45725-2025 is the English-translated version of 农作物可见光-短波红外光谱反射率测量.

GB/T 45725-2025 is the Chinese national standard covering measuring how a crop reflects light from 350 to 2500 nanometres — the hours and conditions that allow a reading, the instrument check, the plots and points and the white reference panel against which the canopy is ratioed, the leaf measurement by clip or integrating sphere, the growth stage each reading is tied to, the reflectance calculation and its quality control, and the report and data files handed over. First edition, under the Chinese Academy of Sciences. In force from 1 December 2025. Issued on 30 May 2025, it has been in force since 1 December 2025.

Document preview — GB/T 45725-2025

National Standard of the People's Republic of China

ICS: 07.040
Classification: A 77

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

PrefaceIII
1 Scope1
2 Normative references1
3 Terms and Definitions1
4 Measurement conditions2
4.1 Measurement Environment2
4.2 Measurement staff and measurement time2
4.3 Measuring devices and instruments2
5 Measurement preparation3
5.1 Measurement plan development3
5.2 Inspection and debugging of measuring equipment3
6 Field canopy spectral reflectance measurement4
6.1 Measurement Process4
6.2 Selection and layout of monitoring plots and monitoring points4
6.3 Monitoring time and space benchmark and positioning4
6.4 Instrument assembly and parameter setting before measurement4
6.5 Standard reference board layout5
6.6 Spectral Measurement Step5
6.7 Number of measurements at monitoring points5
6.8 Measurement Record5
7 Leaf spectral reflectance measurement6
7.1 Selection of measuring blades6
7.2 Measurement methods and steps6
8 Spectral measurement data processing7
8.1 Measurement data quality control7
8.2 Spectral reflectance calculation7
9 Preparation of measurement report and handover of data files8
Appendix A (Normative) Growth period of major crops and judgment rules9
A.1 Wheat Growth Period9
A.2 Corn Growth Period9
Appendix C (Informative) Example of filling out the record form for the measurement of crop visible light-shortwave infrared spectral reflectance15
Appendix D (Informative) Schematic diagram of leaf clamp method and integral method for measuring leaf spectral reflectance17
Appendix E (Informative) Example of a report outline for crop visible-shortwave infrared spectral reflectance measurement18
References19

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

GB/T 33988-2017

GB/T 36540-2018

GB/T 37804-2019

GB/T 40834-2021

NY/T 2738.1-2015

NY/T 2738.2-2015

NY/T 2738.3-2015

NY/T 4065-2021

NY/T 4378-2023

NY/T 4379-2023

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.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

Referenced standards

Normative references

NY/T 2738.1-2015 · NY/T 2738.2-2015 · NY/T 2738.3-2015 · NY/T 4065-2021 · NY/T 4378-2023 · NY/T 4379-2023

Editions of GB/T 45725

Edition	Title	Revision	Status
GB/T 45725-2025	Visible to short-wave infrared spectral reflectance measurement of crops	current edition	Current

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