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GB/T 40034-2021Validation of leaf area index remote sensing products (English PDF)

叶面积指数遥感产品真实性检验

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

April 30, 2021

Implementation date

November 1, 2021

Scope

GB/T 40034-2021 is the English-translated version of 叶面积指数遥感产品真实性检验.

GB/T 40034-2021 explains how to check the accuracy of leaf area index products derived from remote sensing data. It builds on the general rules of GB/T 36296-2018 and GB/T 39468-2020 and defines the terms involved, such as effective leaf area index, clumping index, elementary sampling unit and wireless sensor networks.

It sets basic requirements on the timing between reference data and the product under test, then describes a direct method based on ground sampling and indirect methods: a multi-scale approach through high-resolution imagery and cross-checking against products of known accuracy.

It also fixes the content of the validation report, and its annexes cover stratified sampling, ground measurement of leaf area index, forest parameters, spatial representativeness and accuracy indices. It was issued on 30 April 2021 and has applied since 1 November 2021.

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Document preview — GB/T 40034-2021

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

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Basic requirements
5 Inspection method
5.1 Inspection method selection
5.2 Direct inspection method
5.2.1 Ground sampling method
5.2.2 Inspection process
5.3 Indirect inspection method
5.3.1 Multi-scale step-by-step inspection method based on ground measurement and high-resolution remote sensing data
5.3.2 Cross-checking method based on remote sensing products with known quality precision leaf area index
6 Inspection report
6.1 Cover information
6.2 Body information
6.2.1 Overview of remote sensing products for leaf area index to be inspected
6.2.2 Reference object description
6.2.3 Inspection methods and procedures
6.2.4 Conclusion of authenticity inspection
6.2.5 Additional information
6.3 Summary of inspection report information
Appendix A (informative appendix) Stratified sampling method
Appendix B (informative appendix) Ground measurement method of leaf area index
Appendix C (informative appendix) Forest parameter measurement methods
Appendix D (informative appendix) Spatial representativeness evaluation method
Appendix E (Informative Appendix) Accuracy Evaluation Index and Calculation Method
Reference

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the basic requirements, inspection methods and inspection report format for the authenticity inspection of leaf area index remote sensing products.

This standard applies to the authenticity inspection of leaf area index remote sensing products.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 36296-2018 Guidelines for authenticity inspection of remote sensing products

GB/T 39468-2020 General method for authenticity inspection of land quantitative remote sensing products

3 Terms and definitions

The following terms and definitions defined in GB/T 36296-2018 and GB/T 39468-2020 apply to this document.

3.1 Leaf area index; LAI

Half of the total area of the blade in the unit projected area of the ground.

3.2 Effective leaf area index

The leaf area index equal to the observed porosity value under the assumption that the leaves are randomly distributed.

Note: It can be obtained indirectly through optical instrument method measurement or remote sensing inversion.

3.3 Clumping index

Describe the spatial distribution pattern of leaves in the canopy, which are randomly distributed, regularly distributed, and clustered in nature.

3.4 Elementary sampling unit; ESU

The regional unit for leaf area index measurement deployed in the ground observation field.

3.5 Wireless sensor networks; WSN

A network formed by freely organizing and combining sensor nodes through wireless communication technology.

4 Basic requirements

The authenticity inspection of the leaf area index remote sensing product should meet the requirements of Chapter 7 in GB/T 36296-2018, and meet the following requirements.

a) When the inspection object is a single-day leaf area index remote sensing product, the difference in acquisition time between the reference object and the inspection object should be within 2 days; When the inspection object is a multi-day composite product of leaf area index, the acquisition time of the reference object should be in the composite product of leaf area index remote sensing. in time; […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Normative references

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