GB/T 40038-2021Validation of vegetation index remote sensing products (English PDF)
植被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 40038-2021 is the English-translated version of 植被指数遥感产品真实性检验.
GB/T 40038-2021 sets out how the authenticity of a vegetation index remote sensing product is checked.
It gives the basic requirements for the work, the choice between the direct and the indirect validation method, the two methods themselves, and what the validation report must contain, from the cover information to the body information and the summary.
It defines the quantities the check relies on - the bidirectional reflectance distribution function, the bidirectional reflectance factor, spectral reflectance, the spectral response function and the vegetation index - and a normative Annex A describes how the ground bidirectional reflectance factor is measured.
It applies to vegetation index products at the bottom of the atmosphere, so that the accuracy and the uncertainty of different products become comparable. It was issued on 30 April 2021 and has applied since 1 November 2021.
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Document preview — GB/T 40038-2021
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
Contents
- Foreword
- Introduction
- 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
- 5.3 Indirect inspection method
- 6 Inspection report
- 6.1 Cover information
- 6.2 Body information
- 6.3 Summary of inspection report information
- Appendix A (normative appendix) Ground bidirectional reflectivity factor measurement
- Reference
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Introduction
The vegetation index is a series of indexes formed by the linear or non-linear combination of two or more remote sensing sensor band data, which can be used for diagnosis Vegetation growth status, green vegetation vitality and inversion of various vegetation parameters.
The vegetation index has a variety of specific definitions, such as the ratio of the reflectance ratio of the red light band and the near-infrared band, the vegetation index (RVI) and the Normalized Vegetation Index (NDVI), the Soil Regulated Vegetation Index (SAVI) that reduces the soil background, and the increase in sensitivity to dense vegetation areas Strong Vegetation Index (EVI), etc.
The reflectance of sensors with red and near-infrared bands is often used to calculate the vegetation index, which is based on multiple global vegetation index products Has been released. Due to the limitations of data and algorithms, there are inevitably errors in vegetation index products, which need to be verified for authenticity to obtain Obtain the accuracy and uncertainty of the product. In the past, due to different verified data, processes, and evaluation standards, the accuracy of the products obtained was not comparable.
Brings difficulties to users in quantitative applications. Therefore, it is necessary to formulate scientific and standardized verification standards for the authenticity of vegetation index remote sensing products.
1 Scope
This standard specifies the basic requirements, inspection methods and inspection reports for the authenticity inspection of vegetation index remote sensing products.
This standard is applicable to the authenticity inspection of remote sensing products of the vegetation index of the bottom of the atmosphere.
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 references, the latest version (including all modified versions) 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 Bidirectional reflectance distribution function
The ratio of the microincrement of reflected irradiance in a specific direction on the surface of an object to the microincrement of incident irradiance in a specific direction.
Note: The unit is degree per sphere (sr-1). [GB/T 36299-2018, definition 3.6]
3.2 Bidirectional reflectance factor
The reflected radiance of the surface of the object in a specific direction and the reflected radiance of an ideal diffuse reflector in that direction under the same irradiance condition Ratio. [GB/T 36299-2018, definition 3.7]
3.3 Spectral reflectivity
The ratio of the reflected radiant flux of an object to a certain band of electromagnetic waves and its incident radiant flux.
3.4 Spectral response function
Describe the function of the response rate of the remote sensor to the incident radiation at different wavelengths.
3.5 Vegetation index
A linear or non-linear combination of remote sensing image data from different spectral bands can reflect the growth and distribution of green plants Characteristic index. [GB/T 30115-2013, definition 3.11]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 36296-2018 — Guide for the validation of remote sensing products
GB/T 39468-2020 — General methods for the validation of terrestrial quantitative remote sensing products
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