GB/T 40033-2021Validation of land surface evapotranspiration remote sensing products (English PDF)

Foreword

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

Introduction

Surface evapotranspiration is the sum of vegetation transpiration, evaporation of precipitation intercepted by soil, water, and vegetation canopy, as well as the sublimation of ice and snow. It is the surface energy An important component of balance and water cycle. Remote sensing technology is one of the effective means to obtain continuous surface evapotranspiration in time and space.

Remote sensing products of surface evapotranspiration at global and regional scales. Due to the limitations of algorithms and data, remote sensing products for surface evapotranspiration inevitably exist Errors need to be verified for authenticity. However, due to differences in verification data, inspection methods, and evaluation indicators, the current authenticity test results The results are not comparable, so it is necessary to formulate scientific and standardized testing standards for the authenticity of remote sensing products of surface evapotranspiration.

1 Scope

This standard specifies the basic requirements, inspection methods and inspection reports for the authenticity inspection of remote sensing products for surface evapotranspiration.

This standard is applicable to the authenticity inspection of remote sensing products of surface evapotranspiration on a daily/monthly/year global scale and regional scale.

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.

4 Basic requirements

The authenticity inspection of remote sensing products for surface evapotranspiration shall comply with the provisions of Chapter 7 of GB/T 36296-2018 and meet the following requirements.

a) The reference object should be in the same area at the same time as the remote sensing product of surface evapotranspiration to be inspected;

b) The reference object should cover the main surface types of the inspection area, with high, medium and low surface evapotranspiration values;

c) The reference object should be the first choice to observe the surface evapotranspiration data from the ground, or it can be selected as the projection method of the remote sensing product of the surface evapotranspiration to be inspected. Remote sensing products (or model products, reanalysis data, etc.) that have been inspected or multiple types of land surface evapotranspiration to be inspected with the same temporal and spatial resolution, or Data on the impact factors of surface evapotranspiration have been checked.

5 Inspection method