GB/T 41541-2022 in English
VALIDBasic terminology of thermal infrared remote sensing
- Issued on:2022-07-11
- Implemented on:2023-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 41541-2022热红外遥感基本术语》由TC327（全国遥感技术标准化技术委员会）归口，主管部门为中国科学院。
Introduction
Standard Overview and Background
GB/T41541-2022 is my country's first basic terminology standard specifically for the field of thermal infrared remote sensing. It was jointly developed by the Chinese Academy of Sciences and 12 scientific research institutions. The standard fills the gap in the terminology system of the 6μm~15μm spectral range and provides a unified specification for the development of remote sensing sensors and data inversion algorithms.
Core Terminology System
| Term Category | Definition Number | Key Parameters | Typical Applications |
|---|---|---|---|
| General Terms | 41 Items | Radiant Brightness, Brightness Temperature, Thermal Inertia | Basic Theoretical Research |
| Uniform Surface Terms | 9 Items | Directional Emissivity, Thermal Conductivity | Farmland Temperature Monitoring |
| Non-Uniform Surface Terms | 7 Items | Apparent Emissivity, Component Temperature | Urban Heat Island Effect Analysis |
Analysis of key technologies
Radiative transfer equation
Appendix A of the standard gives a simplified equation:
Lλ(θ,φ)=τλ·ελ·Bλ(Ts)+atmospheric path radiation term+ambient reflection term
This equation is the basis for quantitative inversion of thermal infrared sensor data, involving key parameters such as atmospheric transmittance τλ and surface emissivity ελ.
Comparison of temperature inversion algorithms
Appendix B of the standard specifies four types of algorithms:
- Single-channel algorithm: Applicable to the atmospheric window band, requires known emissivity
- Split-window algorithm: Uses 10-12μm dual-channel difference to correct atmospheric effects
- Temperature emissivity separation algorithm: Requires ≥3 spectral channels
- Day-night algorithm: Solved through multi-temporal data constraints
Recommendations for the implementation of the standard
- Scientific research field: It is recommended to uniformly use the terms brightness temperature(3.21) and radiation temperature(3.20) to distinguish
- Engineering application: For non-uniform surfaces, radiation temperature(3.21) is preferred. class=instrument>Directional apparent emissivity(5.4) concept
- Educational communication: The physical relationship between Planck's law(3.10) and Kirchhoff's law(3.13) needs to be explained
Technology evolution analysis
Compared with GB/T36299-2018, this standard adds:
- Non-uniform surface temperature characterization system (5.1-5.7)
- Penetration depth calculation formula (3.17)
- Channel equivalent parameter weight function (3.35-3.36)
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