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An Automatic Instrument to Study the Spatial Scaling Behavior of Emissivity
Jing Tian1, Renhua Zhang2, Hongbo Su3
1Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China. tianj.04b@igsnrr.ac.cn.
Sensors (Basel, Switzerland)
|November 24, 2016
Summary
A new automatic instrument enables direct in situ measurement of land surface emissivity spatial distribution. This advances understanding of emissivity and temperature scaling, crucial for airborne and spaceborne applications.
Area of Science:
- Earth Science
- Remote Sensing
- Geophysics
Background:
- Accurate measurement of land surface emissivity is vital for understanding surface energy balance and thermal remote sensing.
- Existing methods for measuring emissivity spatial distribution are limited, hindering detailed analysis of surface properties.
Purpose of the Study:
- To present the design of an automatic instrument for direct in situ measurement of land surface emissivity spatial distribution.
- To investigate the spatial scaling behavior of emissivity and temperature.
- To provide a foundation for airborne and spaceborne emissivity measurements.
Main Methods:
- Design and implementation of an automatic instrument for in situ emissivity measurement.
- Experimental examination of emissivity measurement accuracy and uncertainty.
- Analysis of the impact of target temperature and environmental irradiance variations.
- Numerical simulations to determine optimal environmental temperature differences.
Main Results:
- The developed instrument allows for direct, in situ measurement of land surface emissivity spatial distribution.
- Experiments confirmed the instrument's accuracy and quantified measurement uncertainties.
- Analysis revealed the influence of temperature and irradiance on emissivity measurements.
- Numerical simulations identified ideal conditions for accurate measurements.
Conclusions:
- The new instrument facilitates the investigation of emissivity and temperature spatial scaling behavior.
- The instrument's design offers a theoretical and practical basis for airborne and spaceborne emissivity mapping.
- Understanding emissivity scaling due to target heterogeneity is enhanced.
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