NDLI: Remotely monitoring evaporation rate and soil water status using thermal imaging and 'three-temperatures model (3T Model)' under field-scale conditions.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Qiu, Guo Yu Zhao, Ming
Description	Country affiliation: China Author Affiliation: Qiu GY ( School of Environment and Energy, Shenzhen Graduate School, Peking University, Shenzhen 518055, China. qiugy@szpku.edu.cn)
Abstract	Remote monitoring of soil evaporation and soil water status is necessary for water resource and environment management. Ground based remote sensing can be the bridge between satellite remote sensing and ground-based point measurement. The primary object of this study is to provide an algorithm to estimate evaporation and soil water status by remote sensing and to verify its accuracy. Observations were carried out in a flat field with varied soil water content. High-resolution thermal images were taken with a thermal camera; soil evaporation was measured with a weighing lysimeter; weather data were recorded at a nearby meteorological station. Based on the thermal imaging and the three-temperatures model (3T model), we developed an algorithm to estimate soil evaporation and soil water status. The required parameters of the proposed method were soil surface temperature, air temperature, and solar radiation. By using the proposed method, daily variation in soil evaporation was estimated. Meanwhile, soil water status was remotely monitored by using the soil evaporation transfer coefficient. Results showed that the daily variation trends of measured and estimated evaporation agreed with each other, with a regression line of y = 0.92x and coefficient of determination R(2) = 0.69. The simplicity of the proposed method makes the 3T model a potentially valuable tool for remote sensing.
File Format	HTM / HTML
ISSN	14640325
Issue Number	3
Volume Number	12
e-ISSN	14640333
Journal	Journal of Environmental Monitoring
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2010-03-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Environmental Health Soil Analysis Water Chemistry Algorithms Models, Chemical Temperature Volatilization Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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