Synergistic Evaluation of Passive Microwave and Optical/IR Data for Modelling Vegetation Transmissivity towards Improved Soil Moisture Retrieval

Sensors

卷:22

George P. Petropoulos¹  Mina Moradizadeh²  Prashant K. Srivastava³ 

[1] Department of Geography, Harokopio University of Athens, 17671 Athens, Greece;

[2] Department of Geomatics, Faculty of Civil and Transportation Engineering, University of Isfahan, Isfahan 8174673441, Iran;

[3] Remote Sensing Laboratory, Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India;

关键词: vegetation transmissivity;    land surface parameters;    microwave remote sensing;    AMSR2;    soil moisture;   

DOI  :  10.3390/s22041354

来源: DOAJ

【 摘 要 】

Vegetation cover and soil surface roughness are vital parameters in the soil moisture retrieval algorithms. Due to the high sensitivity of passive microwave and optical observations to Vegetation Water Content (VWC), this study assesses the integration of these two types of data to approximate the effect of vegetation on passive microwave Brightness Temperature (BT) to obtain the vegetation transmissivity parameter. For this purpose, a newly introduced index named Passive microwave and Optical Vegetation Index (POVI) was developed to improve the representativeness of VWC and converted into vegetation transmissivity through linear and nonlinear modelling approaches. The modified vegetation transmissivity is then applied in the Simultaneous Land Parameters Retrieval Model (SLPRM), which is an error minimization method for better retrieval of BT. Afterwards, the Volumetric Soil Moisture (VSM), Land Surface Temperature (LST) as well as canopy temperature (T_C) were retrieved through this method in a central region of Iran (300 × 130 km²) from November 2015 to August 2016. The algorithm validation returned promising results, with a 20% improvement in soil moisture retrieval.

【 授权许可】

Unknown