Title :
Evaluation of vegetation indices based on microwave data by simulation and measurements
Author :
Li, Yunqing ; Zhang, Lixin ; Jiang, Lingmei ; Zhang, Zhongjun ; Zhao, Tianjie
Author_Institution :
State Key Lab. of Remote Sensing Sci., Beijing Normal Univ., Beijing, China
Abstract :
As an indicator of vegetation, vegetation index, such as Microwave Polarization Difference Temperatures (MPDT), Microwave Polarization Difference Index (MPDI) and Microwave Vegetation Indices (MVIs), is widely used in vegetation water content (VWC) and soil moisture retrieval. In this essay, Ferrazzoli´s radiative transfer model was utilized for simulation, and a truck-mounted Microwave Radiometer (BNU-TMMR) for experiments. Subsequently, there comes a comparison and evaluation of the three vegetation indices´ sensitivity to soil moisture and VWC which were proposed by both utilizing model simulation and field measurements. MPDT and MPDI increase with soil moisture rising up, and are more sensitive to lower soil moisture, while the trend of MVIs_B is smooth. In term of VWC influence, MVIs_B has higher sensitivity to lower VWC vegetation, and they are all negatively correlated to VWC.
Keywords :
hydrology; microwave measurement; radiative transfer; soil; vegetation; vegetation mapping; BNU-TMMR; Ferrazzoli radiative transfer model; MPDI; MPDT; MVI; microwave measurement; microwave polarization difference index; microwave polarization difference temperatures; microwave vegetation indices; soil moisture retrieval; truck-mounted microwave radiometer; vegetation index; vegetation water content; Microwave radiometry; Microwave theory and techniques; Soil measurements; Soil moisture; Vegetation; Vegetation mapping; Vegetation Indices; radiative transfer model; track-monted microwave radiometer experiments;
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2010 IEEE International
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-9565-8
Electronic_ISBN :
2153-6996
DOI :
10.1109/IGARSS.2010.5649579
