| dc.description.abstract | Evaportranspiration is an important factor in hydrology cycle. Traditionally, it is measured by using basin or empirical formula with meteorology data, while it does not represent the evaportransporation over a regional area. With the advent of improved remote sensing technology, it becomes a surface parameter of research interest in the field of remote sensing.
The research presented here is to use satellite images in conjunction with the in-situ surface meteorological measurement, such as temperature and wind velocity, to estimate the surface heat fluxes that include soil heat flux, sensible heat flux, and latent heat flux. This method is based on surface energy balance to estimate the surface heat fluxes. Once the heat fluxes has been determined, the evaporation then can be derived from radiation and evaporation controlled lines.
The satellite data used for this study are the MODIS level 1D image obtaining from CSRSR (Center of Space and Remote Sensing Research), National Central University. The results showed two aspects, first, the tendency between retrieve NDVI and two rice agriculture cycles is in accordance. Second, comparing latent heat by using good surface albedo with ground measurement, the correlation coefficient is over 0.76. In the future, we can monitor the surface heat fluxes of paddy rice field in Chiayi area, and can correct and confirm the accuracy of the retrieve model. | en_US |