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Many remote sensing technologies were used to evaluate plant physioecology. However, few studies currently existed on the comparisons and the relationships among various remote sensing analyses methods. The objective of our study was to investigate the relationship of leaf image, chlorophyll fluorescence, reflectance with SPAD, and build the models from SPAD using the data obtained from rice and barley...
Resolution is a key index in evaluating a haptic device. High resolution provides good performance for haptic device. In this paper, the resolution of iFeel6, a 6 degree of freedom (DOF) cable-driven haptic device, is analyzed. For the presented haptic device, the resolution is divided into translational resolution and rotational resolution. Each of them is defined in this paper. Then a method of...
Leaf color has been commonly used as an index for crop stress status diagnosis. We have developed a low-cost and non-destructive method that is easy to use to assess the health status of plants, based on the estimation of chlorophyll content of leaves using a portable digital camera. Relationships between chlorophyll content and leaf image color indices in the RGB and Lab* space with the comparison...
The reflectance of rice that infects different severity leaf blasts was measured through artificial inoculation and disease index (DI) of the rice corresponding to the spectra which were acquired in the field. The correlation between DI and the first derivative data was analyzed. The estimation models of DI were built using regression methods, and RMSE were used to test its precision. The result showed...
This study demonstrates the potentials of HJ-1 hyperspectral sensor (110-128 bands)-based estimation of aboveground biomass in Hangzhou Bay Zhejiang Province, China. We coupled AGB values, calculated from field measurements of vegetation, with six different vegetation indices derived from HJ1 data through regression analyses to produce an initial biomass map. The results showed that above-ground biomass...
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