10,613 research outputs found
LMODEL: A satellite precipitation methodology using cloud development modeling. Part I: Algorithm construction and calibration
The Lagrangian Model (LMODEL) is a new multisensor satellite rainfall monitoring methodology based on the use of a conceptual cloud-development model that is driven by geostationary satellite imagery and is locally updated using microwave-based rainfall measurements from low earth-orbiting platforms. This paper describes the cloud development model and updating procedures; the companion paper presents model validation results. The model uses single-band thermal infrared geostationary satellite imagery to characterize cloud motion, growth, and dispersal at high spatial resolution (similar to 4 km). These inputs drive a simple, linear, semi-Lagrangian, conceptual cloud mass balance model, incorporating separate representations of convective and stratiform processes. The model is locally updated against microwave satellite data using a two-stage process that scales precipitable water fluxes into the model and then updates model states using a Kalman filter. Model calibration and updating employ an empirical rainfall collocation methodology designed to compensate for the effects of measurement time difference, geolocation error, cloud parallax, and rainfall shear
Hyperbolic metamaterial as a tunable near-field spatial filter for the implementation of the active plasmon injection loss compensation scheme
We present how to physically realize the auxiliary source described in the
recently introduced active plasmon injection loss compensation scheme for
enhanced near-field superlensing. Particularly, we show that the
characteristics of the auxiliary source described in the active plasmon
injection scheme including tunable narrow-band and selective amplification via
convolution can be realized by using a hyperbolic metamaterial functioning as a
near-field spatial filter. Besides loss compensation, the proposed near-field
spatial filter can be useful for real-time high resolution edge detection.Comment: 8 pages, 8 figure
- …