Accurate determination of topography is required for a wide range of civilian and governmental applications. For example, modeling flood extent, flow velocity, and sediment transport associated with river networks requires bare-surface elevations with sub-meter height accuracy and spatial resolutions better than 10 meters. Strip-map interferometric synthetic aperture radar (INSAR) sensors have ...

In this article, I propose a new method for calculating and visualizing the pulse radiation within depth range commonly used by Ground Penetrating Radar (GPR). The text describes illustrates propagation with several examples. One conventional is also applied quick comparison. can be to optimize GPR antennas transmit shapes.

The principal focus of this program has been on understanding the nearshore problem from a top down point of view. At time scales longer than storm periods and length scales larger than 100 meters, the behavior of the nearshore appears surprisingly complex, with subtantial interannual variability and variability on all scales. We believe that this results from feedback between the fluid and bat...

AIMS To investigate the ability of a telecentric keratometer to describe the asphericity and curvature of convex ellipsoidal surfaces and human corneas. METHODS 22 conicoidal convex surfaces and 30 human corneas were examined by conventional keratometry. Additional keratometric measurements were made when the surface was tilted in the horizontal plane relative to the instrument optical axis. ...