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A new era of commercial high-resolution imagery from space began late in 1999 resulting in resolution that is now sufficient to resolve marine mammals. This encouraged investigating the use of satellite imagery for marine-mammal population census and related studies. The question was raised: Can marine mammals be reliably detected above sensor noise and(More)
As is well known the velocity of ocean surface gravity waves can be inverted into a map of bathymetry. All of the many implementations of this idea analyze a 3D Fourier transform of an image cube of certain dimensions in xy and time. A minimum length in xy and time span are deemed essential for the algorithms to work. Some examples: Hoogeboom et al. [1],(More)
The near shore bathymetry can be mapped with remote sensing of the motion of shoaling gravity waves. This method can be used with satellite imaging systems that can image a series of images with high resolution. Previous validation of this technique used two satellite images taken 10 s apart.. This paper reports on another validation with images in the(More)
The exploitation of synthetic aperture properties in nadir-looking radars is opening new scenarios in the framework of satellite radar altimetry. Both recent and upcoming missions including Cryosat-2, Sentinel-3, Sentinel-6 and SWOT take benefit from the coherent processing of radar data, aimed at improving range measurements in particular contexts, such as(More)
This paper follows earlier work showing a new approach to observe water bodies from Earth orbiting satellites [1, 2, 3, 4]. The basic idea was the measurement of the water volume as first developed by Heron, a mathematician and citizen of ancient Alexandria. As the water level rises and falls, the volume of slices of the water column can be measured. Each(More)
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