By Seelye Martin
Absolutely up-to-date, with major new insurance of advances in satellite tv for pc oceanography and effects from new satellite tv for pc missions, the second one version of this well known textbook introduces scholars to how distant sensing works, tips on how to comprehend observations from Earth-observing structures, and the observations' significance to actual and organic oceanography. It presents complete motives of radiative move, ocean floor houses, satellite tv for pc orbits, tools and strategies, obvious distant sensing of biogeochemical homes, infrared and microwave retrieval of sea floor temperature, sea floor salinity retrieval, passive microwave measurements, scatterometer wind retrieval, altimetry and SAR. additionally integrated are descriptions of the net data the place information may be got, and readers can receive on-line instruments for operating with the knowledge - permitting hands-on engagement with real-world observations. this is often an excellent textbook for graduate and complicated undergraduate scholars in oceanography, distant sensing and environmental technological know-how, and a realistic source for researchers and pros operating with oceanographic satellite tv for pc information.
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Extra info for An Introduction to Ocean Remote Sensing
For each wavelength band, the detectors are focused on a mirror mounted at a 45° angle to its axis of rotation that rotates uniformly around 360°. At the same time as the rotating mirror sweeps the FOV across the surface, the satellite motion moves it along the satellite trajectory, so that an image is constructed from the successive parallel scans. Because the mirror rotates as the satellite advances, the scan lines lie at an oblique angle to the satellite trajectory. The figure also shows a calibration source that is held at a constant radiance.
This further increases the FOV, where the time-averaged FOV is called the effective field-of-view (EFOV). 7 describes in more detail, on the ground the data are resampled to a uniform grid, where each cell in the grid has the area of the nadir FOV. Given the increase in both atmospheric interference and EFOV with increasing zenith angle, data taken at θV greater than 45–55° are noisier than data taken near nadir. Finally, some sensors such as the Optical Line Scanner (OLS) on the DMSP satellite and the Day–Night Band (DNB) on VIIRS use a variety of techniques such as a variable-focus telescope to adjust the instrument solid angle so that the FOV area is independent of look angle.
For a nadir view, the FOV is a circle; because of the Earth’s curvature at off-nadir view angles, the FOV is an ellipse. 2 Cross-track or whiskbroom scanners The next sub-sections describe three scanning techniques that are primarily used in the visible/infrared and in low Earth orbits, while Chapter 8 describes the analogous microwave scanners. First, whiskbroom scanners construct images from the combination of the satellite motion along its trajectory and the rotation of a telescope–mirror combination relative to the spacecraft.
An Introduction to Ocean Remote Sensing by Seelye Martin