GEOG 330 Chapter 12 - Remote Sensing of Water GEOG330...

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Remote Sensing of Water GEOG330
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Worldwide Water Distribution ! 74% of the Earth’s surface is water " Of this, 97% is in saline oceans " 2.2% in permanent icecaps & glaciers " 0.6% in underground aquifers " 0.02% is in freshwater streams, lakes, soil moisture & atmosphere
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Remote Sensing of Water ! Hydrologic applications include: " Surface water " Oceans " Precipitation " Clouds " Water vapor " Snow " Water quality monitoring
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Remote Sensing of Water – Environmental Monitoring
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Remote Sensing of Water – Environmental Monitoring
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Remote Sensing of Water – Environmental Monitoring
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Remote Sensing of Water – Environmental Monitoring Oil Seeps Lake Maracaibo, Venezuela (Jan 2003)
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Remote Sensing of Water – Environmental Monitoring The Oil Spill – MODIS June 19, 2010
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Remote Sensing of Water – Environmental Monitoring
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Remote Sensing of Water – Environmental Monitoring
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Remote Sensing of Water – Environmental Monitoring
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Remote Sensing of Water – Environmental Monitoring
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Remote Sensing of Water – Environmental Monitoring
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Wednesday, 18 July 2007, 11:01 GMT 12:01 UK Gulf dead zone to be biggest ever - That year saw the biggest "dead zone" since records began in the waters of the Gulf of Mexico. Remote Sensing of Water – Environmental Monitoring
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Remote Sensing of Water ! RS potential for hydrologic applications: " Provides a synoptic view " Can be used to expand or interpolate field-based ( in situ ) observations " Can collect data where field observations are difficult to obtain " Can provide frequent observations at global scales
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Water-Energy Interactions ! Total radiance ( L t ) is a function of: " Energy that has never reached the water surface Atmospheric scattering ( L p ) " Energy reflected from water surface Water surface radiance ( L s ) " Energy that has penetrated water but then reflected back Subsurface volumetric scattering ( L v ) " Energy that has penetrated the water, reached the bottom, and been reflected Radiance from the bottom ( L b )
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Radiance from Water
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Effect of Sunglint ! The sunglint effect occurs when the solar zenith angle and the sensor viewing angle are almost identical, resulting in a purely specular reflection from the surface of the water body.
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Water-Energy Interactions ! Goal is to extract only the component of interest: " For example, separate bottom radiance ( Lb ) from others: L b = L t – ( L p + L s + L v ) " Requires careful calibration to remove other effects Bottom radiance Total radiance Atmospheric scattering Water surface radiance Subsurface volumetric radiance
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Spectral Response of Water !
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This note was uploaded on 01/16/2012 for the course GEOG 330 taught by Professor Marsh during the Fall '07 term at University of Arizona- Tucson.

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GEOG 330 Chapter 12 - Remote Sensing of Water GEOG330...

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