Brightness - Remote Sensing and GIS Laboratory
Brightness - Remote Sensing and GIS Laboratory
Brightness - Remote Sensing and GIS Laboratory
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Lecture review…<br />
<strong>Brightness</strong> defined in the direction of soil<br />
reflectance variation. Obtained from a weighted<br />
sum of all b<strong>and</strong>s. i.e. urbanized <strong>and</strong> bare soil<br />
areas are evident in this image.<br />
Greenness defined in the direction of<br />
vegetation reflectance variation. Obtained from<br />
the contrast of the visible b<strong>and</strong>s (high absorption)<br />
with the infrared b<strong>and</strong>s (high reflectance). i.e. the<br />
greater the biomass, the brighter the pixel value<br />
in this image.<br />
Greenness<br />
Water<br />
Healthy – dense<br />
vegetation<br />
Clear Turbid<br />
<strong>Brightness</strong><br />
Concrete<br />
Bare soil<br />
Wetness information concerning the moisture<br />
status of the environment (soil & plant moisture).<br />
Obtained from the contrast of the sum of visible<br />
<strong>and</strong> near-infrared with the sum of longer-infrared<br />
b<strong>and</strong>s. i.e. water bodies are very bright – greater<br />
the moisture content = brighter response.<br />
Third<br />
Water<br />
Clear Turbid<br />
Wet soil<br />
<strong>Brightness</strong><br />
Concrete –<br />
Bare soil<br />
Dry soil<br />
Jensen - 2005
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