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Multi and hyperspectral
Each pixel in a remote sensing image contains information
on the spectral signature for a feature on the ground. This
signature is a record of how much sunlight interacted with
the feature and was reflected back to the sensor in an aircraft
or satellite. Signatures are either multispectral or hyperspectral,
depending on the type of sensor. A multispectral sensor records
less than 10 types of reflected light and produces simple
spectral signatures. A hyperspectral system can measure over
1000 types of light and produces highly detailed signatures.
The advantage of hyperspectral systems is the production of
more detailed spectral signature, which enable more detailed
and accurate mapping of water column and benthic type attributes.
The following diagram shows the spectral
signatures of benthic bottom types using different
sensor types.
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