Optical remote sensing
6 important questions on Optical remote sensing
What type of sensor characteristics (spatial, spectral, and temporal resolution) do you use to monitor the genreal health of all vegetaion cover over Europe for several months?
Spatial resolution: thus fairly coarse sensor
Revisit period: shorter with broad areal coverage
Spactral resolution: not necessarily require high spectral, but at minimum requires channels in the visible and near-infrared regions of the spectrum.
What are advantages of hyperspectral scanners? And some disadvantages?
- Very high spectral resolution because of their narrow bandwiths
- Very detailed pixel images: because measurements over small wavelenghts are made
- This allows: fine differentiation between targets based on detailed reflectance and absoption responses which are not detectable using the broad wavelenght ranges of conventional multispectral scanners
- Disadvantage: large volume of data collection --> storage and manipulation of the data difficult
Suppose you have a digital image which has a radiometric resolution of 6 bits. What is the maximum value of the digital number which could be represented in that image?
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