Questions as self-test:
The answers to these questions do
not need to be handed in. The reason will become clear. Do not be tempted to
look at the answers immediately, but think about the questions first.
- Give three properties of remote sensing which may have a clear added value in respect to traditional field work.
To the answers
- The first requirement for remote sensing is an energy source which
can illuminate a target. What is the obvious source of electromagnetic
energy that you can think of? What "remote sensing device" do you
personally use to detect this energy?
To the answers
- The infrared portion of the electromagnetic spectrum has two parts: the
reflective and the emissive. Can you take photographs in these wavelength
ranges?
To the answers
- Most remote sensing systems avoid detecting and recording wavelengths in
the ultraviolet and blue portions of the spectrum. Explain why this would be
the case.
To the answers
- What do you think would be some of the best atmospheric conditions for
remote sensing in the visible portion of the spectrum?
To the answers
- On a clear night with the crescent or half moon showing, it is possible to
see the outline and perhaps very slight detail of the dark portion of the
moon. Where is the light coming from, that illuminates the dark side of the
moon?
To the answers
- Is there a passive equivalent to the radar sensor?
To the answers
- Why is geometrical registration so important for the integration of
data from different sources?
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- Should these data also be geo-referenced?
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- If you wanted to map the deciduous (e.g. maple, birch) and the coniferous
(e.g. pine, fir, spruce) trees in a mixed forest in summer using remote
sensing data, what would be the best way to go about this and why? Use the
reflectance curves below illustrating the spectral response patterns of
these two categories to help explain your answer.
To the answers