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| Subject: | [gislist] Re: GISList: 3 questions |
| Date: |
08/27/2003 09:15:01 AM |
| From: |
Pat Waggaman |
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At 02:08 PM 8/27/2003, viktoras wrote:
>Hi,
>
>1. Is there a very practical, well tested and trustable way to identify oil
>spills (small scale) in open sea areas from spatial (satellite) imagery. In
>general I'd need a "hands on" tutorial (satellites, bands, processing,
>resolution, etc...) on this subject. Should sound like "detecting oil spills
>in oil drilling platforms from satellite imagery" or whatever :-)... Does
>anybody know of any ?
You can get very detailed satellite imagery, at a certain place and
time. There is currently insufficient - publicly available - satellite
imagery available to do a reasonably serious search for oil residues. I
doubt that currently there is anywhere a sufficiently intensive satellite
surveillance effort to locate random oil spills in the 2/3 of the planet
that is ocean. It's economics, that's a lot of "real estate" in which to
look for oil spills, and the value-added by those images is less than
imagery of f'rinstance Iraqui oil pipelines.
Technically it should be possible, see SeaWifs for color in image bands,
infrared imagery for burning oil, and I would imagine that any of the good
multi-band products would be able to determine different refractory
properties of oil from water.
>
>2. I'm also collecting all possible info on methods used to eliminate
>various sampling-related artifacts (is there any classification of these ?)
>from bathymetric DEM's. Especially on data handling prior to interpolation
>although post-interpolation techniques are also of some interest.
That's a real serious subject, lots of very specific technical issues all
over the place: and the entire issue is intensely flavored with lots of
"garbage in garbage out" pitfalls. Such as: the physics of wave motion in
liquid with different salinity content & temperature: optimum precision
portions of datasets and "not so accurate" portions: and very expensive
hardware not to mention that the ships to drag it around cost in the
thousands / hour. Talk to your local hydrographer, marine geophysicist or
petroleum seismologist.
Pat
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