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gaussian air dispersion model [message #46529]

Thu, 24 November 2005 08:48

guillaume.drolet.1
Messages: 20
Registered: July 2005

Junior Member

Hi,

I am using spatial remote sensing data (reflectances over vegetation)
along with field eddy-covariance data, i.e. energy and mass fluxes from
towers to develop better ways of estimating forest productivity.

For a given period, the vegetated area contributing to the fluxes
(footprint) depends on several factors (e.g., wind speed and
direction,surface roughness length, etc.) and can be modeled using a
footprint model.

To extract the data for the pixels contributing to the measured fluxes,
I will use an across-wind integrated footprint model that will give me
the across-wind distance (x-extent) of the footprint (i.e., the minor
axis of an ellipse). Since I have several periods of flux data for
which I need to run the footprint model, I cannot use a
fully-parameterized footprint model that would give me the along- and
cross-wind extents of the footprint. Thus, I need to use a gaussian
dispersion model to estimate the along-wind distance. Knowing both x-
and y- extents, I will be able to create ellipses that will serve as my
'ROIs' to extact reflectance data.

Since I do almost all my work with IDL, I am looking for IDL ways of
estimating along-wind distances of the footprints using a gaussian
dispersion model (functions, procedures, etc.). I don't have a strong
background in physics so I need some solutions I will understand. My
background is mostly in forest sciences and remote sensing and I do a
lot of programming.

Thanks a lot for your help.

Gui

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[Message index]

		gaussian air dispersion model By: guillaume.drolet.1 on Thu, 24 November 2005 08:48
		Re: gaussian air dispersion model By: guillaume.drolet.1 on Tue, 29 November 2005 06:56
		Re: gaussian air dispersion model By: K. Bowman on Tue, 29 November 2005 06:27
		Re: gaussian air dispersion model By: David Fanning on Mon, 28 November 2005 20:28
		Re: gaussian air dispersion model By: Mark Hadfield on Mon, 28 November 2005 20:00
		Re: gaussian air dispersion model By: guillaume.drolet.1 on Mon, 28 November 2005 19:18
		Re: gaussian air dispersion model By: Mark Hadfield on Mon, 28 November 2005 16:04

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