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Calculate gradient [message #70086]

Fri, 12 March 2010 13:41

mslarkin
Messages: 1
Registered: March 2010

Junior Member

Hi IDL experts,
I have a 2-D array (2708x4060), containing reflectance data. Is it
possible to calculate the reflectance gradient (i.e. the rate of
reflectance change over distance or array grid) throughout the array,
and then draw lines of equal gradient (note that they’re NOT contour
lines)?
Thank you very much for your help!
IDL beginner

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Re: Calculate gradient [message #70165 is a reply to message #70086]

Sun, 14 March 2010 10:16

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article
<32fa95d5-4856-4847-9f28-cfcac9ad4348@t20g2000yqe.googlegroups.com>,
mslarkin <enhlwang@gmail.com> wrote:

> Hi IDL experts,
> I have a 2-D array (2708x4060), containing reflectance data. Is it
> possible to calculate the reflectance gradient (i.e. the rate of
> reflectance change over distance or array grid) throughout the array,
> and then draw lines of equal gradient (note that they�re NOT contour
> lines)?
> Thank you very much for your help!
> IDL beginner

You need to be clearer. The gradient is a vector quantity. Do
you want to plot isopleths of the magnitude of the gradient?

Ken Bowman

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