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Re: Gradient idl [message #91785 is a reply to message #90577]

Wed, 26 August 2015 09:02

siumtesfai
Messages: 62
Registered: April 2013

Member

Hello

I used a function called Gradient by Ding Yuan( Ding.Yuan@warwick.ac.uk)

to calculate gradient of geopotential height.

It uses shift and centered finite difference. My question would be what would be the unit of the gradient. Unitless

But I input to the gradient function with climate model output data (i.e. geopotential height ( Scalar), which is interpolated to 2.5 by 2.5 degree latitude and longitude). Do I need to convert the units from degree to meters ?

result=gradient(data)

This would be in units of meter/degree. I would think i need to convert my result to unitless by multiplying the result with [2.5* 111000 degree/meter].

1 degree = 111km

I have data with a resolution of 2.5 by 2.5 degree .

What do you all think ?

Thanks
Best regards

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[Message index]

		Gradient idl By: siumtesfai on Mon, 09 March 2015 22:12
		Re: Gradient idl By: siumtesfai on Tue, 10 March 2015 09:00
		Re: Gradient idl By: Jeremy Bailin on Tue, 10 March 2015 09:13
		Re: Gradient idl By: siumtesfai on Tue, 10 March 2015 09:39
		Re: Gradient idl By: Jeremy Bailin on Wed, 11 March 2015 08:41
		Re: Gradient idl By: siumtesfai on Wed, 26 August 2015 09:02

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