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Re: Calculating area of latitude-longitude quadrangle? [message #77311]

Wed, 24 August 2011 00:54

Maxwell Peck
Messages: 61
Registered: February 2010

Member

On Aug 24, 4:52 am, Ashley Berg <ashley.b...@gmail.com> wrote:
> Is there any way to calculate the area of a latitude-longitude
> quadrangle in IDL, or some formula I could use?
> MATLAB can (using areaquad from the Mapping Toolbox, which can return
> surface area in km^2 of a lat/lon box covering a part of Earth) but I
> do not have access to MATLAB.

When I had to do something similar in Excel (don't ask!) I broke it up
into two triangles, found the internal angles (google Aviation
Formulas) and used Girard's theorem to find the area of each triangle
and added them together.

Max

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[Message index]

		Re: Calculating area of latitude-longitude quadrangle? By: Maxwell Peck on Wed, 24 August 2011 00:54
		Re: Calculating area of latitude-longitude quadrangle? By: R.G.Stockwell on Tue, 23 August 2011 13:37
		Re: Calculating area of latitude-longitude quadrangle? By: Ashley Berg on Tue, 23 August 2011 13:06
		Re: Calculating area of latitude-longitude quadrangle? By: David Fanning on Tue, 23 August 2011 12:13

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