Can Excel calculate area for 3-D surface charts?

I have plotted data values (z axis) based on cartesion coordinate location (x
axis and y axis) as a 3D surface chart and then changed the elevation to 90
degrees to get a topographical/isobar representation of the data. Is it
possible to get the area contained within the isobar lines? If Excel can't
do this is there an add-in or another product that can do this?

Dunno if this will help, but see Bernard Liengme's
http://www.stfx.ca/people/bliengme/E...UnderCurve.htm and
http://www.stfx.ca/people/bliengme/E...olygonArea.htm

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Regards,

Tushar Mehta
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions

In article <[email protected]>,
[email protected] says...
> I have plotted data values (z axis) based on cartesion coordinate location (x
> axis and y axis) as a 3D surface chart and then changed the elevation to 90
> degrees to get a topographical/isobar representation of the data. Is it
> possible to get the area contained within the isobar lines? If Excel can't
> do this is there an add-in or another product that can do this?
>

I doubt it. I think he's looking for the plan view area of each region, i.e., each
colored band between defined limits.

I remember the good old days, pre-Excel. We had a fancy device called a planimeter
to measure these areas. A less elaborate procedure consisted of cutting out the
areas and weighing them, dividing by the total weight, and multiplying by the total
area.

- Jon
-------
Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions
http://PeltierTech.com/
_______

Tushar Mehta wrote:

> Dunno if this will help, but see Bernard Liengme's
> http://www.stfx.ca/people/bliengme/E...UnderCurve.htm and
> http://www.stfx.ca/people/bliengme/E...olygonArea.htm
>