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Calculating Area

Asked Jan 26, 2009, 03:41 PM — 1 Answer
I am a Landscape student and I am attempting to calculate the surface area of a slope of various polygonal forms (landscape areas).

In the attachments you will find one is a simple calculation for a triangle prism. This is whee I need to start from.

After that the prisms become more complex.

I want to know that if I have the base area (2D) of an area, say for example looking at a map in plan view, and I also know the rise/drop (as in a change in contours), is it possible to use this information to generate, say a percentage increase to then apply to the slope area to generate an answer.

I think the images should explain better than I can.

Thanks

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File Type: pdf SURFACE AREA 2.pdf (37.4 KB, 102 views)
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ROLCAM Posts: 1,437, Reputation: 250
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Jan 26, 2009, 04:41 PM
The image says it all.

The area you need is :- x

Look at x and call the top perimiter d and
The bottom perimiter e.

Now the area formula becomes:-

c times { 1/2 (d + e)

This should be accurate enough.
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