AREA = SUM(COS(SLOPE) * A * A),
where
A is the lenght of the side of a grid cell, SLOPE is slope angle at each cell
You have to calculate it cell by cell. Can be easily done by, for instance, Grid Calculator module of Grid Analyser (www.terris.sk), which can calculate slopes as well. Calculate COS(SLOPE) * A * A first and than look at SUM in STATISTICS tab, which should show the value you are looking for.
Hope this helps,
Jaromir SVASTA
On Tue, 20 Jan 2004 13:27:50 -0700, Lafleche, Marc <[EMAIL PROTECTED]> wrote:
Hello all!
I want to find out how to calculate the surface area of a grid.
I know how to get the volume of a grid but I need the "3D" Surface Area. If
I double click on the polygon outline I get a value but it does not take the
elevation into account... Is this possible at all?
Thanks,
Marc
--------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 10013
--------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 10023
