This might work for you. Surveyor's Formula
Date: 06/05/99 at 11:20:14 From: Alessandro Pagani Subject: Area of irregular nonconvex polygon I'm a student of the Politecnico di Milano (Italy) as an environmental engineer. I need a method to calculate the area of an irregular polygon in a Visual Basic program. On your website, I've read about a formula to be used in a program when I have the lengths of all the sides and some of the angles. My problem is different: I have all the spatial topographic coordinates of the points of a drainage area that may be nonconvex. Can you help me? Thanks. Date: 06/06/99 at 08:25:42 From: Doctor Jerry Subject: Re: Area of irregular nonconvex polygon Hello Alessandro, You can use the "surveyor's formula." It gives the area of any planar polygon. If the vertices are (x1,y1), (x2,y2), ..., (xn,yy), then A = (1/2)[Det(x1,x2,y1,y2)+Det(x2,x3,y2,y3)+ ... +Det(xn,x1,yn,y1)], where Det(a,b,c,d) = a*d-b*c. - Doctor Jerry, The Math Forum http://mathforum.org/dr.math/ Douglas S. Learman Principal Price Learman Branding Design Strategic Branding • Advertising • Print Media • Web Design 218 Main Street #619 • Kirkland WA 98033 tel: 425.803.0333 fax: 425.803.0452 www.pricelearman.com On Jul 27, 2010, at 4:48 PM, laxmidi1994 wrote: > Hi, > > How do I calculate the area of my irregularly shaped overlay? > > I've got a upon which map that I put an overlay. I'd like to be able > to tell the user that overlay A is X sq. meters. > > Any suggestions? > > Thank you. > > -Laxmidi > > -- > You received this message because you are subscribed to the Google Groups > "Google Maps API For Flash" group. > To post to this group, send email to > [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-maps-api-for-flash?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google Maps API For Flash" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-api-for-flash?hl=en.
