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gettign teh area inside a polygon or territory
This is a discussion on gettign teh area inside a polygon or territory within the MapPoint 2006/2009 Discussion forums, part of the Map Forums category; I am interested in gettign the area of a territory , state or polygon. I often have territories of very ...
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10-16-2003
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| gettign teh area inside a polygon or territory I often have territories of very different sizes and these territories will have higher values inside teh territorty (sales for example) what I want is to beable to get sales densties. any idea. I f I had the value fo the area I could get something like sales per sq mile or soemthing and be able to compare diferent size regions for potential.         |
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10-18-2003
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| Area calculation
For calculating the surface area of a closed polygon there's a simple formula, that looks like: For i = 1 to n temp = temp + X[i] * (Y[i+1] - Y[i-1]) Next i Area = temp / 2 (if i=1, then Y[i-1] = Y[n]) (if i=n, then Y[i+1] = Y[1]) However, this works for plane X,Y coordinates, not the geographic latitude and longitud that you can extract from MapPoint. Therefore you'll have to convert to plane coordinates first. I didn't work it out yet, but perhaps an approximation is good enough (as you'll know 1 degree of longitud at the equator is about 111 km, but less at higher latitud). Greetings, Jack. |
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| Tags |
| area, gettign, inside, polygon, teh, territory |
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