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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 Desktop 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 ...

  1. #1
    Anonymous is offline Senior Member Black Belt
    Join Date
    Jul 2002
    Posts
    5,137

    gettign teh area inside a polygon or territory

    I am interested in gettign the area of a territory , state or polygon.

    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.

  2. #2
    Jack is offline Junior Member White Belt
    Join Date
    Jan 2003
    Posts
    8

    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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