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POMap projections
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  1. POMap projections
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    copied!<p>I am building a 'flat earth' 3D model of a small area of land for a simulation. Using google earth, I get the lat lon values for some grid lines near my chosen origin.</p> <p>Then, using the <a href="http://movable-type.co.uk/scripts/latlong-vincenty.html" rel="nofollow">Vincenty distance algorithm</a> I get xy distances from my origin to place the grid lines the right distance apart in my 'flat' 3D model.</p> <p>In my simulation I use the <a href="http://www.movable-type.co.uk/scripts/latlong-vincenty-direct.html" rel="nofollow">Vincenty 'Direct' algorithm</a> to display my players lat lon, all this works very well, and matches up well enough with google earth.</p> <p>(There is a faster (less accurate) 'direct' algorithm <a href="http://www.movable-type.co.uk/scripts/latlong.html" rel="nofollow">here</a> (down page: 'Destination point given distance and bearing from start point '))</p> <p>If I measure a grid square where the degrees apart are 0.0036 in both lat and lon, the x value in meters is approx: 356.9 &amp; the y value is approx: 400.9, This is pretty much the same as google earth, when I use it's measure tool. So basically a rectangle stretched a little in latitude. This suggests cylindrical projection? (Google use: wgs84/pseudo mercator (I think)) my model looks like a type of mercator.</p> <p>So I have my homemade flat earth model that works fine, now for my question :-) (at last they say!)</p> <p>What have I made? i.e. <strong>what projection is it</strong>?</p> <p>(It would be nice if I could plug those values above into an app and out pops my projection!)</p> <p>(The Vincenty algorthms use an Ellipsoid (WGS-84 in most cases) model.)</p> <p>Anyway thanks for any ideas!</p>
 

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