[OpenLayers-Users] Calculating Resolutions

[Linda Rawson]

I think I need to do something similar to what this guy has been doing ->
http://trac.openlayers.org/ticket/889 but I am unsure.

What is boils down to is I need the user to see a 600px X 600px map.

The map should be projected in 4326.

The "lat/lon viewport" should be able to be converted to UTM.  When
converted to UTM the image should relate to 1200 meters X 1200 meters.

I have these lat/lon coordinates.

 ullon = -90.0685495;
 ullat = 38.6246312;
 lrlon = -90.0552241;
 lrlat = 38.6134851;

If I convert to UTM using the formulas here ->
http://www.koders.com/javascript/fid1D029A7E5070579F0F6B6CF3A9115FB82E0AFD69.aspx


 zone = Math.floor(((lon + 180) / 6) + 1);

I get the following in UTM

ul 755199.9576653754,4279199.867093539 lr 756400.339594843,4278000.552061474

ULLatUTM - LRLatUTM = 1200
ULLonUTM = LRLonUTM = 1200

But I can never get the map to display this box in the "viewport".  I can
never seem to get the resolution right. The closest I can come is 1200 X
1000 meters per pixel.  What can I do to return a "square" image?

Thanks,
Linda Rawson
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