Thanks you guys. You are the greatest. Linda Rawson
On 9/26/07, Arnd Wippermann <[EMAIL PROTECTED]> wrote: > > Hello Linda, > > to get myself some knowledge with scales and resolutions, i have build a > little example. The resolution for your extent must be 0.00009633333333333 > (= dx/WIDTH), then you get - with the right centerpoint - your area. > Change in your resolutions 0.0000858306884765625 with 0.00009633333333333. > One hint: to set own resolutions for google layers is not possible. > > To calculate scales for various units you must keep in mind to take the > right factor. Also must dx/WIDTH=dy/HEIGHT. > > Einheit Faktor > inches 1 > ft 12 > mi 63360 > m 39,3701 > km 39370,1 > dd 4374754 > in 1 > > dpi 72 > Einheit dd > Faktor 4374754 > > Left -122,1655000 > Right -122,1077000 > Top 43,0083000 > Bottom 42,9505000 > WIDTH 600 pixel > HEIGHT 600 pixel > dx 0,0578 LE > dy 0,0578 LE > Scale 30343,29374 > Resolution 0,000096333333 > > Scale = dx/WIDTH * dpi * Faktor > Resolution = dx/WIDTH > > I hope that will help to solve your problem. > > Mit freundlichen Grüssen > > Arnd Wippermann > http://gis.ibbeck.de/ginfo/ > > > ________________________________ > > Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im > Auftrag von Linda Rawson > Gesendet: Mittwoch, 26. September 2007 06:05 > An: [email protected] > Betreff: [OpenLayers-Users] Formula for calculating resolution? > > > I have a legacy mapping system that I am trying to convert to openlayers. > MG. It is bad. > > Anyway, I have the following dimensions of a 600 X 600 window. > var bounds = new OpenLayers.Bounds(-122.1655, 42.9507, -122.1077, 43.008); > > I need the four lat/lon corners to be exactly these numbers at a certain > zoom level. What would I set as the resolution in the resolution array to > get this? > > My resolution array is the following: > > var layerResolutions = > [0.703125,0.17578125,0.0439453125,0.0054931640625,0.0006866455078125, > 0.00017 > 1661376953125,0.0000858306884765625,0.00004291534423828125, > 0.000021457672119 > 140625,0.000010728836059570312]; > > Thanks in advance, > > Linda Rawson > > >
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