Hi Jackie
i got this from openlayers code
var scale = resolution * OpenLayers.INCHES_PER_UNIT[units] *
OpenLayers.DOTS_PER_INCH;
OpenLayers.INCHES_PER_UNIT = {
'inches': 1.0,
'ft': 12.0,
'mi': 63360.0,
'm': 39.3701,
'km': 39370.1,
'dd': 4374754,
'yd': 36
};
OpenLayers.DOTS_PER_INCH = 72;
or the reverse
resolution = 1 / (normScale * OpenLayers.INCHES_PER_UNIT[units]
* OpenLayers.DOTS_PER_INCH);
--
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