Jesse Eichar ha scritto:
> I've been using SLD 1.0 page 26 for the basis of my research. But
> I'd like to look at map server as well since it is one of the big Web
> Map Servers out there. If their calculation fits into the spec it
> would be nice to align with them as much as possible. I personally
> would like to see the scale be calculated based on the
> specification. As you know I am primarily a client developer and
> having to special case for each server is a real pain.
>
> With regard to projection deformations. Lets see if mapserver does
> that if not then I wouldn't worry about it either. (at least if it
> is more work).
Oh, had a look at OpenLayers too, here the answer is:
OpenLayers.INCHES_PER_UNIT = {
'inches': 1.0,
'ft': 12.0,
'mi': 63360.0,
'm': 39.3701,
'km': 39370.1,
'dd': 4374754
};
OpenLayers.INCHES_PER_UNIT["in"]= OpenLayers.INCHES_PER_UNIT.inches;
OpenLayers.INCHES_PER_UNIT["degrees"] = OpenLayers.INCHES_PER_UNIT.dd;
/** A sensible default
* @type int */
OpenLayers.DOTS_PER_INCH = 72;
OpenLayers.Util.getScaleFromResolution = function (resolution, units) {
if (units == null) {
units = "degrees";
}
var scale = resolution * OpenLayers.INCHES_PER_UNIT[units] *
OpenLayers.DOTS_PER_INCH;
return scale;
};
where resolution is, afaik, the image width / bounds width (but I'm not
sure).
Cheers
Andrea
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