Pst - Andrea. Why not make a GeoServer blog entry out of this - and get
the issue into a wider area of discourse. At least place it on osgeo
discuss email list.
Cheers,
Jody
> 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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