So much for writing a client :P. So since there doesn't seem to be a
defacto standard between the other servers I suggest that we make our
implementation as close to the spec as we can. And Jody's suggestion
about a blog isn't a bad one. I don't expect that we can embarrass
mapserver into fixing their scale calculation but we should at least
try.
Jesse
On 30-Jan-07, at 6:19 AM, Andrea Aime wrote:
> 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
-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys - and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
Geotools-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/geotools-devel
