[mapserver-dev] Calculate Bounding Box...

[Oscar Fdez.]

Thanks so much to all for help.

Regards, Oscar.



2009/3/12 Dan Little <danlittle at yahoo.com>

> I'm thinking the most accurate way to do it is to use a projection that
> supports miles that is close to your current extent...  or  use something
> crappy like Mercator.
>
> This code is off the top of my head, without looking at any docs... so bear
> with me if there are errors.
>
> $latlon = ms_newProjectionObj("proj=EPSG:4230"); # IIRC
> $proj = ms_newProjectionObj("proj=EPSG:3758"); # Popular Web-mapping
> projection
>
> $centerPoint = ms_newPointObj($x, $y); # in lat long
>
> $centerPoint->project($latlon, $proj);
>
> $minPoint = ms_newPointObj();
> $maxPoint = ms_newPointObj();
>
> $mInM = 1609; # mile in meters, as 3758 is in meters
> $minPoint->setXY($centerPoint.x - $mInM, $centerPoint.y - $mInM);
> $maxPoint->setXY($centerPoint.x + $mInM, $centerPoint.y + $mInM);
>
> $minPoint->project($proj, $latlon);
> $maxPoint->project($proj, $latlon);
>
> return
> implode(',',array($minPoint->x,$minPoint->y,$maxPoint->x,$maxPoint->y));
>
>
>
>
> ------------------------------
> *From:* Oscar Fdez. <ofarcis at gmail.com>
> *To:* mapserver-dev at lists.osgeo.org
> *Sent:* Wednesday, March 11, 2009 11:53:26 PM
> *Subject:* [mapserver-dev] Calculate Bounding Box...
>
>  Hi to all,
>
> Any people know how to calculate the bounding box from lon/lat coordinates.
>
> An example:
>
> I have a point in -8.0572,42.4702 (lon/lan). I like a bounding box arround
> 1 mile of this site. Can use any SRS like EPSG:4230 or another.
>
> Any solution is accepted independent of language. I translate to my need. I
> hope develop in php mapscript, but the solution can made in any language…
>
>
>
> Thanks for all,
>
> Oscar.
>
>
>
>
>
>
>
>
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