[josm-dev] Problems creating TileSource for ArcGIS REST API

[Ian Dees]

Use bboxSR=4326 (to specify the bounding box in 4326) and imageSR=102113 to
get the image back projected to Spherical Mercator.

The imageSR parameter may be called something else, but I do know that an
output projection option exists somewhere.

On Thu, Feb 17, 2011 at 2:09 PM, Josh Doe <josh at joshdoe.com> wrote:

> Ian,
> I've tried various combinations of spatial references and haven't
> quite got it working. I use the tileYToLat/tileXToLon functions which
> give me decimal degrees in WGS84 (EPSG:4326), so I can't use
> bboxSR=102113 without converting those coordinates. With the Proj4J
> plugin I used EPSG:3857 (equivalent to ESRI:102113 and ESRI:102100),
> and that eliminates the gaps but now there are slight shifts between
> each tile, so clearly something is still awry. I thought setting
> imageSR=102113 would fix the slight shifts, but then I don't get any
> image returned.
>
> Tobias,
> I've found it very confusing to understand what spherical mercator is
> and the various codes involved, so much so that I created a wiki page
> on EPSG:3857 [1].
>
> All,
> One thing that bothers me in JOSM is the Mercator projection claims to
> be EPSG:3857, however it gives values in radians, not meters which
> EPSG:3857 uses. I'm not even sure what EPSG/ESRI/etc identifier
> corresponds to to this, but I think we should change it to avoid
> confusion (took me a while to realize it was "wrong").
>
> Shouldn't we change this code to avoid confusion and to "be right"?
> I'm guessing people use the projection, so we shouldn't "fix" it but
> rather give it the correct code if we can find it or invent one,
> probably via SpatialReference.org.
>
> Thanks,
> -Josh
>
> [1]: http://wiki.openstreetmap.org/wiki/EPSG:3857
>
> On Thu, Feb 17, 2011 at 12:35 PM, Tobias Wendorff
> <tobias.wendorff at tu-dortmund.de> wrote:
> > Am 17.02.2011 17:15, schrieb Ian Dees:
> >>
> >> Don't reproject your coordinates to Virginia, just tell ArcGIS that your
> >> request bounding box is in Spherical Mercator projection by passing in a
> >> projection id of 102113.
> >
> > Interesting information on this topic:
> > http://forums.esri.com/Thread.asp?c=93&f=984&t=288073&g=1
> >
>