[OpenLayers-Users] reprojection issue

[Nicholas Efremov-Kendall]

Hi Jan,

Unless I am very much mistaken, http://www.dmap.co.uk/utmworld.htm shows
Tunisia to be squarely in UTM 32 N. I have ArcGIS and my landsatt data for
the region all fall into UTM 32 N, which is why I believe this is in fact
the case.


UTM Zone 32 N is also EPSG:32632

http://spatialreference.org/ref/epsg/32632/ so I still don't know what going
on.

UTM coordinates are arbitrary cartesian points, which basically could end up
anywhere which is why the UTM zone is needed for the origin. The only thing
I can think is that yes, there is some issue with the projection, but I
don't know what.

On Wed, Jun 10, 2009 at 12:38 PM, Jan Martin <janmartin3 at googlemail.com>wrote:

> Hi Nicholas,
>
> your assumption regarding your source UTM Zone beeing UTM 32N is wrong.
>
> Your coordinates are from Tunisia. And Tunisia is UTM 32S, not UTM 32N:
> http://upload.wikimedia.org/wikipedia/commons/8/85/LA2-Africa-UTM-zones.png
>
> But as you can see here EPSG:32632 is the right result of a conversion from
> UTM Zone 32S to EPSG:
> http://spatialreference.org/ref/epsg/?search=32632&srtext=Search
>
> Question remains why your coordinates from Tunisia are displayed in
> Algeria.
>
> I wonder if it is OK to just use EPSG:32632 as a projection for your data,
> or if one would have to do math on the coordinates to.
> After all your coordinates have been recorded in *WGS84, UTM 32S.*
>
> Jan
>
> On Wed, Jun 10, 2009 at 6:08 PM, Nicholas Efremov-Kendall <
> n.e.kendall at gmail.com> wrote:
>
>>
>> Hello all,
>>
>> I believe this is more of a gis question, than for OpenLayers, but the
>> problem manifests itself in openlayers and I'm having some trouble
>> diagnosing it. Jan provided me with some very helpful assistance, which led
>> me to the conclusion that my projection was wrong. I'm trying to display gps
>> point originally recorded in UTM 32N. I had mistakenly believed this was
>> EPSG 22332, but 36232 is actually what I was going for. My problem is this:
>> I have the points overlaid on a wms server (thanks to Jan) but they're in
>> the wrong spot. However, when I change the EPSG code, the points don't move.
>> Does anyone have a suggestion for why they don't move? and or for how to
>> crack this nut.
>> best,
>> Nick
>>
>>
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>>
>
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