[mapserver-users] Mapserver projection, auto and extent

[Trygve Aspenes]

Thanks Jeff

I have used the build in network logger available in new versions of 
QGIS ( I think you can activate it by pressing F12) a lot. That has been 
essential for me to understand whats going on, especially when I was 
debugging time dimension in some other setup.

I revisited the wms-server doc you suggested and from that I added UNITS 
DD, and after that it seems to work. But the catch is I really don't 
understand why. But I guess mapserver needs to know the units of the 
original extent when requesting various other projections.

And I love the 'AUTO' as I have tens of thousands of images, all with 
different projection! So even if it will cost me my sanity i think I 
will go with that :-)

Trygve

Den 2022-05-19 16:10, skrev Jeff McKenna:
> Hi Trygve,
> 
> You can examine the problem QGIS GetMap request closely, through the
> Network Logger (it's really a saviour)
> https://github.com/mapserver/mapserver/wiki/Get-the-Raw-WMS-Request-Generated-by-QGIS
> 
> Then you can go back to review the trusty WMS Server document, and
> make sure you have set the required metadata:
> https://mapserver.org/ogc/wms_server.html
> 
> (which also means to remove all warnings from your GetCapabilities 
> response)
> 
> But that QGIS network logger is your lifeline :)
> 
> Hope that gets you started,
> 
> PS. I never use 'auto', ever, never, it's my own rule and that's how I
> keep my sanity and avoid these issues, ha.  But others like it.  I
> only speak for myself here.
> 
> -jeff
> 
> 
> 
> --
> Jeff McKenna
> GatewayGeo: Developers of MS4W, MapServer Consulting and Training
> co-founder of FOSS4G
> http://gatewaygeo.com/
> 
> 
> 
> On 2022-05-19 10:26 a.m., Trygve Aspenes wrote:
>> Hi
>> 
>> I got a geotiff raster with a projection which is not an EPSG code, so 
>> in the mapfile I use AUTO in the layer projection. This also means I 
>> skip the extent and projection in map level in the mapfile. In one 
>> client this works fine ( this client request epsg:3857 and this looks 
>> fine to me)
>> 
>> But in QGIS, this does not work nor any other projections.
>> 
>> Then I add EXTENT and PROJECTION in my mapfile like this:
>> MAP
>> ....
>>    EXTENT -56.6378419 31.5007307 95.025531 84.6828537
>>    PROJECTION
>>      "init=epsg:4326"
>>    END
>> ....
>> END
>> 
>> And then EPSG:4326 works in QGIS also. But if I try to change the 
>> projection i qgis, eg to EPSG:3857, this does not work in QGIS, even 
>> if it still work in my other client.
>> 
>> So what is it that I don't understand about EXTENT and PROJECTION. I 
>> have looked at the documentation 
>> https://mapserver.org/mapfile/projection.html#important-notes and and 
>> as far as I can understand from the second bullet point the projection 
>> definition at map level can be looked as the outgoing projection with 
>> the extent accordingly.
>> 
>> What do I need to do to make QGIS be able to use other projections as 
>> well?
>> 
>> I do have a link to my getcapabilities document, but hesitates to put 
>> it here.
>> 
>> Trygve Aspenes
> 
> 
> 
> 
> _______________________________________________
> MapServer-users mailing list
> MapServer-users at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/mapserver-users