[MapServer-users] Inconsistent support for template substitution

[Andrew Harfoot]

Hi Seth,

Thanks for checking that, I see what you mean. I'll submit a pull 
request to correct the logic.

Cheers,

Andy

On 19/10/2023 16:26, Seth G wrote:
> *CAUTION:* This e-mail originated outside the University of Southampton.
> Hi,
>
> This seems like a bug - there is a check to see if the Map projection 
> is a geographic coordinate system [1], and if it is then it skips all 
> the [maplon], [maplat], [minlon] etc. substitutions. If it is in 
> another projection then the point and extent are reprojected to latlon 
> and included in the template.
>
> Seth
>
>
> [1] 
> https://github.com/MapServer/MapServer/blob/main/src/maptemplate.c#L4273
>
> --
> web:https://geographika.net & https://mapserverstudio.net
> twitter: @geographika
>
> On Thu, Oct 19, 2023, at 3:50 PM, Andrew Harfoot via MapServer-users 
> wrote:
>>
>> Hi list,
>>
>> I am setting up a WMS server using Mapserver 7.6.2 and want to return 
>> a html response to a GetFeatureInfo request where the response 
>> contains the coordinates of the GFI click. The WMS supports multiple 
>> coordinate systems, so ideally I'd like to have the coordinates in a 
>> CRS that I can predetermine.
>>
>> I have a test template file as follows:
>>
>> <!-- MapServer Template -->
>> <p>
>> Map X/Y : [mapx],[mapy]<br>
>> Map LL : [maplon],[maplat]
>> </p>
>>
>> If I configure an 'old style' TEMPLATE in the map file, directly 
>> referencing the html template as follows:
>>
>> LAYER
>>    TEMPLATE "coord_comp.html"
>>
>> With a GFI request specifying a CRS of EPSG:27700:
>>
>> ...&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetFeatureInfo
>>    &BBOX=379766.9556955648586154,58602.32640402266406454,405538.15569556411355734,94300.79913129436317831
>>    &CRS=EPSG:27700&WIDTH=649&HEIGHT=899&LAYERS=test&STYLES=&FORMAT=image/jpeg&QUERY_LAYERS=test
>>    &INFO_FORMAT=text/html&I=268&J=647&FEATURE_COUNT=50
>>
>>
>> the output of is as follows:
>>
>> Map X/Y : 390428.846605,68589.162768
>> Map LL : 50.516415,-2.135015
>>
>> When a similar requests are made specifying a CRS of EPSG:4326:
>>
>> ...&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetFeatureInfo
>>    &BBOX=50.33460688675980776,-2.28814701603231718,50.84060858090575863,-1.92285769511938809
>>    &CRS=EPSG:4326&WIDTH=649&HEIGHT=899&LAYERS=test&STYLES=&FORMAT=image/jpeg&QUERY_LAYERS=test
>>    &INFO_FORMAT=text/html&I=298&J=579&FEATURE_COUNT=50
>>
>> the output is as follows:
>>
>>
>> Map X/Y : 50.514437,-2.120136
>> Map LL : [maplon],[maplat]
>>
>> The maplat and maplon templates are not substituted.
>>
>> Mapserver has been compiled with PROJ support and a PROJECTION has 
>> been defined for the layer in the map file.
>>
>> The CRS of the source data is EPSG:27700
>>
>> I was hoping that the maplat and maplon templates would provide me 
>> with a consistent source of coordinate information, independent of 
>> the request CRS. Can anybody shed any light on the observed behaviour?
>>
>> Thanks,
>>
>> Andy
>>
>> -- 
>> Andy Harfoot
>>
>> Skype: gdi_ajph
>> Teams:ajph at soton.ac.uk  <mailto:ajph at soton.ac.uk>
>> Phone: +44 2380 590566
>>
>> GeoData Institute
>> University of Southampton
>> Southampton
>> SO17 1BJ
>>
>> www.geodata.soton.ac.uk  <http://www.geodata.soton.ac.uk>
>> _______________________________________________
>> MapServer-users mailing list
>> MapServer-users at lists.osgeo.org
>> https://lists.osgeo.org/mailman/listinfo/mapserver-users
>>
>

-- 
Andy Harfoot

Skype: gdi_ajph
Teams:ajph at soton.ac.uk
Phone: +44 2380 590566

GeoData Institute
University of Southampton
Southampton
SO17 1BJ

www.geodata.soton.ac.uk
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