[MapServer-users] Inconsistent support for template substitution

[Andrew Harfoot]

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
Phone: +44 2380 590566

GeoData Institute
University of Southampton
Southampton
SO17 1BJ

www.geodata.soton.ac.uk
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