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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m just passing along some findings in the hopes that
if anyone is aware that my workaround will cause other problems they’ll
let me know.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>In the Locate widget, the lines that use the following code:
ms_newprojectionobj ($szTmpMapProj);</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>where $szTmpMapProj was returned by $oMap->getProjection
(); returns an error when the projection returned from $oMap is a custom
projection.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>My application’s map has a custom projection. When I
use the Locate widget and try to zoom in, for example, to a selected location I
get an error “</span></font>msProcessProjection(): unknown projection id”.<font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> The problem
turned out to be that the string returned by the Map’s getProjection()
could not be used as input to instantiate a new projection object with ms_newprojectionobj().</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>In my application, after:</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>$szTmpMapProj = $oMap->getProjection ();</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>$szTmpMapProj holds the string “proj=lcc +lat_0=0
+lat_1=49 +lat_2=77 +lon_0=-91.8666 +datum=NAD83”</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The ms_newprojectionobj() function expects commas between each
of the projection definition items in the string it is passed. So, to get
around the problem, I inserted a line of code to replace the spaces between all
the parameters with commas, like this:</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> $szTmpMapProj = $oMap->getProjection ();</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> $szTmpMapProj = str_replace(" ",
",", $szTmpMapProj);</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> :</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> $projOutObj = ms_newprojectionobj ($szTmpMapProj);</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>And it worked. This won’t affect any returned epsg
projections, but will if affect some other type of returned projection? </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m not certain if this would be considered a MapServer
problem or a Chameleon problem (that the returned string from getProjection()
cannot then be used to create a new projection object). It is certainly
possible (and I have no idea) that the string returned by getProjection() CAN
be used as it is returned for a custom projection when it is passed to some other
function. In that case, fixing the returned string to include the commas would
simply break something else. Certainly this is a problem in Chameleon’s
Locate widget if the map has a custom projection.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Cheers,</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>jtm</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Joanne T. McGraw<br>
Spatial Data Visualization Specialist / Spécialiste en visualisation des
données spatiales<br>
Agriculture and </span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Agri-Food</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> </span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>Canada</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> /
Agriculture et Agroalimentaire </span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Canada</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><br>
Telephone/Téléphone: (613) 759-6103<br>
Facsimile/Télécopieur: (613) 759-1937<br>
</span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>960 Carling Ave, #1136</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><br>
</span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>Ottawa</span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>, </span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Ontario</span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><br>
K1A 0C6</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><a href="mailto:mcgrawj@agr.gc.ca">mcgrawj@agr.gc.ca</a></span></font></p>
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12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><img border=0 width=278 height=24
src="cid:image001.jpg@01C5A273.1CD7A340"
alt="Agriculture and Agri-Food Canada - Agriculture et Agroalimentaire Canada"></span></font></p>
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12.0pt'> </span></font></p>
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