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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>GetFeatureInfo is not so much ambiguous as
it is loosely defined. It’s purpose is to provide <i><span style='font-style:
italic'>supplemental</span></i> information on features at a certain location
in the raster. In short, it’s “hey server, what feature is that at <i><span
style='font-style:italic'>pixel</span></i> x,y of the map just asked for with
these parameters?” (As such, it’s not a substitute for a WFS, which gives you
raw, unrendered features as opposed to a pretty picture.) It’s often used for
roll-over effects such as “tool tips” or some other status display.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The ambiguity/loosely defined nature comes
from what you can get back; the specification doesn’t limit the format to
anything specific, leaving it up to the server to advertise the response
formats it supports. A server might offer plain text or HTML with some human-readable
text, or some XML that might contain more detailed machine-readable feature
information, or anything else… that’s left to the implementation to decide, and
to the client to pick. Not necessarily the height of interoperability, but
workable solutions can be made from this.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Key to the understanding is that it usually
follows a GetMap request, and is framed in terms of that previous request. In
fact, most of the arguments of GetFeatureInfo are exactly the same as GetMap;
that helps the server reconstruct the “image” (figuratively, if not literally)
to determine what part of the map you’re requesting feature info for: the X,Y
are, after all, expressed in pixel units, not geospatial coordinates.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>And yes, MapGuide does support
GetFeatureInfo, though it can be configured away wholesale in the templates, or
on a layer-by-layer basis (that’s the purpose of the “queryable” attribute.) The
templates also allow you to define your own text-based response “format”, if
you’re so inclined. If memory serves, text/plain and text/html come for free
out of the box.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>- Thomas<o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
mapguide-users-bounces@lists.osgeo.org
[mailto:mapguide-users-bounces@lists.osgeo.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Jason Birch<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, March 01, 2007
9:00 AM<br>
<b><span style='font-weight:bold'>To:</span></b> MapGuide Users Mail List<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-users] How
to deal with data served by ArcIMS with WMS</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>WMS has a rather ambiguous interface
called "GetFeatureInfo". I don't believe that this is supported
within MapGuide though, so anything you did with this would have to be custom
code.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>As Andy suggests, WFS would give you
better access to the features, but I haven't done this myself either.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Jason</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
mapguide-users-bounces@lists.osgeo.org
[mailto:mapguide-users-bounces@lists.osgeo.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Ismael Cams<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, March 01, 2007
06:48<br>
<b><span style='font-weight:bold'>To:</span></b> mapguide-users@lists.osgeo.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [mapguide-users] How to
deal with data served by ArcIMS with WMS</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hello,<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I am completely new to WMS and hope someone can give me some more
information about following concern. <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>In our case the WMS will be served by an ArcIMS. Will it be possible to
use the data in the same way as it can be done with other resources (shp,
sdf, ...). Is it for example possible to select a feature and get the
properties of this feature ? Can the Webextensions API used as it was sdf/shp
resource in the repository ? <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>If not what are the limitations ?<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Thanks in advance.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Kind regards,<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Ismaël<o:p></o:p></span></font></p>
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