[Mapserver-users] OGC-compliant WMS-server deliveringdynamic layers with MS?

Wed Oct 15 09:02:19 PDT 2003

> -----Original Message-----
> From: Debbie Pagurek [mailto:pagurekd at agr.gc.ca]
> Sent: Wednesday, October 15, 2003 10:42 AM
> To: ter-haseborg at sf-datentechnik.de
> Cc: mapserver-users at lists.gis.umn.edu
> Subject: RE: [Mapserver-users] OGC-compliant WMS-server
> deliveringdynamic layers with MS?
> 
> 
> Hi,
> and thanks for pointing out that the url for the getfeatureinfo was
> pointing to an internal server.  Here's what the application points to
> now:
> http://sis.agr.gc.ca/pls/bb/bcin%5FspeCs%2Ecoord?p%5Flat=20.63
> 33&p%5Flong=-156.433&p%5Ftaxon=Abudefduf
> abdominalis 
> 
> And to answer your question, yes, it seems you've caught me - this
> getfeatureinfo request does not seem to be ogc-compliant and 
> instead we
> did something to fit our own application so that some meaningful
> information was returned to the user.  
> 
> I guess a true getfeatureinfo response would be either a text 
> dump or a
> gml dump that would just list the point coordinate information?  That
> part of the code  could easily be changed... if you do it, 
> please share
> the code with us!
> 

GetFeatureInfo is an optional operation of an OGC WMS.  Having said this,
text/html is an allowed MIME type of GetFeatureInfo when implemented.  Also,
there is no standard schema to GetFeatureInfo responses, so Debbie's
approach to the respnse is okay.

..Tom

> Debbie
> 
> 
> 
> 
> >>> "Frieso ter Haseborg" <ter-haseborg at sf-datentechnik.de> 10/15/03
> 09:38AM >>>
> Hi Debbie,
> 
> first of all thanks a lot for posting your code - yes, it's been a
> great
> help bringing some light how to handle these things.
> 
> One more question - if you will excuse me.
> The solution to handle GetMap and GetCapabilities are understood in
> particular the idea to create a new mapfile and to let mapserver do
> the
> xml-generation for GetCapabilities seems clever to me.
> 
> But I've still a question regarding the getFeatureInfo-Request.
> Instead
> of returning the direct output you dump an url. What would be the
> result
> on executing this url? I can't test this, since the url I get on
> trying
> your demo-link leads to an unaccessible server. Would the other serve
> deliver the desired output? 
> 
> Would MS be able to handle this reroute if an url is dumped instead of
> a
> result in the info_format normally specified with a
> getFeatureInfo-Request?
> Or in other words: This isn't ogc-compliant (no offense!), is it?
> 
> TIA,
>  
> Frieso ter Haseborg
> - Software Development - 
>  
> --
> 
> -------------------------------------------------- 
> S&F Datentechnik GmbH&Co.KG 
> Reimersstr. 41b 
> 26789 Leer, Germany
> 
> 
> >-----Original Message-----
> >From: Debbie Pagurek [mailto:pagurekd at agr.gc.ca] 
> >Sent: Monday, September 29, 2003 8:37 PM
> >To: mapserver-users at lists.gis.umn.edu; Frieso ter Haseborg
> >Cc: Tom.Kralidis at CCRS.NRCan.gc.ca 
> >Subject: Re: [Mapserver-users] OGC-compliant WMS-server
> >deliveringdynamic layers with MS?
> >
> >
> >
> >OK everybody,
> >I've attached the PHP code that I wrote for handling the WMS requests
> >to our Integrated Taxonomic Information System internet mapping
> >application.
> >
> >I have removed most of the code that shows that transfer of the point
> >information via XML to the application, because the points can 
> >come from
> >anywhere:  XML, a direct database connection, or a shapefile.  
> >
> >The point of interest here is how the WMS request name/value pairs
> are
> >handled in PHP and how the corresponding results are returned (an
> image
> >for a getmap request,  an xml stream for the getcapabilities request,
> a
> >pop up window with a new URL for a getfeatureinfo request).
> >
> >I tried to include all possible name/value pairs that can come in via
> a
> >WMS request but I think I missed some e.g. EXCEPTIONS=
> >
> >I am no programming guru so please forgive any weird programming
> >foibles in here.  All I know is that the application does WORK! 
> >Hopefully some of you will find this useful in some way.  Please let
> me
> >know if you have found it helpful or if you see any problems.
> >
> >Keep in mind that the GetCapabilities for this application was a
> >problem because we are mapping over 100,000 taxa, and it is
> ridiculous
> >to include that many layers in a getcapabilities document.  In the
> >getcapabilities section I included a default (no layer name is 
> >specified
> >in the request) as well as a dynamic response that writes out a new
> >mapfile if a layername is specified (e.g.
> >request=getcapabilites&layers=Abudefduf)
> >
> >An example of the type of requests that are handled by this script:
> >Getmap:
> >http://wms1.agr.gc.ca/mapdata/itis/testscript.php?VERSION=1.1.0 
> >&REQUEST=GetMap&Layers=Cyanocit
> ta%20cristata&SRS=EPSG:42304&BBO
> >X=-2750560,-936638,3583870,4673120&WIDTH=339&HEIGHT=300
> >
> >GetFeatureInfo:
> >http://wms1.agr.gc.ca/mapdata/itis/testscript.php?VERSION=1.1.0 
> >&REQUEST=GetFeatureInfo&QUERY_LAYERS=Abudefduf+abdominalis&Laye
> >r=Abudefduf+abdominalis&X=250&Y=150
> >
> >GetCapabilities:
> >http://wms1.agr.gc.ca/mapdata/itis/testscript.php?VERSION=1.0.0 
> >&REQUEST=GetCapabilities
> >
> >I am no programming guru so please forgive any weird programming
> >idiosyncrasies in here.  All I know is that the application 
> does WORK!
> 
> >Hopefully some of you will find this useful in some way.  Please let
> me
> >know if you have found it helpful or if you see any problems.
> >
> >Debbie Pagurek
> > 
> >
> >Debbie Pagurek, M.Sc.
> >GIS and Remote Sensing Analyst / Télédétection, SIG
> >Research Branch / D.G. Recherche
> >Agriculture and Agri-Food Canada / Agriculture et Agroalimentaire
> >Canada
> >Telephone / Téléphone: 613-759-1543
> >Facsimile / Télécopieur: 613-759-1937
> >960 Carling Avenue
> >Ottawa, Ontario
> >K1A 0C6
> >pagurekd at agr.gc.ca 
> >
> >>>> "Frieso ter Haseborg" <ter-haseborg at sf-datentechnik.de> 09/17/03
> >11:56AM >>>
> >Hi,
> >
> >I'm searching for possibilities to use MS for building an
> >OGC-compliant
> >WMS-service which creates and serves dynamic layers from data out of
> >RDBMS. These RDBMS do NOT have any spatial-extensions it's just the
> >"x,y-coordinate & label-data"-thing. 
> >
> >So what I want to do: retrieve the coordinates from my databases and
> >create one or more dynamic layers. I did some experiments with
> >PHP/MapScript, no major problems so far, that seems to be the easier
> >part.
> >
> >The problem comes here: I don't want to create these layers in any
> >client-app, I want to have these layers served by the mapserver,
> since
> >I
> >have to incorporate other servers e.g. ArcIMS which have to use and
> >process this layers through OGC-requests. Any ideas?
> >
> >Are there any possibilities to create dynamic layers from RDBMS e.g.
> >Sybase ASA, MS SQL Server, Oracle without spatial-extensions I
> >overlooked, besides doing this in PHP/MapScript?
> >
> >Are there any hooks or entry-points in the mapserv-cgi to process
> >customized-operations like creating the mentioned dynamic layers?
> >
> >Any comment and hint would be appreciated!
> >
> >TIA,
> > 
> >Frieso ter Haseborg
> >- Software Development - 
> > 
> >--
> >
> >-------------------------------------------------- 
> >S&F Datentechnik GmbH&Co.KG 
> >Reimersstr
> >. 41b 
> >26789 Leer, Germany
> >
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> >
> 
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