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

Thu Sep 18 05:08:38 EDT 2003

Hi Debbie,

thanx for your affirmation that PHP/MapScript _is_ used for such
operations. I've already experimented with a php as a wms-server and I
created a low-level prototype which at least can deliver an image, so
far it doesn't react on any url-commands like wms-request.

But I didn't thought this would be very clever to do, since I would have
to wrap all functions the mapserv-cgi provides and loop them through -
e.g. the GetCapabilities you mentioned.

And before doing this, I want to be very sure that there _isn't_ any
other let's call it "more elegant  way" with less "do-it-yourself" to
implement dynamic layers. So if anybody knows an alternative solution,
please let me know.

Debbie, if you like to share your code, I'm _very_ interested, I don't
want to reinvent the wheel. ;-) Any modifications or extensions would of
course be "shared back".

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: Wednesday, September 17, 2003 9:37 PM
>To: Tom.Kralidis at CCRS.NRCan.gc.ca; mapserver-users at lists.gis.umn.edu;
>Frieso ter Haseborg
>Subject: RE: [Mapserver-users] OGC-compliant WMS-server
>deliveringdynamiclayers with MS?
>
>
>
>Hi Tom,
>there isn't an API/class for OGC specs that I know of but I'm sure
>someone out there could make one - good project.
>
>I simply made a 'process' function that went through the name/value
>pairs of the OGC compliant URL to extract what I needed to create the
>mapfile and produce the desired image.  The script also has a 
>section to
>respond to the 'request' parameter - either GetMap, GetCapabilities, or
>GetFeatureInfo.
>
>I'm willing to share code if you want it - just let me know and give me
>a chance to clean it up a little.
>
>Debbie
>
>
>>>> <Tom.Kralidis at CCRS.NRCan.gc.ca> 09/17/03 03:17PM >>>
>
>Debbie,
>
>Thanks for the info.  This is something that I've been interested in
>for
>some time, that is providing WMS for real-time data (earthquakes,
>sensor
>readings, etc.) which is not necesarily available through the mapserv
>CGI
>WMS interface.
>
>Does PHP/Mapscript provide an API/class for OGC specifications?
>
>Thanks
>
>..Tom
>
>=================================
>Tom Kralidis
>Systems Scientist
>Canada Centre for Remote Sensing
>Tel: +01-613-947-1828
>http://www.cgdi.ca/ 
>=================================
>
>> -----Original Message-----
>> From: Debbie Pagurek [mailto:pagurekd at agr.gc.ca] 
>> Sent: Wednesday, September 17, 2003 1:44 PM
>> To: mapserver-users at lists.gis.umn.edu;
>ter-haseborg at sf-datentechnik.de 
>> Subject: Re: [Mapserver-users] OGC-compliant WMS-server delivering
>> dynamic layers with MS?
>> 
>> 
>> It is definitely possible to create a WMS service that can access
>> lat/long fields from a database.  We are using PHP/Mapscript 
>> to do this.
>>  The php script looks at the name/value pairs in the request 
>> and returns
>> an image.
>> 
>> For example, in the example below, we are passing the name of a
>given
>> taxon as the Layer name (Cyanocitta cristata).  The php script then
>> creates a mapfile on the fly, retrieves the Cyanocitta cristata
>points
>> from the database, adds the lat/long coordinates as feature 
>> (POINTS) to
>> the map, creates an image in the format specified in the url request,
>
>> and then returns the image
>>   $theheader="Location: http://thehost".$image_url;
>>     Header($theheader);
>> 
>> http://wms1.agr.gc.ca/mapdata/itis/testscript.php?VERSION=1.1.
>> 0&REQUEST=GetMap&Layers=Cyanocitta%20cristata&SRS=EPSG:42304&B
>> BOX=-2750560,-936638,3583870,4673120&WIDTH=339&HEIGHT=300&FORM
>> AT=image/png
>> 
>> The one problem we have had with this application is the
>> GetCapabilities.  We have over 100,000 taxa available for mapping,
>but
>> we don't want to generate such a large getcapabilities document that
>> lists the each taxon as a layer.  So instead we have a 'dummy'
>> getcapabilities document that is returned from
>> http://wms1.agr.gc.ca/mapdata/itis/testscript.php?VERSION=1.0.
>> 0&REQUEST=GetCapabilities
>>  This document provides instructions on how to formulate the getmap
>> request e.g. Layers=Abudefduf or Layers=Cyanocitta cristata.
>> 
>> Some of the WMS viewers that are available out there on the internet
>> seem to automatically go to the getCapabilities request, even if you
>> enter a getmap request.  Because of that, there has been some 
>> difficulty
>> using our WMS in some online mapping applications.  That being said,
>> however, it is very easy to use our getmap requests in Web Map
>Context
>> documents that can combine the point distribution maps on top of
>other
>> layers.  These web map context documents can be that can be 
>> loaded into
>> applications that handle those types of documents..
>> 
>> Good luck with your work!
>> Debbie Pagurek
>> 
>> 
>> >>> "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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