Cameron, Not sure about that. We do not have a use case for it. To handle the situation in a WFS, you need to have a WFS that supports complex features. For instance, you would have a table for the object, its meta-data and current position, a related table with previous positions of that object. The WFS can then return the information properly using the appropriate XPath query. So this is already covered by the spec. I believe that GeoServer was supposed to have that functionality built-in.... (we had to write our own)
Pat G. Cappelaere Vightel Corporation www.vightel.com blog.geobliki.com Cell: 410.340.4868 Bus: 443.283.0369 Fax: 443.283.0370 > From: Cameron Shorter <[EMAIL PROTECTED]> > Date: Tue, 05 Jun 2007 08:39:10 +1000 > To: "Diez, Matthew" <[EMAIL PROTECTED]> > Cc: Christopher Hunt <[EMAIL PROTECTED]>, Patrice Cappelaere > <[EMAIL PROTECTED]>, Linda Derezinski <[EMAIL PROTECTED]> > Subject: Re: How to use time series WFS > > Pat, > What about SensorWeb or maybe GeoRSS as a format for pushing vehicle > track data? > Is that suitable? > > Diez, Matthew wrote: >> Every problem seems to come with its own intricacies, no? >> >> First off, TimeSeries assumes timesteps, which are probably better >> referred to >> as 'frames', in the context of animation. >> >> When doing what we do (which is to say, displaying the motion of a >> chemical plume over time) >> we break it up into constituent timesteps, and then send the timestep >> list back as part >> of the context document. This actually works reasonably well, and we >> force reloads (due >> to an applet that pushes new plume events to the client). >> >> What Christopher is referring to will definitely require custom-writing >> the SQL (or whatever >> Language) query is necessary to generated, and sending back the GML >> accordingly. >> >> Unfortunately, I cannot speak to "MovingObjectStatus", as I have never >> implemented that myself. >> >> But, like Christopher said, WFS is probably not the best way to get this >> info, rather, do a custom >> query and send the "valid" timesteps back in the context doc, and make >> the client aware of what timesteps >> it may make WMS (of WFS, eventually) calls for. >> >> >> Matthew D. Diez >> >> -----Original Message----- >> From: Cameron Shorter [mailto:[EMAIL PROTECTED] >> Sent: Monday, June 04, 2007 3:56 PM >> To: Christopher Hunt; Diez, Matthew; Patrice Cappelaere; Linda >> Derezinski >> Subject: Re: How to use time series WFS >> >> Matt, Pat, Linda, >> You have all been involved in time series Mapbuilder and I'm hoping will >> be able to give Christopher some advice. >> >> Christopher wants to track air planes (domestic) and possibly other >> vehicles and would like to set up a server to present the data using a >> standards based interface. >> >> How do you suggest he does this? >> >> Christopher Hunt wrote: >> >>> Hi Cameron, >>> >>> I'm hoping that you can provide me with a little guidance re. WFS. I'm >>> >> >> >>> starting to feel like I'm barking up the wrong tree! >>> >>> As per your advice I've been looking closely at Mapserver. I've also >>> been looking at Geoserver. Both of these, or may be it is WFS itself, >>> tends to ignore child elements of a feature such as a >>> >> MovingObjectStatus. >> >>> As an example, if I want to track observations of a feature using >>> GML's MovingObjectStatus then I'd like to express to WFS something >>> >> like: >> >>> "For a given feature collection, return all dynamic features and >>> moving object status where the valid time of moving object status is >>> within a certain time period" >>> >>> To do this using WFS does not seem possible given that we're talking >>> about MovingObjectStatus and not their parent features. Would you >>> concur with this? >>> >>> Thanks for any help. >>> >>> Cheers, >>> -C >>> >>> >> >> >> -- >> Cameron Shorter >> Systems Architect, http://lisasoft.com.au >> Tel: +61 (0)2 8570 5050 >> Mob: +61 (0)419 142 254 >> >> >> IEM CONFIDENTIAL INFORMATION PLEASE READ OUR NOTICE: >> http://www.iem.com/e_mail_confidentiality_notice.html >> >> >> > > > -- > Cameron Shorter > Systems Architect, http://lisasoft.com.au > Tel: +61 (0)2 8570 5050 > Mob: +61 (0)419 142 254 > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Mapbuilder-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mapbuilder-users
