[mapserver-users] Asking for guidelines about a project

[Saka Royban]

Thanks for ur answer and also Josh's answer.
In fact, i should be able to display path of vehicles (usually more than 1 
vehicle in display area) and also be able to save points passed by vehicles and 
time of passing (for some queries). Cause of that, i thought maybe i need one 
table per vehicle.
Do u think any more idea?

Best Regards




________________________________
From: Brent Fraser <bfraser at geoanalytic.com>
To: Saka Royban <sakaroyban at yahoo.com>
Cc: MapServer <mapserver-users at lists.osgeo.org>
Sent: Fri, June 17, 2011 7:49:20 PM
Subject: Re: [mapserver-users] Asking for guidelines about a project

  The database schema depends on what you want to do with the data     (display 
current position?  A track of historical positions?), and     how much data you 
expect (how may objects will be tracked?  how     often will they report?).

A simple schema would have one table (e.g. "vehicles"), with one row     per 
tracked object

Table: Vehicles

ID:    Name:         Position:       Status:   UpdateTime:
1      My Car        point(51,-115)  active    2011-06-16       10:23:54+02
2      Another Car   point(52,-116)  inactive  2010-05-15       11:13:12+02

With this schema, when a new position arrives for  "My Car", an     update 
statement is issued to change the row's Position and     UpdateTime (and 
possibly Status).

  The table is treated as a PostGIS point layer by mapserver.

  In my implementations, the position data was updated every 30 to     60 
minutes (they were ships and construction vehicles), so there was     no need to 
ask mapserver to regenerate a graphic every second; an     updated map was shown 
whenever a user did a pan or zoom.  You may be     able to configure OpenLayers 
to do a CGI request to mapserver every     few seconds, but I've never done 
that.


Best Regards, Brent Fraser
On 6/16/2011 11:52 PM, Saka Royban wrote: 
Thanks a lot brent
>I checked provided link and i;m gonna give it a try.
>About ur helpful advices, i'm confused about how to save data           in 
>PostGIS? with what schema? 
>
>I mean i have to keep track of each paced point by moving           objects. 
>Should i record each point as a record, so it means           one table per 
>moving object ?
>Also for displaying these varaiant data, there should some           sort of 
>plan. I don't think i'm able to say to MapServer CGI           at each second 
>connect to PostGIS and read the new data, then           i have to use 
>MapScript. Am i right? (Can this process be done           via OpenLayers?)
>
>Best Regards
>
>
>
>
________________________________
From: Brent Fraser <bfraser at geoanalytic.com>
>To: Saka               Royban <sakaroyban at yahoo.com>
>Cc: MapServer <mapserver-users at lists.osgeo.org>
>Sent: Tue,               June 14, 2011 7:14:08 PM
>Subject: Re: [mapserver-users] Asking for guidelines about a               
>project
>
> Saka,
>
>  I've had good success using PostGIS for data storage in             
>implementing tracking systems.  While you'll need to create             your own 
>code for updating the positions in the database,             mapserver can read 
>points from PostGIS and can render the             points into a map image for 
>use with the OpenLayers client.
>
>  There are other solutions too, like OpenGTS 
>(http://opengts.sourceforge.net/index.html)
>
>Best Regards, Brent Fraser
>On 6/14/2011 12:08 AM, Saka Royban wrote: 
>Hi all.
>>Strictly Speaking, i have a project that i should                   display some 
>>moving objects on a map via browser.
>>Generally, i don't know how to start? i mean how                   should i save 
>>these time-based objects in DB and how                   to retrieve and display 
>>them via Mapserver? where                   should i use client side scripting 
>>like OpneLayers?
>>Any help woudbe greatly appreciated.
>>
>>Thanks in advance
>>
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