<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<title></title>
</head>
<body text="#000000" bgcolor="#ffffff">
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?).<br>
<br>
A simple schema would have one table (e.g. "vehicles"), with one row
per tracked object<br>
<br>
Table: Vehicles<br>
<br>
<tt>ID: Name: Position: Status: UpdateTime:<br>
1 My Car point(51,-115) active 2011-06-16
10:23:54+02<br>
2 Another Car point(52,-116) inactive </tt><tt>2010-05-15
11:13:12+02</tt><br>
<tt><br>
</tt>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).<br>
<br>
The table is treated as a PostGIS point layer by mapserver.<br>
<br>
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.<br>
<br>
<pre class="moz-signature" cols="72">Best Regards,
Brent Fraser</pre>
<br>
On 6/16/2011 11:52 PM, Saka Royban wrote:
<blockquote cite="mid:433062.77447.qm@web121619.mail.ne1.yahoo.com"
type="cite">
<style type="text/css"><!-- DIV {margin:0px;} --></style>
<div style="font-family: times new roman,new york,times,serif;
font-size: 12pt;">
<div>Thanks a lot brent<br>
I checked provided link and i;m gonna give it a try.<br>
About ur helpful advices, i'm confused about how to save data
in PostGIS? with what schema? <br>
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 ?<br>
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?)<br>
<br>
Best Regards<br>
</div>
<div style="font-family: times new roman,new york,times,serif;
font-size: 12pt;"><br>
<div style="font-family: times new roman,new york,times,serif;
font-size: 12pt;"><font face="Tahoma" size="2">
<hr size="1"><b><span style="font-weight: bold;">From:</span></b>
Brent Fraser <a class="moz-txt-link-rfc2396E" href="mailto:bfraser@geoanalytic.com"><bfraser@geoanalytic.com></a><br>
<b><span style="font-weight: bold;">To:</span></b> Saka
Royban <a class="moz-txt-link-rfc2396E" href="mailto:sakaroyban@yahoo.com"><sakaroyban@yahoo.com></a><br>
<b><span style="font-weight: bold;">Cc:</span></b>
MapServer <a class="moz-txt-link-rfc2396E" href="mailto:mapserver-users@lists.osgeo.org"><mapserver-users@lists.osgeo.org></a><br>
<b><span style="font-weight: bold;">Sent:</span></b> Tue,
June 14, 2011 7:14:08 PM<br>
<b><span style="font-weight: bold;">Subject:</span></b>
Re: [mapserver-users] Asking for guidelines about a
project<br>
</font><br>
<meta http-equiv="x-dns-prefetch-control" content="off">
<title></title>
Saka,<br>
<br>
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.<br>
<br>
<span> There are other solutions too, like OpenGTS (<a
moz-do-not-send="true" target="_blank"
href="http://opengts.sourceforge.net/index.html">http://opengts.sourceforge.net/index.html</a>)</span><br>
<pre class="moz-signature">Best Regards,
Brent Fraser</pre>
<br>
On 6/14/2011 12:08 AM, Saka Royban wrote:
<blockquote type="cite">
<div style="font-family: times new roman,new
york,times,serif; font-size: 12pt;">
<div>Hi all.<br>
Strictly Speaking, i have a project that i should
display some moving objects on a map via browser.<br>
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?<br>
Any help woudbe greatly appreciated.<br>
<br>
Thanks in advance<br>
</div>
</div>
<pre><fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
mapserver-users mailing list
<a moz-do-not-send="true" rel="nofollow" class="moz-txt-link-abbreviated" ymailto="mailto:mapserver-users@lists.osgeo.org" target="_blank" href="mailto:mapserver-users@lists.osgeo.org">mapserver-users@lists.osgeo.org</a><span>
<a moz-do-not-send="true" target="_blank" href="http://lists.osgeo.org/mailman/listinfo/mapserver-users">http://lists.osgeo.org/mailman/listinfo/mapserver-users</a>
</span></pre>
</blockquote>
<meta http-equiv="x-dns-prefetch-control" content="on">
</div>
</div>
</div>
<pre wrap="">
<fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
mapserver-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:mapserver-users@lists.osgeo.org">mapserver-users@lists.osgeo.org</a>
<a class="moz-txt-link-freetext" href="http://lists.osgeo.org/mailman/listinfo/mapserver-users">http://lists.osgeo.org/mailman/listinfo/mapserver-users</a>
</pre>
</blockquote>
</body>
</html>