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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>One variation to the steps Kenneth provided
which you may also want to consider is to use a Java applet to read the NMEA
data from the COM port connected to the GPS. You’ll need to deal with the
applet permissions, so depending on your intended user base this may or may not
be an issue. Since applets can integrate with Java Script it makes setting the
center point on the map straightforward when new position data is read from the
GPS. We’ve done this on a past project (pre-OL) and it worked out well.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Matt<o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:windowtext;font-weight:bold'>From:</span></font></b><font
size=2 color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:windowtext'> users-bounces@openlayers.org
[mailto:users-bounces@openlayers.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Kenneth Skovhede, GEOGRAF A/S<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, June 26, 2008 9:46
AM<br>
<b><span style='font-weight:bold'>To:</span></b> Didrik Pinte<br>
<b><span style='font-weight:bold'>Cc:</span></b> users@openlayers.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [OpenLayers-Users]
link with gps</span></font><font color=black><span style='color:windowtext'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>Its fairly easy.<br>
<br>
These are the steps:<br>
<br>
1. Set up OL map (I assume you have this)<br>
2. Read data from GPS<br>
3. call map.setCenter with the GPS data<br>
<br>
Step 2 varies, depending on the GPS brand.<br>
Usually you can tweak the device to put out NMEA compliant data on a COM port. <br>
NMEA is human readable, and specs can be found online.<br>
<br>
Step 3 may cause trouble, because you have to interact with a javascript inside
a page.<br>
On way is to simply host the page in an application, ie. a .Net form, then the
access is there.<br>
<br>
Another way is to create a webservice / micro webserver that returns the
current position.<br>
A javascript inside the page can then poll the position (via <st1:City w:st="on"><st1:place
w:st="on">AJAX</st1:place></st1:City>), and update the center.<br>
<br>
You may run into trouble if your map is projected into something thats not Lat/Lon
compatible.<br>
In that case, take a look at the Proj.4 library, avalible for both javascript
and regular programming.<br>
<br>
<o:p></o:p></span></font></p>
<pre><font size=2 color=black face="Courier New"><span style='font-size:10.0pt'>Regards, Kenneth Skovhede, GEOGRAF A/S<o:p></o:p></span></font></pre>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'><br>
<br>
Didrik Pinte skrev: <o:p></o:p></span></font></p>
<pre wrap=""><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt'>Hi,<o:p></o:p></span></font></pre><pre><font size=2
color=black face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>One of my client asked me if it was possible to control the center of an<o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>openlayer map by an external GPS connected to it's laptop ... <o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>I have googled a bit about this but found nothing.<o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>Does anybody have an interesting suggestion ? link ? idea ?<o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>Thanks<o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>Didrik<o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'> <o:p></o:p></span></font></pre><pre
wrap=""><font size=2 color=black face="Courier New"><span style='font-size:
10.0pt'><o:p> </o:p></span></font></pre><pre style='text-align:center'><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>
<hr size=4 width="90%" align=center>
</span></font></pre><pre><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>_______________________________________________<o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>Users mailing list<o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'><a
href="mailto:Users@openlayers.org">Users@openlayers.org</a><o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'><a
href="http://openlayers.org/mailman/listinfo/users">http://openlayers.org/mailman/listinfo/users</a><o:p></o:p></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'> <o:p></o:p></span></font></pre></div>
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