[OpenLayers-Users] link with gps

[Kenneth Skovhede, GEOGRAF A/S]

Its fairly easy.

These are the steps:

1. Set up OL map (I assume you have this)
2. Read data from GPS
3. call map.setCenter with the GPS data

Step 2 varies, depending on the GPS brand.
Usually you can tweak the device to put out NMEA compliant data on a COM 
port.
NMEA is human readable, and specs can be found online.

Step 3 may cause trouble, because you have to interact with a javascript 
inside a page.
On way is to simply host the page in an application, ie. a .Net form, 
then the access is there.

Another way is to create a webservice / micro webserver that returns the 
current position.
A javascript inside the page can then poll the position (via AJAX), and 
update the center.

You may run into trouble if your map is projected into something thats 
not Lat/Lon compatible.
In that case, take a look at the Proj.4 library, avalible for both 
javascript and regular programming.

Regards, Kenneth Skovhede, GEOGRAF A/S



Didrik Pinte skrev:
> Hi,
>
> One of my client asked me if it was possible to control the center of an
> openlayer map by an external GPS connected to it's laptop ... 
>
> I have googled a bit about this but found nothing.
>
> Does anybody have an interesting suggestion ? link ? idea ?
>
> Thanks
>
> Didrik
>   
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