On Friday 07 March 2008 05:17:23 am Luca Casagrande wrote: > Hello Andrea. > > I hope not be OT, but here [1] you can find an application similar to the > one you are going to start. > In that example, the tracking system is made with a Web Application but it > can be expanded via Qgis, for the > reason that the most import thing is to update the data from the receiver. > Once you have the data updated at a certain interval, you can access them > with anything (for examples a Qgis plugin that > will reload data at a selected interval).
I think this is not as simple as described. If realtime tracking is required and to be displayed, then several things need to be considered. The gps data will be sent as either NMEA 0183 or NMEA 2000 that is known as those are the only available outputs. Most likely NMEA 0183. Then the data needs to be captured by receiver. The data is typically in text format or pending on the model. See: http://www.gpsinformation.org/dale/nmea.htm Then you need to consider what data of the data set is to be displayed as the NMEA output provides for a lot of options. Next you need to consider how the data is to be displayed and this is dependent on how many people and in what locations need to view the data at the same time. If its one person then a qgis solution "may" be possible but qgis from my vary basic review (new to al this is more or less a desktop gis solution: ie: making maps from various data source) but if more then one person is required to view the data then an integrated mapping solution such as presented in the article is the answer. Mapping servers are heavy weight server based solutions that allow for presentation of data and associated data layers which can be presented to a multitude of users via the net. Their function is to serve up maps created by application like qgis but they do support map and image creation on the fly pending on how you configure the puppy. While this is the classic and heavy weight solution its probably the preferred one. I would explore both however before making a decision. Should you go the qgis route and develop a realtime gps data capture pluggin this would be interesting. I think, Im not sure on this that you would be limited in terms of viewing the balloon on the associated map to only the person running qgis. In not aware of qgis being available to multiple users at the same time unless you use a VNC solution which is essentially a screen scrape. -- /ch _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
