[Qgis-user] Re: GPX, OS Grid References and Google Earth

[Nick Hopton]

Des Callaghan wrote
> 
> Many thanks Lene and Nick, this worked a treat. Combined with the Google
> Satellite basemap, imported using the fantastic 'OpenLayers' plugin, this
> is
> just what I needed. Many thanks for your help. Best wishes, Des
> 

Just a couple of points arising, Des. It's very useful to be able to overlay
your own data on OpenLayers to get a visual indication of of how well it
fits. But OpenLayers use a very peculiar CRS which can make it unsafe to do
thing like use the tape measure for measuring distances or the area tool for
measuring areas. The other thing is that closing OpenLayers will leave your
project CRS in the Google Projection, fix this by resetting your project
projection to your shapefile layer projection. If you would like some GB
base maps to use with your GPS data you could try OS OpenData VectorMap
District Rasters. They are pretty base too, but accurate.

Nick.


--
View this message in context: http://osgeo-org.1560.n6.nabble.com/GPX-OS-Grid-References-and-Google-Earth-tp4907061p4910779.html
Sent from the Quantum GIS - User mailing list archive at Nabble.com.