I've started developing my own interactive map and I have some things which are not clear to me.
I heard that OSM, Google maps and all similar maps use Google Mercator projection. But if I use that map as my background map can I transform it to WGS84 because my other data is in WGS84 projection. Is it better to do it immediately in QGis or is it possible to change it later in some other step of creating web gis? (is it possible to do it using postgis, geoserver or openlayers?).
Is it even possible to transform it to WGS84 or it has to stay at Google Mercator?
And one more thing. What is actually the best way to add background map to my future web GIS application? Should I do it immediately in QGis (if so, is it possible to import it in GeoServer later because I can't have .shp file of it because its not shp file, it's just satellite or other type of data provided with QGis plugins.. and as far as I know, I can import only shp files in geoserver, or tables from postgis) .. or can I do it some other way?