I work with *Qgis* and *geoserver* on windows. We need to generate *raster tiles* for basemap *(with a style defined for different viewing scales)* to serve them throw our geoserver. Our area of interest is quite important: approximately 5 french "departments" of the "Grand Est" region/area. We plan to do testing of raster and vector tiles. But I would first like to validate a method for raster tiles. Up to now now, I make tests with the *qgis Tile Generation RASTER XYZ (Mbtiles)* tool because there is a *geoserver mbtiles plugin* to support this format. Regarding the input data which are used as input layer for the tiling, I mainly made tests from the WMS/WMTS basemap provided by the french mapping agency. The tool works but the processing times are very long, and seem very memory intensive. Moreover, since I generate the tiles from a WMS / WMTS stream, the final result also depends on the stability of the network (high probability of having missing tiles ...). Finally, the mbtiles file has a quite size (5 or 6 giga for our area of interest). And the visual result is not that great either. I don't know if this is because they are raster tiles. Or a reason for EPSG? It is therefore not optimal.
I am taking the liberty to ask several questions: *A /* Qgis is a relevant tool for generating tiled files? If not, which *tool* would be interesting (mapnik, tilemill, gdal, other? I don't know much about these tools). *B /* If yes, what is the *most efficient qgis tool*? QTILES plugin? Gdal2tiles tools? Tools for generating tiles in mbtiles, XYZ, directory structure? Or generate a Virtual Raster? *C /* Is there an *output format *to prioritize? (mbtiles, XYZ, directory structure? VRT ?) *with a view to being made available by geoserver?* *D /* What would be the *recommendations* in terms of *input layers *(stream, vector data, raster). In terms of *EPSG*? *E / *What are the *advantages */ limitations of *vector tiles *compared to raster tiles? Thanks a lot.
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