On 6 Feb 2008, at 04:10, John Zastrow wrote: > Artem Pavlenko wrote: >> >> On 4 Feb 2008, at 02:01, John Zastrow wrote: >> >>> I need to create an attractive set of static tiles for the USA >>> (based on >>> shapefiles) to populate a web-server-only (e.g., small-footprint, >>> not >>> dynamic, not a real map server) online map to embed in a java-based >>> application without internet access. >>> >>> My first attempt used ArcGIS to render a GeoTIFF of a layout at high >>> resolution and then passed the image into gdal2tiles.py >>> (http://www.klokan.cz/projects/gdal2tiles/) (which is EXCELLENT) to >>> create a shell OpenLayers app that I can customize. This worked >>> fine, >>> except the image quality from ArcGIS was horrible, particularly when >>> zoomed in (no anti-alias). >> >> I don't think your approach will work. Even if you manage to >> create a >> very large geotiff, re-sampling it to create low resolution tiles >> would produced anything but nice looking maps. Also, for high zoom >> levels the image size will blow your memory away. Creating good >> cartography would most certainly require per zoom level styling. >> >>> >>> I'm a now trying to use mapnik (mapnik.org) to create the same >>> image at >>> higher quality. But I am suffering deeply from an acute lack of >>> documentation which makes creating the cartography even more painful >>> (where are recipes, examples, and docs for mapnik?) >> >> Have a look at : >> http://trac.openstreetmap.org/browser/applications/rendering/ >> mapnik/generate_tiles.py >> [1] >> This script generates tiles with all styles and data defined in : >> http://trac.openstreetmap.org/browser/applications/rendering/ >> mapnik/osm.xml >> >> >>> >>> Is there something else that I can use to create the tiles needed >>> for >>> the OpenLayers app? >> >> I suggest you read OpenLayers docs. >> >>> Or is there an easier tool for creating a high-res, >>> high-quality georeferenced image that can be used by >>> gdal2tiles.py? Any >>> thoughts would be greatly appreciated. >> >> I'm not familiar with gdal2tiles.py but as I mentioned above, >> re-sampling vector maps won't produce high-res, high-quality tiles >> (assuming this is what you're trying to achieve). You might try >> creating two layers : chop your raster data with gdal2tiles.py and >> create transparent overlay tiles using Mapnik. Also, Mapnik supports >> gdal raster directly and you can generate high quality tiles with >> raster and vector combined. see [1] >> >> HTH >> Artem > Ok, you lost me a little with your last note (I agree, I'd like to > weave > together at least two zoom levels into a static tile set). Are you > saying that Mapnik can import the newly cut tiles and set transparency > (perhaps based on a color)?
No. > Can you elaborate on what I would do with > Mapnik's support for GDAL rasters? Mapnik can generate tiles from vector and raster data sources (including gdal raster). gdal2tiles.py is for *raster only* tiles. > If [1] was a link it did not come > through in the email. [1] is a link to Python script which you can use as a starting point. Here it is again: http://trac.openstreetmap.org/browser/applications/rendering/mapnik/ generate_tiles.py > > Thanks. Cheers Artem > > _______________________________________________ > Freegis-list mailing list > Freegis-list@intevation.de > https://intevation.de/mailman/listinfo/freegis-list > _______________________________________________ Freegis-list mailing list Freegis-list@intevation.de https://intevation.de/mailman/listinfo/freegis-list
