Re: [OSGeo-Discuss] Re: fastest option of serving huge imagery on web map on the fly
On Fri, May 21, 2010 at 06:24:26PM -0300, Fabio Renzo Panettieri wrote: On Fri, 2010-05-21 at 13:17 -0700, Karsten-3-2 wrote: Yes. What I want to do is simply to find out the fastest options to render on the fly from raw data imagery (no tiles whatsoever stored on disk in addition to the raw data ). I will check out what SpatialCache is... From raw aerial imagery: 1. Store everything as uncompressed tiffs. 2. Make images as large as possible. (This probably requires BigTIFF support.) 3. Use overviews -- usually one for every power-of-two level from the base image up to the point where you have 256 x 256 overviews (gdaladdo) 4. If you have too many images to make one large image practical, create one reduced size image that you use at lower zoom levels. All of this is based around serving with MapServer. I have no experience using other imagery servers to solve this problem. Regards, -- Christopher Schmidt Web Developer ___ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] Re: fastest option of serving huge imagery on web map on the fly
On 21.05.2010, at 22:11, karsten vennemann wrote: Ok I was not yet familiar how MapProxy really works - from what I read it seemed not to store any physical tiles I thought (only the request parameters), but I guess that is wrong .. It does cache tiles permanently on disk. It does this in advance, on demand or never, depending on your configuration. So you can pre-cache (seed) everything till resolution x, cache on demand till resolution y and then pass through all requests below this resolution. That way you can keep your cache to a reasonable size, while still getting good performance. Regards, Oliver -- Oliver Tonnhofer o...@omniscale.de Omniscale - Dominik Helle, Oliver Tonnhofer GbR Nadorster Str. 60, 26123 Oldenburg Tel: +49(0)441/9392774-2 (Fax: 9) ___ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] fastest option of serving huge imagery on web map on the fly
I've often wondered if power-of-two was the best approach from a perception viewpoint. It definitely makes the most sense from a code perspective. Anyone know of any research on this? On 2010-05-22, Christopher Schmidt crschm...@crschmidt.net wrote: On Fri, May 21, 2010 at 06:24:26PM -0300, Fabio Renzo Panettieri wrote: On Fri, 2010-05-21 at 13:17 -0700, Karsten-3-2 wrote: Yes. What I want to do is simply to find out the fastest options to render on the fly from raw data imagery (no tiles whatsoever stored on disk in addition to the raw data ). I will check out what SpatialCache is... From raw aerial imagery: 1. Store everything as uncompressed tiffs. 2. Make images as large as possible. (This probably requires BigTIFF support.) 3. Use overviews -- usually one for every power-of-two level from the base image up to the point where you have 256 x 256 overviews (gdaladdo) 4. If you have too many images to make one large image practical, create one reduced size image that you use at lower zoom levels. All of this is based around serving with MapServer. I have no experience using other imagery servers to solve this problem. Regards, -- Christopher Schmidt Web Developer ___ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss ___ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss
