On 19-07-09 17:47, 'Xavier' via Osmand wrote: > On Tue, Jul 09, 2019 at 02:44:08PM +0200, Martin Trautmann wrote: >> On 19-07-04 20:14, Greg Troxel wrote: >>> osmand live provides files that contain differences from published >>> map files. So with a fairly recent map (and it seems to not have to >>> be the most recent one), and the delta updates, you have up to date >>> data. >> >> If this mechanism would be that easy, why would it be so time >> consuming to create new map updates for every month? > > Likely because the base monthly maps are not generated from the delta > difference files, but by reprocessing the entire OSM dataset anew each > time (the planet osm datafile, when uncompressed, is about 1 terabyte). > > And, anticipating a "why" question, one would process the data this way > to prevent a common problem when handling long chains of delta data. If > any piece of delta data in the middle of the chain is missed everything > after the missed data that depends from the missed data turns into garbage.
If the mechanism is reliable, it would be sufficient for that task. You could spread the load by building e.g. two of three from the delta, while the third is built from scratch. But as you tell me, using Osmand Live would require BOTH delta updates, as well as a monthly full (proper?) reload of the maps? Schönen Gruß Martin -- You received this message because you are subscribed to the Google Groups "Osmand" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/osmand/0953377b-1956-94d0-a6ab-4e8bcfa0a5c1%40gmx.de. For more options, visit https://groups.google.com/d/optout.
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