On Wed, Nov 21, 2012 at 11:50:38AM +0100, [email protected] wrote: > > How many nodes in the planet lack a latitude or longitude? Using a MAXINT > > encoding will cost about 8 bytes for each missing latitude or longitude. > > It's possible to reduce this to 2-3 bytes, but the format gets > > uglier/hackier. IMHO, probably not worth that cost. > > As far as I understood, only nodes with the attribute action=delete do not > have (resp. do not need) lon/lat. On the other hand, it does not hurt to give > them false lon/lat values. This is what osmconvert does when you apply the > --fake-lonlat option. > > In PBF, lon/lat are delta coded, aren't they? Thus it would be best to write > a delta of 0, i.e., to take the logical value of the previous node. A few > steps later in the toolchain lon/lat values of action=delete objects will be > deleted anyway (together with their objects).
You only have missing lon/lat in OSM files with history. And presumably you use them because you want to know when what objects were created and deleted and so on. So you can not just ignore deleted objects. And you want to know whether an object had no lon/lat as compared to the lon/lat of the object that happened to be right before it in the file. So your solution doesn't work. Jochen -- Jochen Topf [email protected] http://www.remote.org/jochen/ +49-721-388298 _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
