On Thu, May 6, 2010 at 6:13 PM, Nolan Darilek <[email protected]> wrote:
> Sure. You can see the interface I've implemented here: > > http://travelingsales.svn.sourceforge.net/viewvc/travelingsales/trunk/libosm/src/org/openstreetmap/osm/data/IDataSet.java?view=markup > > Basically, the executive summary is that there are four broad kinds of > lookups: > > Entity by ID, as mentioned earlier > > Entities based on intersection with bounding box, currently done by the > somewhat inaccurate method of finding all contained nodes, then > returning any associated ways/relations. Would be great if I could > locate contained ways even if they don't have a node in the box, but > even if not, it'd be no worse than what's there now. :) > > Entities by presence of certain tags, in some instances also with > bounding box conditions (I.e. all "amenity"->"fuel" nodes, or all of > such nodes within a given bounds) > > Nearest entity to a given point, expanding outward. I can, for instance, > roughly find the nearest way by finding the node nearest to a set of > coordinates, checking for its presence in any ways, then finding the > next nearest and recursing outward until the conditions are met. The > conditions check is done externally, so the search need only return the > nearest entity, next nearest, etc.) > > I know you've said elsewhere that you don't want this format to replace > the need for a database, and I respect that. I just don't quite know > where that line is. Even so, I clearly don't need all of my database's > functionality for the OSM-facing aspects of this app and hope that these > limited uses are in scope. > > Thanks for thinking about and working on these issues. :) The most actively used ones are: routing: access by ID and by reverse-lookup * getNodeByID * getWayByID * getWaysForNode(nodeID) * getRelationsForWay(wayID) * getRelationsForNode(nodeID) rendering: access by bounding-box * getNodes(Bounds) * getWays(Bounds) (for zoom-levels where you render all of a city/state/country/continent separate, simplified map-datasets are used both in terms of the number of elements contained as well as their complexity.) Marcus _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
