On Wed, Apr 5, 2017 at 5:35 AM, Erik MARONEY, IEA <erik.maro...@iea.org> wrote:
> To whom it may concern, > > > > My name is Erik Maroney and I work for the International Energy Agency > (IEA). We are interested in using Open Street Map (OSM) for our road > infrastructure projections. We have had a couple of issues so far that we > are confused about. > > > > 1) Using R, we set the source to API and downloaded osm. It seems > as if some of the roads mapped on the OSM website aren’t being caught by > osmar (the R package), which interfaces with osmosis (the command line > tool). Could this perhaps be an issue with the bounding box, or is there > some other reason why not all the roads are being captured? Any assistance > with this issue would be very helpful! > > 2) Using the Geofabrik database, it seems all the highways are not > fully captured, is this just due to missing data? Because when we go to > the OSM website, we see plenty of other roads. This is also true when we > use the bounding box API method. > > > > Ultimately, the mismatch between the roads (especially highways and > non-urban roads) mapped directly on OSM versus those we are able to > download with R is our point of concern. Specifically we would like to come > up with an automated way to capture all roads that service motorized > vehicles within certain countries. > > > > > The QuadTiles[1] may provide a visual for your potential bounding box issue. The area to look at is the intersection of a line and a tile[2]. Depending on your bounding box, you could miss a road if the nodes are in other areas but the road still runs through your bounding box. You may have to use a more detailed configuration for your work.[3] [1] http://wiki.openstreetmap.org/wiki/QuadTiles [2] http://wiki.openstreetmap.org/wiki/QuadTiles#Indexing_tile_intersections [3] https://switch2osm.org/
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