[Talk-us] Osmar and Ways

Mike Thompson miketho16 at gmail.com
Thu Apr 6 16:37:28 UTC 2017


Erik,

Approximately what percentage of the roads are missing?
Do the missing road share any common characteristics, such as all being
highway=track?
What is the specific bounding box you are using, and what are the
parameters of the query you are using?
Are you saying that Geofabrik is missing roads that are shown on the map on
the OSM website, or simply that some roads that you know to exist in
reality are not in OSM's data?

Mike

On Wed, Apr 5, 2017 at 7:00 AM, Greg Morgan <dr.kludge.gm at gmail.com> wrote:

>
>
> On Wed, Apr 5, 2017 at 5:35 AM, Erik MARONEY, IEA <Erik.MARONEY at 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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