Contents
What can I use to extract data from OpenStreetMap?
If you just need to work with a certain region you can use extracts in various formats such as the native .OSM (stored as XML), .PBF (A compressed version of .OSM ), Shapefile or GeoJSON. There are also different API possible such as the native OSM API or the Nominatim API.
What does overpass do in OpenStreetMap wiki?
Overpass processes these objects in order to extract their geometry (and reconnect and order them appropriately in the case of relations) as a set of polygonal boundaries.
What is the purpose of the overpass API?
Overpass API allows you to query for OSM data by your own search criteria. For this purpose, it has two specifically crafted query languages: Overpass XML, and Overpass QL. The basic semantics of Overpass API is that flows of OSM data (nodes, ways…) are generated and modified by statements, which are executed one after another.
Are there bounding filters in the overpass API?
As well, the Overpass API offers no way to geometrically transform such simple or compound shapes using positive or negative buffers, in order to use more complex bounding filters: queries have to be repeated using different pretransformed simple shapes.
What is the final data element in OpenStreetMap?
The final data element is a relation which is also an ordered list containing either nodes, ways or even other relations. It is used to model logical or geographic relationships between objects. This can be used for example for large structures as in the Palace of Versailles which contains multiple polygons to describe the building.
How to sort by object ID in OpenStreetMap?
The value bb adds only the bounding box to each way and relation and center adds only the center of the same bounding box (not the center of the geometry). The sort order can be configured by asc and qt, sorting by object id or by quadtile index respectively, where the latter is significantly faster.
How to download data from OpenStreetMap using cURL?
One way to download the data is by using the command line tools curl or wget. In order to do this we need to access one of the Overpass API endpoints, where the one we will look go by the format http://overpass-api.de/api/interpreter?data=query. When using curl we can download the OSM XML of our query by running the command