Diff files with OSMPythontools.overpass

Help and support
1

How can I query for diff files using OSMPythontools? Probably used wrong search terms but can’t find how to adjust my query so I only get the changes that occurred since my download. The query I currently use is:

query = overpassQueryBuilder(
bbox=(mila, milo, mala, malo),
elementType=[‘node’, ‘way’, ‘relation’],
selector=‘“tourism”=“{}”’.format(label),
includeGeometry=True
)

Questions:
How do I adjust above query so I only get items that changed since a certain date?

I assume that the diff file contains all the data of the POI that have changes and I can use the same script to extract the wanted data as I did with the original query. Is this assumption correct?

Do items that have been deleted/removed from the database occur in the diff file? If so, how can these be identified? If not, how can I find the items that are deleted?

2

It looks to me you are trying to use:

to retrieve some data you are interested in.

I would first use the overpass website to create a query that works and only then switch back to python.

For overpass there is quite some documentation available, for a start I would try something based on:

If you can not get this to work as you like, post the query here and indicate what it is not yet doing.

3

Thanks for the reply. Though I’ve understood that the same query language should be used, I find that the web version and OSMPythontools, but I find the formatting is different. I’m unable to find anything regarding diff files with regards to OSMPythontools. I get it to work in the web version based on Overpass API/Overpass QL - OpenStreetMap Wiki, but I can’t get it to work with OSMPythonTools. So the way I look at it, it should be just a formatting issue.

In the web version I can query the diff file with:

[out:xml][timeout:25][diff:“2023-01-01T00:00:00Z”];
nwr"tourism"=“attraction”;
out geom;

But for some reason I don’t get it to work in my code. The query I use:

query = overpassQueryBuilder(
bbox=(mila, milo, mala, malo),
elementType=[‘node’, ‘way’, ‘relation’],
selector=‘“tourism”=“{}”’.format(label),
includeGeometry=True,
)

I fire off the query via:

result = overpass.query(query, timeout=25)

The seemingly obvious approach would be to add the diff statement to the last statement, but that results in a ‘unexpected keyword argument’ error. Tried also a few ways to add it to the query itself but I don’t get it to work.

4

If I am correct the problem is getting the diff data, normal queries are fine with OSMPythontools, correct?

If so, reading the documentation I think that OSMPythontools do not support it.

You could try it with another python library

This library seems to use plain overpass queries.

5

Thanks, I’ll have a look at overpy.