How to find out which elements were discarded?

[Jose]

Hello,

Is there a way find out which elements did not match any mapping rule? 

I would like to add these non-matching elements to a separate table for analysis.

Thanks,

Jose

[Imre Samu]

> Is there a way find out which elements did not match any mapping rule? 

for a simple table  - probably the negative   " filters / reject " is useful

https://imposm.org/docs/imposm3/latest/mapping.html#filters

example:

    filters:

     reject:
        highway: ["residential","service","track"]
    mapping:
      highway:
      - __any__
    type: linestring

for ALL mapping rules - it is harder. 

the SQL + Imposm3 way:

- use non-documented : use_single_id_space flag ( https://github.com/omniscale/imposm3/search?q=use_single_id_space )

- create  5 extra table  based on type (  point, linestring, polygon,  relation and relation_member )

    - without geometry

    - with hstore

    - with "__any__": ["__any__"] mapping 

- and with a simple SQL script it is easy to find the differences in the osm_id.   

or export all osm_id  to the text file in osmium format ( n987 , w653, r321 )  

and use your favorite linux text command tool to select the differences with the input osm files

     ( it is useful if you want to check/detect  the "broken osm polygons"  )

Best,

 Imre 

 ( imposm3 power user )

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