On lundi 20 novembre 2017 15:48:20 CET Nikos Alexandris wrote: > * Even Rouault <[email protected]> [2017-11-07 22:37:02 +0100]: > >> 2. Is OGR handling well the conversion from .osm to ESRI Shapefiles? > > > >Yes, but within the limits ot the shapefile, and particularly .dbf format: > >limitation to 254 characters for field values, 10 characters for field > >names... which are easily violated by OSM extracts. > > > >Spatialite, GeoPackage, PostGIS etc. would be better choices as output > >format> > >> 3. What is the way to split "other_tags" in multiple new fields *when* > >> knowing exactly which tags are contained and should be obtained? > > > >Edit osmconf.ini to add in the attributes= settings the tag names you're > >interested in. > > > >Even > > Dear List, > > in a custom .ini file, under the [points] layer, an `attributes=` > instruction set of values that includes `natural,cave_entrance` (key and > value under OSM's Natural key), well extracts for the points layer some > existing nodes which bear the tag `natural:cave_entrance`. > > It is not required, as far as I understand the documentation, to include > both the parent key and any values (under it) of interest. Perhaps it may > be practical to have the attributes of interest split in a separate column. > > The command I tested, for example, is: > > ``` > ogr2ogr --config OSM_CONFIG_FILE custom.ini -f SQLite -dsco SPATIALITE=YES > -gt 65536 -progress output.sqlite source.osm ``` > > While this is sufficient for the work I am doing (I can filter > `cave_entrance`s out from the `natural` column in the `output.sqlite` file), > I wonder why the entries for some nodes correctly bear the string > `cave_entrance` in the `natural` column, yet the `cave_entrance` column > itself is empty for the same entries.
The attributes keyword in osmconf.ini will select OSM tags whose *key* is one of the item specified in attributes. If you want to filter by value, you may add a -where or -sql clause with something like "natural = 'cave_entrance'" Even -- Spatialys - Geospatial professional services http://www.spatialys.com
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