On 2014-11-08 4:00 PM, Even Rouault wrote:
Le vendredi 07 novembre 2014 14:48:57, Jeff McKenna a écrit :
On 2014-11-07 4:49 AM, Even Rouault wrote:
The ideal would to find some syntax to do this in osmconf.ini. Actually,
Jukka's mention of sqlite makes me think that the syntax could be SQL
evaluated by SQLite.
Something like :
computed_fields = z_order
z_order_type = Integer
z_order_sql = "SELECT (CASE [highway] WHEN 'minor' THEN 3 WHEN 'road'
THEN 3 WHEN 'tertiary_link' THEN 4 ... ELSE 0) + (CASE WHEN [bridge] IS
IN ('yes', 'true', '1') THEN 10 ELSE 0 END) + (CASE WHEN [layer] IS NOT
NULL THEN 10 * CAST([layer) AS INTEGER) ELSE 0 END) + ..."
And stuff in [] would be replaced by the corresponding field value.
That's something that could also potentially be done as the ogr2ogr
level, since there's hardly anything driver specific in that, but
finding the right U.I to specify per-layer computed fields isn't
obvious.
I agree, it would be very cool to be able to configure the z_order field
in osmconf.ini !!!! I'm not sure what else to add to this discussion,
other than that I really want this :)
Jeff,
I've implemented the above idea in latest trunk. I've translated the osm2pgsql
rules (*) for the lines layer. Let me know if that works OK. The
implementation of the mechanism is rather generic, so it could potentially be
used to do many other things.
That would be cool if folks could share a link to their "operational"
osmconf.ini so that we can link to it from the driver documentation page. The
default one is probably too simple for some uses.
Even
(*) when you compare osm2pgsql and imposm rules, there are differences.
osm2pgsql uses z_order = 5 for railway, whereas it is 7 for imposm. For
highway = xxx_link, osm2pgsql uses the z_order of highway = xxx, whereas
imposm uses 3. And the values of secondary and primary are differents (due to
the difference for railway likely)
Hi Even,
I've updated my GDAL version and am ready to test this change. I am
wondering though if this "computed_attributes=z_order" can be applied to
not only lines, but also points and multipolygons. I will add that into
my osmconf.ini and test to see. I will update this thread with my
results soon.
PS. thanks for the z_order addition!!!!!!
-jeff
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