On 9/16/2016 5:37 PM, Spencer Gardner wrote:
It's not clear to me how osm2pgsql handles multiple values for the
same key on an OSM feature. For example, imagine I have a way with the
following tags:
parking:lane:right=perpendicular
parking:lane:left=parallel
"parking:lane:right" and "parking:lane:left" are different keys. What
happens depends what your tag transform is doing. The default C tag
transforms does nothing special with those keys, so doesn't change the
values or anything. A lua tag transform or a multi-backend style does
what you have defined it to.
1. How does the "parking" column reflect this after the import
assuming that my style file has an entry for parking?
If those are the only tags and there is not a "parking" key on the
feature, the column is null with the C tag transforms.
1. Is there a way to define styles that separate these? (i.e. one
column for parking:lane:right and another column for
parking:lane:left?
My understanding of hstore is that it will suffer from the same
problem--if there's a duplicate entry for the same key it takes the
first and ignores the others. If this is not the case I'll investigate
using that for my purposes.
If you want a column for parking:lane:right and parking:lane:left, add
both to your style file.
If you want to do something more sophisticated, you need to use Lua
transforms. You could have a column which indicates which sides there is
parking on. https://github.com/ClearTables/ClearTables/issues/51 is
about something similar for maxspeed:forward and maxspeed:backward
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