On Tue, Mar 4, 2014 at 2:06 PM, Tim Jonas <[email protected]>wrote:
> Howdy you all,
>
> after I importet OSM vector data into my PostGIS-DB using osm2pgsql, the
> column "Z_ORDER" was created by default, which is quite useful I think.
> Because I want to draw the data on my map according to their "Z_ORDER", and
> not only according to the draw order of my XML file. For instance, the
> order of the attribute "highway" is not always the same relative to the
> attribute "railway" - in some cases the attribute "highway" has to be drawn
> under "railway" and in others above, to be correct. But how can I make use
> of the "z_order" to achieve this?
>
Simply put, you cannot do that in a general waay, not with the current code
at least, in SLD the z order is controlled by feature type styles, but you
cannot create them dynamically.
If you have a small number of z orders, you can create as many feature
types styles and have the rule filters catch only the features with a
specific Z order though.
Or you could create sql views pulling a specific z order out, and create N
layers.
The most efficient way would be to have the renderer ask the database to
return features sorted by ascending z order value, but we don't have this
ability yet.
Cheers
Andrea
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