On Fri, Dec 11, 2009 at 11:33 PM, Dave F. <dave...@madasafish.com> wrote:
> This 'supports' needs clarifying.
>
> For example you list bridge=aqueduct as yes, yet it doesn't render.
> So what is the difference in meaning between support & render?
The term "recognises" is probably better than "supports". I guess the
definition is something like "is at least dimly aware of".
Looking at that specific case, the code that triggered its inclusion
in the table is this:
<Layer name="waterway-bridges" status="on" srs="&osm2pgsql_projection;">
<StyleName>waterway-bridges</StyleName>
<Datasource>
<Parameter name="table">(select way,name from &prefix;_line
where waterway='canal' and bridge in ('yes','true','1','aqueduct')
order by z_order) as water</Parameter>
&datasource-settings;
</Datasource>
</Layer>
and this:
<Layer name="water_lines" status="on" srs="&osm2pgsql_projection;">
<StyleName>water_lines</StyleName>
<Datasource>
<Parameter name="table">
(select way,waterway,disused,name,
case when tunnel in ('yes','true','1') then 'yes'::text else
tunnel end as tunnel
from &prefix;_line
where waterway in
('weir','river','canal','derelict_canal','stream','drain')
and (bridge is null or bridge not in ('yes','true','1','aqueduct'))
order by z_order
) as water_lines</Parameter>
&datasource-settings;
</Datasource>
</Layer>
So I guess while it may not have particular graphics associated with
it, bridge=aqueduct ways will get rendered at a higher z-order than
other sources of water, for instance. I'm sure a Mapnik expert can
fill us in on all the implications.
Steve
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