I expect you are producing a "power set" between when you combine your two
files, this is often done by:
1) only using rules to style
2) doing your theme based on more than one aspect of your data
- example; theme based on scale and attribute
- example: theme based on two attributes
- example: theme based on scale and several attributes
You can notice this if your resulting SLD has many rules that accomplish
the same thing, except at a different scale (or with a different attribute
combination).
Recommendation:
1) Use rules for scale first! Since that *only* works for rules.
If you need to "break up the party" you can set up a group layer with
several child layers - each child layer configured with CSS for a a
different scale. Clients can draw the group layer and GeoServer will draw
the appropriate child based on scale. This also has the *key* advantage of
allowing you to draw simplified datasets when zoomed out which is a killer
optimisation technique.
This approach will prevent a power set based on differences of scale, you
are stuck with some duplicate configuration but you would get that anyway
as you optimise performance.
2) Use a combination of rules and symbology encoding functions when theming
based on more that one attribute. This is especially useful when the aspect
you are theming is contained like font size or polygon color.
-
http://boundlessgeo.com/2012/08/thematic-map-creation-with-sld-is-now-much-easier/
Here is an example of recode from a workshop I am doing at foss4g this year:
* {
fill:[
recode(mapcolor9,
1,'#8dd3c7', 2,'#ffffb3', 3,'#bebada',
4,'#fb8072', 5,'#80b1d3', 6,'#fdb462',
7,'#b3de69', 8,'#fccde5', 9,'#d9d9d9')
];
stroke: gray;
stroke-width: 0.5;
}
The alternative is:
[mapcolor9=1] {
fill: #8dd3c7;
}
[mapcolor9=2] {
fill: #ffffb3;
}
[mapcolor9=3] {
fill: #bebada;
}
[mapcolor9=4] {
fill: #fb8072;
}
[mapcolor9=5] {
fill: #80b1d3;
}
[mapcolor9=6] {
fill: #fdb462;
}
[mapcolor9=7] {
fill: #b3de69;
}
[mapcolor9=8] {
fill: #fccde5;
}
[mapcolor9=9] {
fill: #d9d9d9;
}
* {
stroke: gray;
stroke-width: 0.5;
}
Now if you imagine doing this with scale rules as well the power set idea
is clear:
1) With mapcolor9 rules and 5 zoom levels we have 45 SLD rules generated
2) With mapcolor9 recode function and 5 zoom levels we have 5 SLD rules
generated
Hope that helps Mark.
If you want to attend the workshop it is here:
https://2014.foss4g.org/schedule/workshops/
Both the docs.geoserver.org and foss4g websites are down for me right now,
hopefully they will be back when you get this.
Jody Garnett
On Wed, Jun 25, 2014 at 12:40 PM, Mark Cupitt <markcup...@gmail.com> wrote:
> Good Day all. I am still having trouble with the Geoserver CSS Module with
> large CSS files.
>
> I have two smaller CSS files that process nicely and produce expected SLD,
> but when I combine them, they produce a humungus 84K line sld
>
> I am certain I am missing something, or have I have possibly hit a
> limitation of the CSS module.
>
> ANy help or suggestions are very much appreciated.
>
> The files are available at http://markware.net/css.zip
>
> osmph_polys.csss (4 seconds to process) (160 lines)
> osmph_polys.sld ( result = 2895 lines)
>
> osmph_polys_landuse.csss (5 seconds to process) (357 lines)
> osmph_polys_lamduse.sld ( result = 1209 lines)
>
> osmph_polys_combined.csss ( 9 minutes to process, 100% cpu, 100% java
> Container Memory) (500 lines)
> osmph_polys_combined.sld (result = 80,440 lines)
>
> Regards
>
> Mark Cupitt
>
> "If we change the world, let it bear the mark of our intelligence"
>
> See me on Open StreetMap <https://www.openstreetmap.org/user/Mark_Cupitt>
>
> See me on LinkedIn <http://ph.linkedin.com/in/markcupitt>
>
>
> *See me on StackExchange <http://gis.stackexchange.com/users/17846/mark-c>*
>
>
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http://p.sf.net/sfu/Bonitasoft
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