Re: [Geoserver-users] Geoserver CSS Module

[Mark Cupitt]

Hi Jody, Thanks so much.

I am definitely styling on Scale and Attribute, for example

[landuse='forest'][@scale>60000][@scale<100000]{
  z-index: 30;
  stroke: #CBEBB6;
  fill: #CBEBB6, url("
http://icons.markware.net/geoserver/icons/img/areas/forest.png";);
  fill-size: 20px;
}
[landuse='forest'][@scale<60000]{
  z-index: 30;
  stroke: #CBEBB6;
  fill: #CBEBB6, url("
http://icons.markware.net/geoserver/icons/img/areas/forest.png";);
  fill-size: 30px;
}
[landuse='commercial'][@scale<1000000] {
  z-index: 40;
  stroke: #5F9EA0;
  fill: #87CEFA, url("
http://icons.markware.net/geoserver/icons/img/areas/commercial.png";);
  stroke-width: 0.5px;
  fill-opacity: 0.75;
  label: [name];
  font-size: 10px;
  font-fill: #000000;
}
(I use scale a lot to change the colors or graphic fills, and have a ton of
poly attributes to style)

I use z-index a lot to get the featuretypestyles in the right order.

I need to get my head out of SLD thinking .. I think that is my biggest
issue.

I would love to attend your workshop, but I am quite remote in the
philippines so it is not practical for me, unfortunately. It is a loong way
to travel, but I do avidly look forward to the published papers

Regards

Mark




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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On Wed, Jun 25, 2014 at 12:17 PM, Jody Garnett <jody.garn...@gmail.com>
wrote:

> 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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