[Geoserver-users] Creating SLD from feature area information

GeoServer GeoServer User
1

Hi all,

I am stuck here, some help would be very appreciated.
I am trying to create a layer style ( sld ) based in area of each geometry feature in a shapefile.
It is possible? If it is not, can i use the feature id to create a style?

For while i got the below code, that try to interpolate the area values as color gradients, but it isnt working. ( Looks like the area value is not being evaluated ).

<?xml version="1.0" encoding="UTF-8"?>

sld:NamedLayer
sld:NameCOLOR_MAP NAME</sld:Name>
sld:UserStyle
sld:NameCOLOR_MAP NAME</sld:Name>
sld:TitleCOLOR_MAP</sld:Title>
sld:FeatureTypeStyle
sld:Namename</sld:Name>
sld:Rule
sld:PolygonSymbolizer
sld:Fill
<sld:CssParameter name=“fill”>
<ogc:Function name=“Interpolate”>
<ogc:Function name=“area”>
ogc:PropertyNameCNTRY_NAME</ogc:PropertyName>
</ogc:Function>
ogc:Literal1</ogc:Literal>
ogc:Literal#0000FF</ogc:Literal>
ogc:Literal2</ogc:Literal>
ogc:Literal#005FFF</ogc:Literal>
ogc:Literal3</ogc:Literal>
ogc:Literal#00BFFF</ogc:Literal>
ogc:Literal4</ogc:Literal>
ogc:Literal#20FFDF</ogc:Literal>
ogc:Literal5</ogc:Literal>
ogc:Literal#80FF7F</ogc:Literal>
ogc:Literal6</ogc:Literal>
ogc:Literal#E0FF1F</ogc:Literal>
ogc:Literal7</ogc:Literal>
ogc:Literal#FFBE00</ogc:Literal>
ogc:Literal8</ogc:Literal>
ogc:Literal#FF0100</ogc:Literal>
ogc:Literalcolor</ogc:Literal>
</ogc:Function>
</sld:CssParameter>
</sld:Fill>
sld:Stroke
<sld:CssParameter name=“stroke”>#FFFFFF</sld:CssParameter>
</sld:Stroke>
</sld:PolygonSymbolizer>
</sld:Rule>
</sld:FeatureTypeStyle>
</sld:UserStyle>
</sld:NamedLayer>
</sld:StyledLayerDescriptor>

Thanks!

2

The SLD your are using requires SE 1.1.

The common 1.0 approach is to write a rules for each value.

In any case I dubt that you have CNTRY_NAMEs called 1,2,3,4 … maybe would be better to change numbers with the country names.

···

==
Our support, Your Success! Visit http://opensdi.geo-solutions.it for
more information.

Ing. Alessio Fabiani
@alfa7691
Founder/Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 331 6233686

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

On Thu, Dec 5, 2013 at 10:44 PM, Danilo da Silveira Figueira <danilomalzao@anonymised.com> wrote:

Hi all,

I am stuck here, some help would be very appreciated.
I am trying to create a layer style ( sld ) based in area of each geometry feature in a shapefile.
It is possible? If it is not, can i use the feature id to create a style?

For while i got the below code, that try to interpolate the area values as color gradients, but it isnt working. ( Looks like the area value is not being evaluated ).

<?xml version="1.0" encoding="UTF-8"?>

sld:NamedLayer
sld:NameCOLOR_MAP NAME</sld:Name>
sld:UserStyle
sld:NameCOLOR_MAP NAME</sld:Name>
sld:TitleCOLOR_MAP</sld:Title>
sld:FeatureTypeStyle
sld:Namename</sld:Name>
sld:Rule
sld:PolygonSymbolizer
sld:Fill
<sld:CssParameter name=“fill”>
<ogc:Function name=“Interpolate”>
<ogc:Function name=“area”>
ogc:PropertyNameCNTRY_NAME</ogc:PropertyName>
</ogc:Function>
ogc:Literal1</ogc:Literal>
ogc:Literal#0000FF</ogc:Literal>
ogc:Literal2</ogc:Literal>
ogc:Literal#005FFF</ogc:Literal>
ogc:Literal3</ogc:Literal>
ogc:Literal#00BFFF</ogc:Literal>
ogc:Literal4</ogc:Literal>
ogc:Literal#20FFDF</ogc:Literal>
ogc:Literal5</ogc:Literal>
ogc:Literal#80FF7F</ogc:Literal>
ogc:Literal6</ogc:Literal>
ogc:Literal#E0FF1F</ogc:Literal>
ogc:Literal7</ogc:Literal>
ogc:Literal#FFBE00</ogc:Literal>
ogc:Literal8</ogc:Literal>
ogc:Literal#FF0100</ogc:Literal>
ogc:Literalcolor</ogc:Literal>
</ogc:Function>
</sld:CssParameter>
</sld:Fill>
sld:Stroke
<sld:CssParameter name=“stroke”>#FFFFFF</sld:CssParameter>
</sld:Stroke>
</sld:PolygonSymbolizer>
</sld:Rule>
</sld:FeatureTypeStyle>
</sld:UserStyle>
</sld:NamedLayer>
</sld:StyledLayerDescriptor>

Thanks!

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3

On Fri, Dec 6, 2013 at 10:18 AM, Alessio Fabiani <
alessio.fabiani@anonymised.com> wrote:

The SLD your are using requires SE 1.1.

Nope, the filter function is also available for 1.0

The common 1.0 approach is to write a rules for each value.

In any case I dubt that you have CNTRY_NAMEs called 1,2,3,4 ... maybe
would be better to change numbers with the country names.

Agree... where is your data coming from? If the data is from a shapefile,
the geometry column name is "the_geom".
Mind, the function computes the area using cartesian geometry, it will not
work properly if your data is in geographic coordinates

Cheers
Andrea

--

Our support, Your Success! Visit http://opensdi.geo-solutions.it for more
information.

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

-------------------------------------------------------

4

Thank you,

That is exacly what i was missing “the_geom” to get the geometry!
Sorry for my late reply,

Problem solved with:

<?xml version="1.0" encoding="UTF-8"?>

sld:NamedLayer
sld:NameGMI_CNTRY String Mapa_Mundi</sld:Name>
sld:UserStyle
sld:NameGMI_CNTRY String Mapa_Mundi</sld:Name>
sld:TitleGMI_CNTRY String</sld:Title>
sld:FeatureTypeStyle
sld:Namename</sld:Name>
sld:Rule
sld:PolygonSymbolizer
sld:Fill
<sld:CssParameter name=“fill”>
<ogc:Function name=“Interpolate”>
<ogc:Function name=“area”>
ogc:PropertyNamethe_geom</ogc:PropertyName>
</ogc:Function>
ogc:Literal100000</ogc:Literal>
ogc:Literal#0000FF</ogc:Literal>
ogc:Literal500000</ogc:Literal>
ogc:Literal#59FFA6</ogc:Literal>
ogc:Literal3000000</ogc:Literal>
ogc:Literal#FF0100</ogc:Literal>
ogc:Literalcolor</ogc:Literal>
</ogc:Function>
</sld:CssParameter>
</sld:Fill>
sld:Stroke
<sld:CssParameter name=“stroke”>#FFFFFF</sld:CssParameter>
</sld:Stroke>
</sld:PolygonSymbolizer>
</sld:Rule>
</sld:FeatureTypeStyle>
</sld:UserStyle>
</sld:NamedLayer>
</sld:StyledLayerDescriptor>

···

2013/12/6 Andrea Aime <andrea.aime@anonymised.com>

On Fri, Dec 6, 2013 at 10:18 AM, Alessio Fabiani <alessio.fabiani@anonymised.com> wrote:

The SLD your are using requires SE 1.1.

Nope, the filter function is also available for 1.0

The common 1.0 approach is to write a rules for each value.

In any case I dubt that you have CNTRY_NAMEs called 1,2,3,4 … maybe would be better to change numbers with the country names.

Agree… where is your data coming from? If the data is from a shapefile, the geometry column name is “the_geom”.
Mind, the function computes the area using cartesian geometry, it will not work properly if your data is in geographic coordinates

Cheers
Andrea

–

==
Our support, Your Success! Visit http://opensdi.geo-solutions.it for more information.

Ing. Andrea Aime

@geowolf

Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272

mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it