Contents
How does a CQL filter work in GeoServer?
The following examples use the topp:states sample layer shipped with GeoServer. They demonstrate how CQL filters work by using the WMS CQL_FILTER vendor parameter to alter the data displayed by WMS requests. The easiest way to follow the tutorial is to open the GeoServer Map Preview for the topp:states layer.
Which is an example of a CQL filter?
For a full reference, refer to the ECQL Reference. The following examples use the topp:states sample layer shipped with GeoServer. They demonstrate how CQL filters work by using the WMS CQL_FILTER vendor parameter to alter the data displayed by WMS requests.
What are vendor specific parameters in GeoServer 2.10.x?
GeoServer supports a variety of vendor-specific WMS parameters. The angle parameter rotates the output map clockwise around its center. The syntax is: where is the number of degrees to rotate by. Map rotation is supported in all raster formats, PDF, and SVG when using the Batik producer (which is the default).
How is the buffer value calculated in GeoServer?
In both operations GeoServer attempts to compute the buffer value automatically by inspecting the styles for each layer. All active symbolizers are evaluated, and the size of the largest is used (i.e. largest point symbolizer, thickest line symbolizer).
How does a CQL filter work in Topp?
They demonstrate how CQL filters work by using the WMS CQL_FILTER vendor parameter to alter the data displayed by WMS requests. The easiest way to follow the tutorial is to open the GeoServer Map Preview for the topp:states layer.
Is the CQL _ filter parameter the same as the standard parameter?
The cql_filter parameter is similar to the standard filter parameter, but the filter is expressed using ECQL (Extended Common Query Language). ECQL provides a more compact and readable syntax compared to OGC XML filters. For full details see the ECQL Reference and CQL and ECQL tutorial.
What are the vendor parameters for GeoServer 2.2.0?
GeoServer 2.2.0 provides two quantizers, a fast RGB quantizer called octree that does not handle translucency and a slower but more accurate RGBA quantizer called mediancut. By default the first is used on opaque images, whilst the second is enabled if the client asks for a transparent image ( transparent=true ).
What are all of the geometric predicates in CQL?
The full list of geometric predicates is: EQUALS, DISJOINT, INTERSECTS, TOUCHES, CROSSES, WITHIN, CONTAINS, OVERLAPS, RELATE, DWITHIN, BEYOND.
How to add CQL filter into getfeatureinfo request?
Although I use the CQL parameters in my WMSGetFeatureInfo request nothing seems to change and I get back all the results.
How to use CQL _ filter in openlayers.control?
If there are hidden markers on the same coordinate (from the CQL_FILTER function) every marker shows a popup, even if I have filtered them out (I thought until now that is!) . So I expect after what I have researched that I also need to filter the getFeatureInfo click that sends the cql_filter with the WMS call.
Is there an extended version of CQL for GeoServer?
It is a human-readable query language, and its syntax is very similar to SQL syntax, but with extremely limited functionality. For example, it can’t encode ID filters, and it requires an attribute to be on the left side of any comparison operator. Because of the mentioned limitations, GeoServer provides an extended version of CQL, called ECQL.