Why is labelling important in a GeoServer?
Labelling is a complex operation, and effective labelling is crucial to obtaining legible and visually pleasing cartographic output. For this reason SLD provides many options to control label placement. To improve quality even more GeoServer provides additional options and parameters.
Can a GeoServer be used as a SLD extension?
GeoServer provides a number of label styling options as extensions to the SLD specification. Using these options gives more control over how the map looks, since the SLD standard isn’t expressive enough to provide all the options one might want. These options are specified as subelements of .
How does the maxdisplacement option work in GeoServer?
The maxDisplacement option controls the displacement of the label along a line, around a point and inside a polygon. For lines, normally GeoServer labels a line at its center point only. If this label conflicts with another one it may not be displayed at all.
When to use standard SLD label conflict resolution?
If the element is not present, or if a group of labels all have the same priority, then standard SLD label conflict resolution is used. Under this strategy, the label to display out of a group of conflicting labels is chosen essentially at random.
What does the optional element do in GeoServer?
The optional element allows specifying label priority. This controls how conflicts (overlaps) between labels are resolved during rendering. The element content may be an expression to retrieve or calculate a relative priority value for each feature in a layer.
How are labels rotated in GeoServer 2.10.x?
Rotates the label clockwise by a given number of degrees. The best way to explain these options is with examples. The anchor point determines where the label is placed relative to the label point. The anchor point values—listed here as (X, Y) ordered pairs—are specified relative to the bounding box of the label, with values from 0 to 1 inclusive.