GIS & IT Notes

This new features extends SLD and CSS with vendor options allowing the style writer to control the painting order of features, either inside a single layer, or across layers: this allows proper map rendering of areas where a number of objects have below/above relationships, like this area in Germany, where a lot of roads and rails are crossing each other in a maze of underpasses, overpasses, and bridges:

This is achieved by specifying a “sortBy” vendor option at the FeatureTypeStyle level, with one or more sorting attributes, and in case multiple layers or FeatureTypeStyles are involved, by grouping them into a single “sortByGroup”. You can find more information, along with examples in CSS and SLD, in your user guide.

We would like to thank DLR for sponsoring this improvement.