1

It is commonly a problem when you need all points to be labelled, but due to high density of points it is difficult to understand the ties between points and labels. Arrows would be a way, but I haven't found anything similar even in SLD extensions.

2

What you are looking for is normally called a "leader line", e.g.:

enter image description here

Unfortunately GeoServer does not support them, but if you really need them there you can follow this guide:

https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer

2

I wrote a blog post about how to do this a while ago. Basically you can use the Easy Custom Labelling plugin to create the leader lines and then save them (and the labels) as a shapefile to load into QGIS.

enter image description here

  • so to this moment leading lines should be shapes themselves? not sure it would be okay on the different scales... – Ilya Yevlampiev Jun 19 '17 at 13:59
  • you can turn them on and off with scale – Ian Turton Jun 19 '17 at 14:25

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