GIS and Mapping Blog from Ireland
In honour of the Forth Road Bridge re-opening completely. I created a map of the impact it has had on drive times from Edinburgh.
This is based on the OS Open Roads Product, using pgRouting, and network generated using the guide from Ross McDonald.
This does not take into account the increase of traffic on the other routes, or traffic in general. Would be interesting to see a real impact map from one of the major navigation providers.
I have been working a lot with points recently, and one thing with the default selection highlighting in QGIS is that selections do not really stand out. This is especially true with point layers.
A bit of an extreme example, but there are 15 points selected in the middle of this image.
However, we can remedy this with the Expression Plus plugin (by Nathan Woodrow) and a rule based symbology.
This plugin adds a great function: isselected()
With this we can easily create rule to symbolise features that are selected.
The rule for symbology is as follows:
QGIS 2.12+:
isselected( @layer_name )
QGIS 2.8:
isselected( 'ACTUAL_NAME_OF_LAYER' )
So we can see that 2.12 has added a slightly more dynamic way of applying the symbology.
We can now slightly more easily see our selection.
But one final setting. With symbol levels we can really make the selections pop.
Symbol levels can be set from the bottom right of the styles tab, through rendering order. We simply want out selection to have a higher number than the other symbologies. Thus being rendered in a later pass and appearing on top.
Much better.