QGIS 2.10 symbology feature preview
With the release of 2.10 right around the corner, it’s time to have a look at the new features this version of QGIS will bring. One area which has received a lot of development attention is layer styling. In particular, I want to point out the following new features:
1. Graduated symbol size
The graduated renderer has been expanded. Formerly, only color-graduated symbols could be created automatically. Now, it is possible to choose between color and size-graduated styles:
2. Symbol size assistant
On a similar note, I’m sure you’ll enjoy the size assistant for data-defined size:
What’s particularly great about this feature is that it also creates a proper legend for the data-defined sizes:
3. Interactive class exploration and definition
Another great addition to the graduated renderer dialog is the histogram tab which visualizes the distribution of values as well as the defined class borders. Additionally, the user can interactively change the classes by moving the class borders:
4. Live layer effects
Since Nyall’s crowd funding initiative for live layer effects was a resounding success, it is now possible to create amazing effects for your vector styles such as shadows, glow, and blur effects:
I’m very much looking forward to seeing all the new map designs this enables on the QGIS map Flickr group.
Thanks to everyone who was involved in developing and funding these new features!
Free and Open Source GIS Ramblings 
I like the layer effects very much, but right now I can’t get the graduated “size” method to work. It looks nice in the preview, but all points are of equal size in the map no matter what I change. Hope for a fix before Friday!
(haven’t tested enough yet to write a ticket)
Ohh! Found it! If you set a data defined override for size in Single Symbol, and then change to Graduated, the first data defined override will remain and cancel any settings based on size!
Great find! Please report it.
‘1. Graduated symbol size
The graduated renderer has been expanded. Formerly, only color-graduated symbols could be created automatically. Now, it is possible to choose between color and size-graduated styles’
How can someone use the colour-graduated option to represent one variable and the size-graduated option to show another variable (at the same time)? I have done this before in QGIS so that each icon effectively shows two different types of information, but now I can not figure out how to do it on QGIS 2.10.
Any assistance would be greatly appreciated.
Use data-defined settings to control the symbol size together with a color-graduated renderer.