Download QGIS User Guide

QGIS User Guide, Release 1.8.0
Figure 18.6: Vector properties dialog with overlay tab
2. Double click the climate layer in the map legend to open the Layer Properties dialog.
3. Click on the Overlay tab, activate
combobox.
Display diagrams and select ‘Pie Chart’ from Diagram type
4. We want to display the values of the three columns T_F_JAN, T_F_JUL and T_F_MEAN. First select
T_F_JAN as Attributes and click the [Add] button, then T_F_JUL and finally T_F_MEAN.
5. Diagram size is based on linear scaling of a classification attribute. We choose T_F_JUL, click on [Find
maximum value] and set size to 20 and Size unit
to ‘Millimeter’.
6. Now click [Apply] to display the diagram in the QGIS main window.
7. You can now adapt the chart size, or change the attribute colors double clicking on the color values in the
attribute field. Figure_overlay_2 gives an impression.
8. Finally click [Ok].
Figure 18.7: Pie chart diagram from temperature data overlayed on a map
Additionally in the Settings → Options dialog, there is a Overlay tab where it is possible to select the placement
176
Chapter 18. Plugins