Conditional field calculator

We would like to use the European Urban Atlas as an information vector layer to extract reference data for an automated actual land cover classification. The original Urban Atlas classifcation scheme has 37 classes. We need to select and merge some classes and simplifying the scheme to be usable as training data input for land cover classification.

1. Click Add vector layer and select file geodata/vector/Subset-Goe_DE021L1_GOTTINGEN_UA2012_UTM32N.shp.
2. In the processing toolbar, type Field calculator to browse for the QGIS --> vector --> Field calculator) and open it.