I want to add geometry columns to a shapefile. I use the tool called Export/Add Geometry Columns. The tool automatically creates a new layer with the input layer's attributes and the new geometry columns. In previous versions this tool (very usefully) allowed to add (or update) the columns to the existing shapefile instead of creating a new one. How can this be done in the 2.16 and 2.18 versions? I tried by selecting the curved arrow icon labelled ("Iterate over this layer") but the program crashes ("An error occurred while executing Python code").
[GIS] How to add geometry columns to a layer in QGIS 2.16
fields-attributesgeometryqgis
Related Solutions
There is an option (in QGIS 2.6.1 anyway) where you can select a Unique ID Field:
- Select your desired features
- Access the Field Calculator
- Create a new field and check the option to update your selected features
- Enter a value and save the edits (this will give the selected features the same value and leaves the value for the non-selected features as NULL)
- Select this field when using the Singleparts to Multiparts tool.
Hope this helps!
Within the graphical modeler (processing > grapical modeler) add 'vector layer' as input. There you can choose if it has to be a point-, line- or polygonlayer or that it does not mather (=any)
Choose 'add field to attribute table' as many times as you need extra fields. In the last algorithm you add a description under 'Added OutputVector'.
Here you can set the fieldname, type, length and precision.
Once you added all fields with their corresponding properties give your model a name and set a group. Save it. You'll find it under C:\Users\username.qgis2\processing\models.
Once saved, the model shows up in the processing toolbox under 'Models'. Doubleclick it to open the dialogue. In the top right corner you can select 'Run as batch process'.
A new dialogue appears where you can select all the layers you want to add new fields. You have to give them a new name and location to save them as a shapefile (else they would appear as a temporary layer in your project)
Best Answer
You could use the field calculator and the expression:
For point data you can create X and Y columns and use the field calculator with:
and