I am attempting to interpolate data of a point shapefile. In the attribute table all attributes are shown correctly. When I am trying to interpolate them with Raster >> Interpolation no attributes to choose are shown.
I am not sure which fields you are talking about, but it seems you are attempting to interpolate based on a field of joined table which is not in the original shapefile. To use interpolation on a shapefile there are many points you have to check:
- The fields should be embedded in the attribute table
- Field names should not exceed 10 characters in shapefile
- Spaces are not valid in field names
- Fields type should be of numerical type. If the fields are of text type you cannot select anything.
I am not sure you are still searching for an answer but I had the same issue. By changing attribute as mentioned here and forcing the qlonglong / Integer64 to double/double and refactoring the data, I was able to select the changed fields as interpolation attribute.
Hope it will work for you too.