How to create a list of unique values, extracted from a column within a spatial polygons data frame?

Question

Attempting to create a list of unique values, extracted from a column within a spatial polygons data frame object.

The unique function only works with vectors...

For example, if SPDF had a column name of "trees" with 5 records "birch", "birch", "aspen", "fir" and "pine". I would need a function that extracts unique values into a list.

score 2 · Accepted Answer · answered Sep 06 '19 at 14:37

2

I think this should do it

unique(spatial_df[["trees"]])

answered Sep 06 '19 at 14:37

novica

655
4
11

Thanks, looks like the `unique()` function is the way to go. – dwiz Sep 06 '19 at 14:40

How to create a list of unique values, extracted from a column within a spatial polygons data frame?

1 Answers1