the column Anläggning, which is the equivalent to feature_type_name, contains over 1000 unique archaeological feature types, all in Swedish. This in contrast to the more than 600 archaeological feature types already in SEAD in English.
- create the data-derived entity feature_types, with a primary key of feature_type_id
- tell it to consider the columns Anlnr and Anläggning, dropping all duplicates and empty rows for Anläggning to obtain a complete list of the feature types in the dataset
there is also a column Fornlämningstyp
which contains 294 different terms describing the type of find. Some of these are certainly duplicates with minor spelling differences (Skärvstanshög vs Skärvstenshög) or (Område med skogabrukslämningar vs Område med skogsbrukslämningar vs Område med skogsbrukslämnngar vs Område med skogsbrykslämningar), while others are incorrectly entered data (RT90 651130.246, 1547667.704) or (L2013:292) or (L2022:5614)
