gus_demo : building the field :
building_id name latitude longitude longest_axis_length shortest_axis_length New building
1 house 41.9310 -74.1075 80.0000 25.0000 Delete Edit
2 greenhouse 41.9310 -74.1075 16.0000 10.0000 Delete Edit
3 woodshed 41.9310 -74.1075 10.0000 5.0000 Delete Edit

Read the documentation.