The development_type_groups table

See above. Each row defines one development type group, but not the group's membership - the memberships are defined in the development_type_group_definitions table.

Column Name	Data Type	Description
group_id	integer	Unique identifier for this row.
name	varchar	Unique name of the development type group.
non_overlapping_groups	varchar	Name of the non-overlapping-group or empty for no non-overlapping-group.

• group_id must be unique, and greater than zero.
• name must be unique. The required development type groups must be lower case with underscores between words e.g. high_density_residential. We recommend that all names follow this style.
• names and non_overlapping_groups names must not contain spaces.
• names and non_overlapping_groups names must be lower-case.
• Development types must not overlap across the groups in the same non_overlapping_groups.

The set of required development type groups and non-overlapping-groups is determined by the set of variables used by the models being estimated or simulated. Thus, there is no way to a-priori specify which development type groups will be needed for your application of UrbanSim. There are two exceptions: First, the model Events Coordinator is internally using groups 'residential', 'mixed_use', 'commercial', 'industrial', and 'governmental'. Second, the Land Price Model (8.4.2) is using by default a filter that requires a group called 'developable'. Therefore, if you do not change this settings, make sure your table contain these entries.

UrbanSim requires some non-overlapping-groups and requires those to have certain groups within them, though they may have additional groups as well.

The example above would involve these two tables: (note: R1=1, R2=2, R3=3, M4=4, M5=5, C4=9, etc)

|development_type_groups|
group_id	name	non_overlapping_groups
50	residential	dynamic_land_use_variables
51	mixed_user	dynamic_land_use_variables
52	commercial	dynamic_land_use_variables
100	high_density_residential
101	noisy_commercial

|development_type_group_definitions|
development_type_id	group_id
1	50
2	50
3	50
4	51
5	51
6	52
...
3	100
5	100
9	101
5	101

Note that:

• R3 belongs both to groups ``residential'' and ``high_density_residential''.
• R1 belongs to group ``residential''.
• M5 belongs to groups ``mixed_use'', ``high_density_residential'', and ``noisy_commericial''.