Military

Soundcast treats the Joint Base Lewis-McChord (JBLM) area as externals for all work trips and applies a gravity model for non-work external trips. Trips to/from external zones are built from observed LEHD commute data and JBLM uses a similar approach, using observed O-D data that can be scaled as needed for future years.

Parcel-level military jobs are available in the database table “enlisted_personnel.” This data is taken from Urbansim assumptions, with multiple entries across parcels. The data includes multiple entries for the same parcel which are aggregated to total jobs for each parcel and TAZ. For 2018, total jobs are 49,430, changing only slightly to 49,302 in 2050. Parcels are updated with these values in the government employment field (EMPGOV_P), adding to any existing in that field. These added jobs are logged in outputs/supplemental/military_jobs_added.csv. These jobs are handled differently in JBLM, where they are zeroed out, since we assert an O-D table from observed data for all model years here. These jobs are also removed from Daysim inputs, so Daysim choice models don’t try to place these jobs in places we know they should be. (Other military locations such as Navy bases are not removed from Daysim, so the military jobs added apply only to these non-JBLM locations.) The latter part of “create_ixxi_work_trips.py” updates the synthetic population file “hh_and_persons.h5” with removed JBLM jobs. Additionally, a file called “psrc_worker_ixxifractions.dat” is computed that represents the fractions of jobs in each zone that are occupied for workers from external regions. These are used by Daysim to modify workplace location choices.