Megaregion Last Updated: 5/6/2024
*This date is subject to change with every model rerun, this article references the 5/6/2024 run.
This megaregion model contains population, transit, and auto ground truth data from various sources. For more information on Replica’s data sourcing and methodology, please visit our Documentation site.
Population Data
Replica’s population data is based on US Census demographic datasets which are used to create a “synthetic population” that is statistically representative of the actual population in a region. Below are the Census resources referenced in this megaregion model:
Source | Year |
American Community Survey (ACS)/ Public Use Microdata Sample (PUMS) | 2021 |
Census Transportation Planning Products (CTPP) | 2016 |
Longitudinal Employer-Household Dynamics (LEHD) | 2019 |
Transit Data
Below is a list of all the transit service providers and the routes modeled in the Fall 2023 model.
Agency | Total Routes Modeled | Ground Truth Data Source | Data Year |
Airport Ferry | 1 | Monthly Statistics | 2021 |
Capital Transit | 7 | National Transit Database (NTD) Profile | 2022 |
Inter-Island Ferry Authority | 1 | National Transit Database (NTD) Profile | 2022 |
Metropolitan Area Commuter System (MACS) | 8 | Agency Provided | 2023 |
Municipality of Anchorage People Mover | 15 | 2021 System Report | 2021 |
The Bus - Ketchikan Gateway Borough | 3 | National Transit Database (NTD) Profile | 2022 |
The RIDE | 3 | National Transit Database (NTD) Profile | 2022 |
Auto Data
Replica sources seasonal auto counts from in-vehicle GPS data that is then scaled to roughly match estimated road capacity during hours of congestion. We then verify the scaled counts against federal AADT data supplied by FHWA as an additional check. The roadway network is based on the OpenStreetMap network version published on September 1, 2023. For more information on OpenStreetMap, click here.
Below is a list of auto ground truth data provided directly by customers.