Suggestions
Chuck Purvis
Retired Transportation Planner
Chuck Purvis, a former Principal Transportation Planner/Analyst at Metropolitan Transportation Commission (MTC) in Oakland, California, is a highly experienced transportation planning expert with an impressive academic background. Purvis holds a Master of City and Regional Planning degree from Rutgers University and a Bachelor of Arts in Geography from California State University. He has an extensive technical background in travel demand forecasting, data analysis, statistical software, and methodology in urban planning.
During his tenure at MTC, Purvis was responsible for travel model development, travel forecasting, and transportation data analyses, including MTC household travel surveys and decennial census data. He has also served as the former chair of the Transportation Research Board Committee on Urban Transportation Data and Information Systems and the TRB Section on Travel Analysis Methods.
Following his retirement, Purvis continued to work as a "retired annuitant" with the Metropolitan Transportation Commission, working on data analysis projects, including the 2012/13 Household Travel Survey, 2010 decennial Census data, and American Community Survey data.
Purvis is also a freelance blogger at Census Maven blog and has a particular interest in travel survey expansion using multidimensional raking procedures and imputation methods.
Highlights
Happy #btwd Bicycle-to-Whereever Day! Most recent #census data on journey-to-work (#ACS 2018-2022).
Highest bike-to-work shares are in California college cities: Davis, Santa Barbara, Stanford.
Highest shares by county: Yolo, CA; Multnomah, OR; San Francisco, CA.
Oregon is #1 state. (After the District of Columbia).
The journey-to-work does not include journey-to-school or journey-to-college or journey-to-shop, but it still is a good indicator of the bicycle-friendliness of a particular place or city or state.
Working at Home in California, 2021 to 2022. Side-by-side maps showing number of at-home workers (size of circle) and share of workers (color of circle). These are Dorling Cartograms, where the symbols "repel" each other so they don't overlap.
Geographies are the Public Use Microdata Areas (PUMAs). Think of them as "regional sub-areas of population from 100 to 200 thousand."
A point to ponder: The PUMAs are NOT just for PUMS!! They are standard census bureau geographies, and large enough (all are 65,000+ population, they should all be 100,000+ population!) that we will get single-year American Community Survey (ACS) for all years (we hope!) PUMAs are great for sub-large city analyses: San Francisco is comprised of EIGHT PUMAs; Oakland City is divided into THREE PUMAs!
#1 subarea in 2022 in California is the Oakland Hills, at 45.4 percent work-at-home share. Given the distortion from the symbols pushing each other around, the Oakland Hills (dark brown circle in 2022) is hovering over Sacramento!
More work is needed on these maps (making sure the circle sizes and colors are consistent between the two years); and other cartographic details (clipped boundaries are still needed for 2022. Very subtle differences!)
Note that there are 256 PUMAs in California in 2021. These are the PUMAs developed from the 2010 Decennial Census. The 281 PUMAs in California, in 2022, are the first PUMAs, and ACS products, based on the 2020 Decennial Census. This may piss off people who think they need never-changing geographic areas; but I like to think of these as "regional analysis districts" that are re-drawn every 10 years to best meet the needs of state, regional and sub-regional analysts.
A little eye candy for your day!
