Impervious areas in Madison
Data viz with waffle charts, or not
Harald Kliems
My personal website, with #rstats, transportation, open data, Madison, biking, and some health research
Latest posts
Some Wisconsin County Level Population Data
The 2025 Census Bureau Population Estimates are out
Street level imagery and OpenStreetMap
I gave a talk at Mapping USA 2026
Speed limits on tertiary highways and traffic stress
A look at OpenStreetMap data in Madison and Milwaukee
Travel times on Willy Street, Part 2
Another look at travel time estimates, now including the JND construction
#30 Day Map Challenge: Points
Madison restaurants and their cuisine
Travel times on Willy Street
A preliminary look at the data during the rush hour lane closure trial
How many cars are there in Madison?
Using American Community Survey data to look at car ownership in Madison over time.
What happens when you remove rush-hour travel lanes?
Using the Google Maps API to collect travel time data during a traffic trial
County-level population change in Wisconsin
Which counties have gained the most population between 2020 and 2024? Which ones shrunk?
A 3D map of downtown Madison
Using digital surface model data and `rayshader` to create a detailed rendering
#30DayMapChallenge: A boring points map
Comparing fair market and assessed value in Madison
Nothing new on mode share in Madison in 2023
American Community Survey one-year estimates show commute mode share remains stable
Do speed limit reductions reduce speeds?
Comparing pre-post data in Madison, Wisconsin
Bicycle Network Analysis and Bicycle Commute Mode Share
Do better bike networks lead to more bike commuters?
After the sun sets, pedestrian fatalities spike
Pedestrian fatality data from 2001-2021 and how the time of fatal crashes varies over the day
Where are the 4+-car households?
A quick look at households with 4 cars or more.
Madison's largest temperature swings
From 67 to 15 F overnight??
Comparing counts from Strava Metro and loop counters
Can Strava Metro data in Madison be a good indicator of overall bike traffic?
Population growth in Wisconsin
Mapping population growth since the 2020 census
Winners and losers in bike mode share
Where did bike commuting grow, where did it shrink.
Quick post: Commute time in Madison
How long does it take Madisonians to get to work?
#30DayMapChallenge: A "bad" map of the US
Places that start with "bad" (but not "badger"!)
Quick post: Job growth in Dane County
Some maps and charts of 2015 and 2019 LEHD data
The State of Biking in Madison 2022
A look at several indicators of how many people biked (and took other means of transportation).
`ntdr 0.3.0`: Now available on CRAN
An R package for National Transit Database data
Rent and rent burden in Madison, Wisconsin
Some quick charts for Madison and how it compares to other US cities
Before and after the Metro Network Redesign
Comparing transit accessibility with the r5r package
Understanding Raw and Adjusted Data in the National Transit Database
A comparison of Madison Metro ridership data released in the National Transit Database at different points in time.
Map fun with City of Madison tax parcel data
Building age, property use, and architectural styles in Madison
Candidate questionnaires for local elections
Using `knitr` and `RMarkdown` for formatting form responses
Bicycle and pedestrian intersection crashes in Madison
A quick look at crash data to support efforts to no longer allow right turns on red.
Coffeeneuring Challenge 2022
Making a map of this year's season
The color of roads
What colors are most represented in the road names of Dane County?
#30DayMapChallenge: Restaurant heat map of Madison
Challenge 15: Food/drink
#30DayMapChallenge: 5-minute map
5-minute isochrones around Metro Transit bus stops
What's the latest on commute mode share in Madison?
Working from home has seen an unprecedented boom, while biking stagnates.
Wrangling unwieldy open records data
Using R, {msgxtractor}, and R Markdown to wrangle a set of msg files
How much housing is being built in Madison?
A look at housing permit data over time.
How far can you go?
Comparing how far you can travel by bus, bike, and e-bike in Madison, before and after the bus network redesign
Metro Madison ridership has not recovered from COVID
A quick time series chart of Metro ridership going back to 2002
Boardings per bus per stop: A useful metric?
A follow-up on a post on Metro bus boardings per stop in Madison (WI)
A Vision Zero Twitter Bot for Madison
Using R, the rtweet package, and GitHub Actions to automate weekly tweets about traffic safety
Do crashes have a history?
What the locations of past crashes can and cannot tell us about future crashes
Where the shelter can't go: Using data to dissect city policy-making
Policymakers proposed criteria for a where a shelter for homeless men in Madison (Wisconsin) could and couldn't go. This post uses public data to visualize these criteria, showing that in the end the resolution would have meant that the shelter can't go anywhere.
Scraping 4S
Web scraping and text analysis of the Society of Social Studies of Science's 2021 annual meeting panels.
Madison Common Council Advisory Referendum 2021
How precincts voted about the questions whether Madison Alder should be a full-time job and how long terms should be
Dane County Migration Flows
The `tidycensus` package got an exciting new function
Race demographics by aldermanic district
What are the racial demographics of Madison's aldermanic districts
Visualizing commute flows in Wisconsin
LODES provides origin-destination data for connecting work and home. This article looks at patterns in those flows in Wisconsin, and especially in Madison