PTPX 2025
Pen plotter postcard exchange 2025!
Nathan Rooy
Biking, maps, and algorithms
Latest posts
One million (small web) screenshots
One million (small web) screenshots
The lonely bot
Missed connections and Markov chains
walkable.lol
More sidewalks plz.
PTPX 2024
Pen plotter postcard exchange 2024!
How many slices of pizza did I just burn?
Strengthen your understanding of food, calories, and exercise.
Biking from Nashville to Natchez
Biking 6 days and 500 miles from Nashville to Natchez
Pen plotting with a 3D printer
Repurposing my 3D printer into a pen plotter
Porting windspeed.app to Go
Windspeed.app is now serverless
3DPK: Hell Gate + Bronx Kill
Traversing the Hell Gate with a 3D printed kayak
Circumnavigating Manhattan with a 3D printed kayak
Circumnavigating Manhattan with a 3D printed kayak.
A visual book recommender
Recreating the used bookstore experience via contrastive learning, t-SNE, and 100M book reviews.
3D printing a full-size kayak
I 3D printed a full-size kayak in my Manhattan apartment.
Turboshtein
Turboshtein: Possibly the fastest way of computing Levenshtein distance with Python
Playing around with Dall·E 2
Playing around with OpenAI's Dall·E 2
Biking 118 non-intersecting miles in Brooklyn
Brooklyn New York, evolutionary path optimization, and my second Long Tiny Loop attempt!
The Quantified Bike Explore
Exploring New York City via GitHub Actions, OpenStreetMap, and Strava
Long Tiny Loop: Attempt #1
My first attempt at Long Tiny Loop
Making STL frontal area calculations easier
Quickly and easily calculate the frontal or projected area of an STL file
Improved routing for OSMnx with Taxicab
Improved routing for OpenStreetMap and OSMnx with Taxicab
Biking from Cleveland to Cincinnati
Biking three hundred miles from Cleveland to Cincinnati
Effective Simulated Annealing with Python
Effective Simulated Annealing with Python
Visualizing One Hundred Years of Cincinnati Maps
Georeferencing historical maps of Cincinnati
The Visual Similarity of Movie Posters
Analyzing the visual similarity of 100k movie posters with deep learning and t-SNE
BlenderFOAM: Open-source Fluid Based Shape Optimization
aerodynamic shape optimization for the masses
A Low Cost Approach to Improving Pedestrian Safety with Deep Learning
Raspberry Pi + TensorFlow = Pedestrian Safety
Finding the least efficient walking routes in Cincinnati
Visualizing the ratio between walking distance and great circle distance (as the crow flies).
Word2vec from Scratch with Python and NumPy
A Python tutorial where I cover the word2vec skip-gram model and implement a barebones version utilizing NumPy
Mapping the Chili Regions of Cincinnati [two year update]
An updated map looking at the Skyline and Gold Star chili regions of Cincinnati
Visualizing one full year of bike commuting in Cincinnati
Cincinnati is one of the best cities for bike commuting.
Evolving Simple Organisms using a Genetic Algorithm and Deep Learning from Scratch with Python
Learn how to evolve a population of simple organisms each containing a unique neural network using a genetic algorithm
Do We Actually Need to Replace the Western Hills Viaduct?
Who would be impacted if we simply removed the viaduct. Spoiler: less than 5% of the population would be drastically impacted...
Differential Evolution Optimization from Scratch with Python
Learn the fundimentals of differential evolution and implement it in Python.
Mapping the Age of Cincinnati
The age of every building in Cincinnati and Hamilton County mapped out
Biking from Cleveland to Montréal
Biking 9 days and 700 miles from Cleveland to Montréal
Calculate the Distance Between Two GPS Points with Python (Vincenty’s Inverse Formula)
Vincenty's inverse formula provides an accurate method for calcualting the distance between two latitude/longitude pairs. Learn how to implement your own with Python
Mapping out the Southern Cultural Divide in America
Updating a 35 year old map
Creating parameterized 2D airfoils with quadratic Bézier curves and Python
Before any type of shape optimization can occur, the geometry needs to be parameterized (usually…). One of the easiest ways to accomplish this is through the use of Bézier curves. For this tutorial, we’re not going to manipulate an existing geometry, rather we’re going to generate the geometry from scratch using a series of connected Bézier curves called a composite Bézier curve . A quadratic…
Calculating the Distance Between Two GPS Coordinates with Python (Haversine Formula)
By making a few geometric assumptions, the Haversine formula provies an exceptionally simple way of calculating distance between two latitude/longitude pairs.
Montréal’s Language Distribution According to Twitter…
Mapping 130k geotagged tweets broken down by language.
Cincy to Dayton and Back by Bike / My First Century!
Biking from Cincinnati to Dayton and back.
Particle Swarm Optimization from Scratch with Python
A tutorial that covers the basics of particle swarm optimization while implementing a simplified, barebones version with Python
Mapping the White Castle/Krystal Divide
Mapping out the White Castle vs. Krystal divide
FiveThirtyEight: The Riddler (2016-July-08)
Archvillain Laser Larry threatens to imminently zap Riddler Headquarters!
Mapping out IHOP vs. Waffle House
mapping out the IHOP vs. Waffle House divide
Dog Ownership in Cincinnati [map]
A data centric look at dog ownership in Cincinnati and Hamilton County.
Mapping the Chili Regions of Cincinnati
Mapping out the Skyline and Goldstar chili regions of Cincinnati