Topic | Mapbox

Trace a GeoJSON Linear Network in the Browser

GeoJSON Network Trace is a Mapbox GL JS plugin which enables upstream and downstream network tracing for seamless point and linear GeoJSON data. It was created as a quick and simple method to validate linear storm and sewer networks. In the original version I utilized TurfJS and booleanPointOnLine(), however this was too resource intensive. I swapped this method out for a simple for loop on the coordinate array of each line in the network to check for the existence of the origin point.

For more background on this tool see this blog post.

 Live Demo

A Responsive Map-Focused Store Finder

Written in Vanilla JavaScript, this project uses Mapbox GL JS to showcase stores and online purchasing options for Potocki Vodka out of Poland. Certain elements of the application were assisted by various AI tools, such as generating centroids and bounding boxes for countries.

 Live Demo

Using SQLite in the Browser and Service Workers to Power Web Maps from Object Storage

This project uses the sql.js-httpvfs library to serve vector and raster tiles from mbtiles hosted on object storage. The mbtiles could live alongside the website or be hosted on any publicly accessible url. A service worker intercepts the tile requests then returns tile data from the mbtiles fetched using simple SQL queries.

const tileData = await worker.db.query(
  `SELECT tile_data
    FROM tiles
    WHERE zoom_level = ?
    AND tile_column = ?
    AND tile_row = ?`,
    [zoom, col, (1 << zoom) - 1 - row]
  );

 Live Demo

A NodeJS GTFS Feed & Interactive Map Generator

This project consists of a NodeJS script that generates a GTFS feed and interactive map. The only requirements are a GeoJSON routes file, a GeoJSON stops file, and a handful of required static GTFS text files. The result is a feed that can be published to Google, Transit, or any transit feed service, as well as an interactive map with schedules for each route. The schedules can be fixed route with specific times or loop routes that run every hour.
The linked demo is a modified version of the origial map created for Licking County Transit.

 Live Demo

An Exporation of the Highest Mountain Peaks in the US

An exploration of the Mapbox GL JS 3D terrain functions, using the tallest US mountain peaks in each state as the study subject. Each map view in this demo project was carefully selected to provide an excellent view of the peak and its surroundings. The terrain extrusion still has a tendency to crash browsers.

 Live Demo

What if all US COVID Deaths occurred in one geographic area?

This project is based on the amazing map Brazilian Lupa. It uses a dot density visualization to represent deaths from US COVID-19 clustered in one geographic area. The populations are based on US Census Block Groups, with one dot representing 20 US deaths. All statistics are generated client-side using vector tiles and web-workers

A Presentation for the 2020 Virtual Ohio GIS Conference

This talk describes the slow and painful migration from a legacy GIS data structure of hundreds of shapefiles to a modern setup using a mix of Post...

An Exploration of a GIS Remote Work Toolkit

In the aftermath of the Coronavirus pandemic, remote work may well be come the new normal, as businesses and government agencies discover that prod...

A Simple, Client Side Tracking Dashboard for COVID-19 in Ohio

Update: This visualization is no longer being updated. There are a wide variety of authoritative COVID-19 trackers on the internet, including o...

Transforming Coordinates with JavaScript using proj4.js

In my day job we recently completed a project to field locate our water utility assets using a high-accuracy GPS unit. Now that this data is online...

A Comparison of Filter and Feature-State

Creating a hover effect is a great way to add interactivity to web maps. In mapbox-gl there are two main methods to accomplish this feature: ...

A Client Side Solution for Simple Upstream and Downstream Linear Network Analysis

A primary focus of my day job is managing utility datasets for a small municipality. I am currently in the process of taking a simple database of l...

Using PWA Components for Web Maps

The GitHub repository with all the code needed to follow along with this presentation can be found at ...

A Leaflet Version of the Original Mapbox JS Store Locator Example

This simple, responsive store locator is based on the original Mapbox JS exampl...

Geospatial Analysis for the Browser, Desktop & Server

This presentation was given at the 2018 Ohio GIS Conference. The NodeJS example is hard-coded from a real-world example in the original presentatio...

Query Features Outside the Viewport

The goal of my original post on client-side web mapping for large datasets was ...

A Visualization for GPS Tracks

This pojects uses the medium of GPS tracks to explore the linking of charts and maps. The application has a dark and light theme with custom map styles for each. The display can be exported to a an image by clicking in the upper right corner of the visualization.

 Live Demo

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An Introduction to Leaflet, GitHub & Jekyll

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Marshall Univerity 2016 GIS Day Keynote

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