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St. Louis Imagery – 1990 to Now

What kind of changes to the built environment happened in your city within the past 25 years? Looking at and comparing aerial imagery can be an informative and compelling way to investigate changes. In St. Louis, many large building developments have happened over the years including: The St. Louis Arena Demolition The building and opening […]

National Park System

If you look at all the National Parks across the US, there are about 60: The National Park Service manages many more “park units” other than just the officially-designated “National Parks.” These include things like National Lakeshores, National Monuments, National Parkways, National Preserves, etc. In total there are about 400 units across the US: The […]

Custom Web AppBuilder Widgets in TypeScript

If you’re a JavaScript developer, you may have heard of TypeScript, a typed superset of JavaScript that compiles to plain JavaScript. If you’re also creating custom Web AppBuilder widgets, using TypeScript in a widget is a great way to get started with TypeScript. Here are a few notes and tips that I’ve discovered while using […]

Published Web App

Last week Missouri got a lot of rain, which caused flooding in the Meramec river valley near St. Louis. I received a link to an ArcGIS Image Service that Surdex had created and provided that showed the flooding as of Tuesday 5/2. They flew this imagery as a service to the government and first responders, […]

Extending Widgets in ArcGIS Web AppBuilder

I’ve had many requests and ideas for Web AppBuilder widgets over the past few years, and many times they are ideas that are building on an existing widget. For example, a query widget that is custom to a particular workflow, an edit widget that enforces certain geometry movement restrictions, or maybe adding a few more […]

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Gavin Rehkemper

JavaScript, WordPress, and GeoDev