In the past few weeks, I have been working on Koop CLI, a Node.js CLI application for developers to build KoopJS plugins. It has been a big lesson for me about how to create an app that works at different platforms/OSs. Here in this blog post I am going to share some tips.

This article discusses how to build a continuous deployment pipeline for an AWS ECS application using Travis CI.

ArcGIS Open Data is a great network of governmental and institutional open data. While the data portal service runs on APIs, there is no official documentation of public APIs for ArcGIS Open Data. So this post is to provide the unofficial documentation of ArcGIS Open Data APIs, which are discovered in my work (mostly by accident).

Getting a place boundary is sometimes harder than it looks like.

Adding a GeoJSON layer to a Leaflet map in TypeScript has some difference from that in JavaScript.

Leaflet has a prosperous ecosystem with hundreds of plugins. Most of them are not typed for TypeScript, however, with a minimal setup, you are able to use these plugins in your TypeScript mapping project.

I am pleased to announce that OpenDataDiscovery.org is now tracking more than 1,000 open data portals, 40% of data portals in the world!

2016 is a big year for me.

After several months’ work at my spare time, I finally publish the first version of my side-project OpenDataDiscovery.org. It is a step to answer this very simple question in my mind: How many open datasets do we have on earth?

Some PostGIS functions only accept multi type geometry, so I write a simple geojson utility package to help me aggregate geojson features.