node.js – geoMusings

Watching COVID-19 Data for Your County with PostgreSQL and Node

2020-04-022020-03-31 by Bill Dollins

I have addressed the topic of triggered notifications a couple of times on this blog previously. I’ve taken the opportunity to apply the technique to a current use case – the ability to get notifications whenever the confirmed count of COVID-19 cases changes in my county or surrounding ones.

I am basing this workflow on the Johns Hopkins University county-level data available as an ArcGIS feature service here: https://services1.arcgis.com/0MSEUqKaxRlEPj5g/arcgis/rest/services/ncov_cases_US/FeatureServer

Using the “f=geojson” parameter, it is possible to download the data in a format (GeoJSON) that is readily consumable by OGR. As a result, I was able to initiate a core workflow using the following steps.

A Perhaps-Premature Recap of My Year

2015-12-01 by Bill Dollins

The calendar is inching up on the nine-year anniversary of this blog and it’s starting to feel like it’s been that long since I’ve actually written anything. It’s been an interesting year and the last couple of months have been no exception. It’s probably a bit early for a year-end recap but I feel the need to clear my mind so I can focus on what comes next.

I started the year splitting my time between two projects: one was implementing a geospatial data publication workflow for a US federal civilian agency. I was part of a large team and my role was to work out the ingest, registration, publication of all data types. That project got me elbow-deep in Node, PostGIS, GeoServer, and also gave me some exposure to the Voyager search API. I found the whole experience pretty exciting as we had a really strong implementation team. As a result, I learned a lot and , hopefully, was able to teach a few things along the way. It was the kind of experience you hope every project can be. My involvement wound down toward the middle of the year.

A Brief Recap of JS.GEO

2015-10-16 by Bill Dollins

Working with Node and the GeoServer REST Configuration API

2015-02-27 by Bill Dollins

I’ve been working with a mix of technologies lately that includes Node and GeoServer. I’ve recently begun integrating the two by using Node to manipulate GeoServer’s configuration through the REST API it provides for that purpose. One task I’ve been working on automating is the registration of vector layers stored in PostGIS with GeoServer to make them available via WMS, WFS, and the various other services provided by GeoServer.

Getting Reacquainted With GeoServer

2014-12-04 by Bill Dollins

Over the past few weeks, I’ve had the opportunity to get back in touch with GeoServer. It used to figure more prominently in my toolbox but I got away from it because it simply didn’t factor into most of my project work. Time being a limited resource, it had to go on a shelf.

I’m working with GeoServer 2.6.1 this time around. I always found it to be easy to set up but it think the initial installation borders on trivial now. I was setting it up on an Ubuntu EC2 instance so the entire process was conducted from the command line. From start to finish, it took me about ten minutes, half of which was Tomcat configuration.

Simple Tile Viewer

2013-04-25 by Bill Dollins

We do a lot of tiles for various customers at Zekiah. Tiling is as much art as science and sometimes things go wrong so we have a range of utilities that we use to perform various kids of QA. Because the caches can be large, we usually want to perform a visual QA on the static tiles before pushing them up to wherever they are going to live full-time.