Nyall Dawson Profile picture
QGIS developer, cartographer, and proprietor of North Road Consulting (https://t.co/XPqX37JPjF)
May 14, 2021 26 tweets 4 min read
My last tweet caused quite some confusion, so here's a quick summary of why the coordinates from your $65k GPS receiver (or stored in your 6 decimal-place GeoJSON database!) have an implicit inaccuracy 🌏 A thread: The underlying issue stems from the widespread use of the dynamic WGS84 datum, and affects all coordinate reference systems which utilise this datum. This includes EPSG:4326 (which is mandated by the GeoJSON spec), and the widely used Web Mercator (EPSG:3857) CRS!
Apr 9, 2021 10 tweets 4 min read
Remember that curved #QGIS label callout I was experimenting with recently? Well it's available now in QGIS nightly releases, along with a whole bunch of other new callout sweetness 🎁👍Here's a little gallery of the new capabilities: #1 A brand new "Balloon/Speech Bubble" callout style