Nyall Dawson Profile picture
Apr 9, 2021 β€’ 10 tweets β€’ 4 min read β€’ Read on X
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 πŸŽπŸ‘Here's a little gallery of the new capabilities:
#1 A brand new "Balloon/Speech Bubble" callout style
which includes the ability to round off the corners, so you won't poke your eyes out. Showcased here with a nice subtle drop shadow for a little emphasis boost.
#2 The previously shown curved callout style. Shown in the beautiful example below by @imhere_asia which highlights the super-smart "automatic" curve orientation option.
What's that, you don't believe it's so smart? Well maybe this map will change your mind!
#3 Next up #QGIS now allows exact, interactive positioning of callout lines using the "move labels/callouts" tool (pro tip: holding shift constrains the movement to 15 degree angle increments!)
#4 If you've got specific logic you want to use to place callouts, you can now set the callout start and end placement on a feature-by-feature basis using attribute or expression derived values:
#5 The new option to trim away the start or end of line symbology unlocks a whole range of new callout symbol styles, including this one:
(here I've used a callout line style which trims 3 mm away from the end of the line, and then uses a marker line with "end" placement to show the circular outline highlight around the feature!)
... all very exciting stuff heading your way in #QGIS 3.20! (it's funny to think that not so long ago the only way to get callouts in QGIS was via fiddly hacks, and now it has truly world-class callout capabilities!) 😻

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More from @nyalldawson

May 14, 2021
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!
These reference systems are "dynamic", in that they aren't fixed to positions on the actual surface of the Earth.
Read 26 tweets

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