how to reproject

_posts/2024-08-09-reprojection-in-qgis.md

@@ -0,0 +1,27 @@
+---
+layout: post
+title: How to reproject features in QGIS
+date: 2024-08-09
+categories: foss
+---
+
+I came across a [brilliant thread on 
+Mastodon](https://fosstodon.org/@[email protected]/112922177589370381) by Sarah Dal discussing how 
+she worked out what the most remote post box in the UK was. But there was one remark that bothered me, she 
+said that to convert her lat, lon points to OSGB (EPSG:4326 to EPSG:27700 for the nerds) she had to go to the 
+Ordnance Survey site to find some software to do this. Since she already had the points in QGIS this seemed 
+like an unnecessary side quest to me. When I commented that she could have done this in QGIS she said that she 
+always seemed to get it wrong. 
+
+I'm confused by this (and by the many other people who ask questions on gis.stackexchange.com about the same 
+thing) so I've put together this video showing how I would do this. Basically, you right click on the layer 
+you want to reproject and select `export->Save features as` and then just change the drop down box to the 
+projection you need. QGIS will then save the features and add that layer to your project. You shouldn't see 
+any difference other than the colour of the points will change (as QGIS assigns a new random colour to the new 
+layer). 
+
+<iframe width="420" height="315" src="/images/postboxes-2024-08-09_10.28.30.mp4" frameborder="0" 
+allowfullscreen></iframe>
+
+And yes, I really should have split the Northern Irish post boxes out into a separate file and projected them 
+to the Irish grid but this is just a demo.