A frequent query raised by new comers to QGIS (and other GIS systems) is "Why
don't my layers line up?". This is usually followed by a long list of things
they have vainly tried to make them line up, randomly changing the canvas and
layer projections with no luck.
At the end of this talk new (and older) users will have more of an understanding
of what projections are and how and why they need to deal with them.
A basic introductory talk which will help demystify one of the more complex issues that new GIS users face.
This talk will discuss the basics of projections, coordinate reference systems
and how this "magic" code affects the position of their data. Questions covered
will include:
- Why do you geographers force me to worry about this?
- Why doesn't it just work?
- What is this Null Island you all keep going on about?
- When should I change (override) the layer CRS?
- What happens when I change the CRS of a layer and/or the canvas?
- What is in this .prj file? Do I really need it?
Hopefully, I will end up with a set of slides, a video and a cheat sheet that gis.stackexchange users can be pointed to.