I have gridded depth points in CSV format that I'm trying to add other map data to, in additional columns. I've tried joining fields, hoping that I could link the Shapefile data to the csv, but when I try to display the csv by graduated symbols based on the new fields, it goes blank. I used Nathan's tips from here, but imported the csv as csv since I want to add map info to that, rather than adding csv info to a map.
See this picture below for the sea bottom temperature & salinity voronois by month, underneath the csv points (a sample subset), with the joins already made. I added columns on the csv for each of the fields i'm intending to append.
I also tried spatial joins as per this however it says the layers aren't the same CRS (I checked, they are), then gets to 15% and hangs.
I also also tried spatial join through mmqgis but it hit a python error. I can try this again and look to debug the problem if this is the right way to go.
In short: appending polygon data as fields on a points-grid csv: what's the best way in QGIS 2.0?