I'm new to QGIS and couldn't find any answers to this question I had.
I'm importing data from a CSV file into QGIS using Layer > Add Layer > Add Delimited Text Layer. Here are a few lines of sample data:
1,0,-72.27141,42.564782,ATHOL,15 1,1,-72.27141,42.573775,ATHOL,15
1,7,-72.25924,42.573775,ATHOL,15 1,8,-72.25924,42.582768,ATHOL,15
1,12,-72.24707,42.564782,ATHOL,15 1,14,-72.24707,42.582768,ATHOL,15
1,18,-72.2349,42.555789,ATHOL,15 2,21,-72.2349,42.582768,ATHOL,15
2,23,-72.2349,42.600754,ATHOL,15 2,24,-72.2349,42.609747,ATHOL,15
2,34,-72.22273,42.582768,ATHOL,15 2,35,-72.22273,42.591761,ATHOL,15
2,36,-72.22273,42.600754,ATHOL,15 2,37,-72.22273,42.609747,ATHOL,15
I am graphing column 3 as the X-coordinate and column 4 as the Y-coordinate.
However, I would really like to color-code these by column 1 so it is easier to see the groupings on my map. For instance, any coordinate where column 1 = 1 can display a random color (ex. green) and coordinates where column 1 = 2 can display another random color (ex. red).
I kind of found a way to do this, but it is extremely tedious as I have a couple thousand data points and a hundred or so items in column 1.
What I have been doing is going to Properties > Style > changing from Single Symbol to Categorized > setting column to 1 > setting a random color ramp > then add categories and setting their value manually from 1, 2, etc.
Is there an automated way to do this, so I don't have to set hundreds of categories and enter values manually?
Best Answer
You may select the field for which you want to apply the categorized style (for your case, the first field): you select it just below the selector where you choose the categorized style. Once you have done this, you need to set a color ramp and the push the "Classify" button; then, you only need to push the apply button.