I am trying to make a heat map of every town in my state. After joining my data (a .csv) to the shapefile, the column I need to map is not visible on the graduated color option under Symbology.
I have read many responses to similar questions here, but none of them have worked for me. Changing the .csv to a .csvt or .txt or other file type does not work.
I also saw posts that it was recommended to convert using the Field Calculator ... but the message says, "This layer does not support adding new provider fields. You can only add virtual fields."
I somehow need to get the data file to be read as integers, not text, if I am correct. However, 12 columns are available to be mapped on my .csv file ... just not the joined column that I need. So I am quite confused.
FWIW, under Symbology, the correct column DOES appear when I tried to map by "categorized," but that is not what I need to do, I need it "graduated."