I'm working with an inventory of a species in Southern Sweden. I have recorded my findings (together with coordinates, name of the species and year of finding) and created a CSV-file with i have imported to QGIS.
Example from my data
Decade;species;ort;lat,long 1880;falcata;Borgholm;56.882657,16.655931 1880;falcata;Algutsrum;56.674716,16.53471 1880;falcata;Borgholm;56.882657,16.655931
In order to make a map that's easy to grasp I would like to collect all findings from e.g 1890 into an area, all findings from 1900 into a second area an so on. Someone that have a clue on what I can to to achieve this?