I am attempting to map out, in a 10x10 km grid, the occurrence of unique plant species. I have used the "Points in Polygon" feature to count and map the unique points across the grid, however I have a new need. I have a .csv file with >100,000 observations of plants, and I want to count how many grid squares each plant species occupies, but only count it once for each grid square. So say I have 200 total 10x10 km grid squares I want to be able to say "Species A occupies 10 different 10x10 km grids, Species B 100 different... etc.
At the moment my map looks like the below:
I am using QGIS v. 3.0.3