I have a series of points with various fields in the attribute table, including a
car_id. I also have several polygons in which some of these points are located.
I want to count how many unique
car_id's occur in each polygon. For example, if there are multiple points in a polygon where
car_id = 25, the
car_id = 25 should be counted once. The
car_id count for a polygon using the sample data below should be 4.
car_id = 25 car_id = 25 car_id = 25 car_id = 22 car_id = 22 car_id = 23 car_id = 24
What is the best approach to achieve this? Or is there an appropriate QGIS tool available in QGIS 3 to do this?
I know that in QGIS 2.x the tool 'Count Unique Points In Polygon' would have worked. However this tool is not available anymore in QGIS 3.10.