I'm very new to QGIS. I have a problem related to the "select by location" tool of QGIS.
I have loaded 10 different layers into my map containing data of waters (rivers, canals etc.). Now, I want to classify my own data, consisting of ID's with latitude/longitude, as "on land" or "on water". I have chosen the intersect function of QGIS to solve this problem. However, my data contains millions of datapoints which causes the process to be very slow. I have checked the "Use only selected features" checkbox, and the plan is to repeat this step for every single layer. The first layer is "creating a new selection", the next layers should be "add to current selection". Now, the problem is that it takes more than 1 hour for the first layer already. Is there a way to speed up the process? Or I am doing something wrong?