Topic: Bug in NBN distribution maps?
The attached file (original bug) shows the distribution map for Quercus cerris. I'm using the grid map page - https://data.nbn.org.uk/Taxa/NBNSYS0000003843/Grid_Map
I've set the date ranges (from the top) to 1600 to 1990 (red), then 1991 to 2017 (ornage); finally I added a base layer of 1600 to 1990 (yellow) to show the full data.
My expectation was that all the records would be picked up by one of the first two searches so the map would show no yellow, but this is clearly not the case.