If I draw a polygon around an area, at what level of precision does the system search for data? Background - people load data to our activity at varying levels of accuracy of OS grid reference. I drew a polygon around a particular area to search for data and it missed some of it which had been recorded as only 4 fig grid ref. The polygon lies within the 1 km square of that grid ref. So do polygons only pick up data for which the lower left hand corner of the grid ref lies within the polygon? or how do they work?
