i'm trying to layout a map in ArcGIS09, showing samplings in a specific region: i have a layer with samplings on different sampling dates and sites. sometimes, there are several samples at one site, done at different dates.
the attribute i want to layout is the population structure (very good, good, moderate, poor, bad), which is easy. but now, i would like to sort the points in a way, that the older sampling dates are hidden by the more recent ones. and it would be even nicer, to layout the older sampling dates bigger than the more recent one, in a way that they are still visible below...
is this possible in any way?
thanks a lot for your help!