Counting unique points within a polygon

[AndrewDay]

Hi,

A request from an ecologist has turned into a bit of a mission for me. I'm looking to count the number of unique points within a polygon. This is to assess the number of unique species sightings within an area and not just the total number of sightings. Surely there is an easy way to do this at the desktop level? I can do it at the DB level but want to leave the ecologist with a method they are comfortable with.

Thanks!
Andy, Dublin, Ireland

[AdamInglis]

I'm looking for pretty much the same thing.  The ability to count the points within a polygon.  I have a feature class with 150 polygons and each polygon contains 250 to 1500 points.  I want to write the point count for each polygon to a new field for the polygon.  I have an idea of how to do this programmatically but I was hoping for a less time consuming solution.