I have a couple of different sets of datapoints (8,000-20,000 pts) that measure chemical parameters such as conductivity and pH that i'm trying to run IDW on. I have made a polyline barrier that was originally a polygon file that i converted to polyline file by feature to line. I have made sure all of my points are within the polyline barrier. I i'm using the default output cell size and the search radius is 12 points. My problem is that when i run the IDW it gets to a 100% and just keeps running. I thought maybe it would take a couple of days, but its been like 4 days on the dataset with only 8,000 points and still just says 100%. I have tried running it on different computers also. Do you have any suggestions about how to fix my problem? thanks!