This behavior will happen if the image and the points are not in the same geographical space. It looks like your points are in x,y which is ok if they are points taken from the image. But are the x,y locations the same samples and lines from the image (i.e. is your image large enough to contain points in those locations)?

Hi Mari, Thanks for replying. Yes, the points were taken from the image. What I did was take a study area (subset from roi) from a larger image and then used the pixel locator/Point collector to confirm the bounding X,Y (samples/lines) points of the study area. then generated the random samples in the ascii file. So all points are within the study area (I have even tried using the full image, and still no display). I am using this method as I could not find a function within ENVI that would generate (and display) a specified number of random pixels within an image. Would you happen to know if a function to do this is available, as it will bypass the need to load a separate file? Thanks Simon

There is a generate random sample tool in the Post Classification tools in ENVI. I really don't know why your points would not show up given the information you have provided. I would suggest you contact ITT Technical Support directly about the issue.

Hi Mari, I even tried loading the points as a shapefile and they wouldn't display! (Different versions and different pc's). Thanks for the help. I will contact tech support. Simon