[QUOTE]anuva wrote hello I am new to IDL and would appretiate your help reagrding the plotting of hdf satellite data. I could read the different attributes with a IDL program provided. Now I need to write those data in ASCII in a separate output file and plot the latitude and longitude on a world map. It would be great if someone will provide me in detail how do I do this.. Thankx in advance       [/QUOTE]