>From: Darren Gallant <address@hidden> >Organization: UCAR/JOSS >Keywords: 200207111918.g6BJIGa29261 McIDAS AREA calibation Darren, re: If there is no noise in the image, space would produce zero counts the sensor. This will translate to zero brightness, zero albedo, etc. >So, this correction is made when the image is ingested and an areafile is >created. I am not certain about what you mean by "correction". If the sensor were perfect, the number of counts would be zero and everything from that point on that is a function of the counts (like brightness, albedo, etc.) would also be zero. >I'm a little confused here. I am confused about your question because I don't really understand what you are trying to accomplish. In the more real case of sensor counts never being zero, values less than some point might be interpreted as noise. I suppose that one could set the brightness values to zero, but I don't believe that McIDAS satellite ingesters do that. I think that they will interpret the data as being some valid value leaving it up to the user to remember that the instrument is not perfect. >Are there references to this process? Not that I know of. >I want to replicate this procedure and test the results. Replicate which procedure? Tom
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