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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
I suspect those are "raw" count values. If you are getting the data through an ADDE server, then the IDV Chooser will allow you to specify a conversion to brightness temperature. If you are reading the files off your local disk, then you must live with the units that the files were originally copied with.... For probing, you can either use the "Probe" display type (in the Field Selector, look in the Display panel -- you would just "redisplay" your image with the desired probe). Or.....if you have a 3-button mouse, simply hold the center button down while you move over the image and a readout will appear in the upper left of the image. One word of caution: you probably will want to set your Preferences to "nearest neighbor sampling" -- this way, you will get the value of the pixel; the other sampling mode will interpolate from the pixel centers to the location of the pointer. tom On Thu, Mar 26, 2009 at 2:29 PM, Caitlin Hart <chart2@xxxxxxxxxxxxx> wrote: > Hello, > I have AREA files of satellite imagery from the GOES imager and sounder. When > I load the images in IDV I get a range of values from 3680-8000 (for Imager > channel 2)and 8864-17184 (for channel 4 file). This is obviously not > brightness temperature, but I can not find any clear documentation about what > the units of these values are or how to convert them to brightness > temperature. Can I do the conversion in IDV? > > Also, is there a way to find individual pixel values? i.e. in AWIPS you can > mouse over and image and a little tag pops up with the value of the pixel > you're hovering over. Is there an analogous feature in IDV? > > Thank you, > Caitlin Hart > SUNY Brockport Meteorology > > _______________________________________________ > idvusers mailing list > idvusers@xxxxxxxxxxxxxxxx > For list information, to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ > -- Tom Whittaker University of Wisconsin-Madison Space Science & Engineering Center (SSEC) Cooperative Institute for Meteorological Satellite Studies (CIMSS) 1225 W. Dayton Street Madison, WI 53706 USA ph: +1 608 262 2759
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