Re: [idvusers] viewing pixel values of images in IDV

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.


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
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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