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[Support #ARA-684823]: ADDE access to remote servers

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [Support #ARA-684823]: ADDE access to remote servers
  • Date: Sun, 25 Mar 2007 16:59:27 -0600
Hi Julia,

re:
> My understanding is that CAL block is needed in order to convert the
> digital counts to meaningful values, such as radiance, reflectance, etc.
> That is why I am looking for the McIDAS command to retrieve the CAL block.
> Am I right?

You are correct that the CAL block is needed to convert the digital counts
to calibrated values _if_ the image is not already calibrated.  For instance,
the images sent in the Unidata-Wisconsin datasetream are already precalibrated.
The end user (you) do not need to worry about doing the calibration.

Also, for RAW images, the calibration block is contained in the AREA file
holding the image.  McIDAS commands use that calibration information to output
calibrated data values.

By the way, in addition to or replacement for AXFORM, you may want to 
investigate
use of the IMGPROBE command.

Cheers,

Tom
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Ticket Details
===================
Ticket ID: ARA-684823
Department: Support McIDAS
Priority: Normal
Status: Closed