The GeoColor data formerly on the IDD has been discontinued for IDD
delivery. The intense processing and research that went into the product
was carried out external to Unidata at CIRA/CSU, and was delivered for IDD
inclusion for the use of NWS offices. That processing can now occur at the
individual NWS offices, and resources to continue the generation of
GeoColor are no longer available.
The ability to create GeoColor images is provided by the delivery of the
constituent channels of GOES data on the IDD and via SBN ground stations.
For instance, this peer reviewed article provides the algorithm for
creating a "true" color image in the absence of a green channel:
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018EA000379
Another source is from the authors of GeoColor:
https://journals.ametsoc.org/downloadpdf/view/journals/atot/37/3/JTECH-D-19-0134.1.pdf
These publications are provided to enable receivers of IDD data, or SBN
data from a ground station, to create their own version of a "GeoColor"
product.
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Stonie Cooper, PhD
Software Engineer III
NSF Unidata
cooper@xxxxxxxx