Resolve off-disk HCAST sentinel value concerns
We still have an issue where some bands in HCAST show off-disk pixels as being very low radiance instead of being missing; this is not the case for all HCAST.
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review HRIT docs http://www.data.jma.go.jp/mscweb/en/operation/sample/JMA_HRIT_Issue1.2.pdf -
review HRIT reader code regarding off-disk sentinel values -
fix or confirm "works as required"