[thredds] HTTPServer does not apply NcML changes to your data

Aloha TDS Folks,
This is a general word of caution that downloading data via the "HTTPServer"
link in TDS does *not* apply any NcML changes. This is a straight download
of the files from your disk server without aggregation or alteration of any
kind. Although you may have (and in some cases painstakingly so) defined
several NcML changes in your config files that make your data CF compliant,
add global metadata attributes, or other fixes, these changes only get
applied to your data when downloading them via one of the other TDS data
services, such as: OPeNDAP, NetCDF Subset Service (NCSS), WMS, or WCS. If
you require NcML changes, it is probably best advised to turn off the "http"
service in your config file to avoid having two avenues to your archive: one
with the changes and one without, which can lead to confusion or
difficulties importing your data into other applications. We tend to leave
ours on despite this peril for the sake of those users who may not
understand how to use OPeNDAP, especially for non-gridded datasets who don't
yet have a simple NetCDF download mechanism in TDS like the NetCDF Subset
Service. Is there any possibility of modifying HTTPServer to apply NcML in
the future? Just curious.
John Maurer
Pacific Islands Ocean Observing System (PacIOOS)
University of Hawaii at Manoa
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