John,
This is the first time ive seen anything in the GRIB2 local use section,
so I havent dealt with this problem before. Below is a dump of the LUS
bytes for the file you sent, one for each GRIB record. Format is PDS
offset == LUS bytes.
I wanted to know if these vary by record, which as you can see, some are
the same and some not. What is the "weather string table" anyway ?
Anyway, without specialized code like degrib its impossible to make more
meaning of it, but Im thinking about how to allow access to the raw
bytes through the CDM interface.
According to the NDFD website, they use the LSU as a lookup table. It
maps an integer to a string. For one product, integer 1 maps to "AS.Y"
and for another product, integer 1 maps to "SC.Y". The data stored in
the data section is the integer data. Using the table in the LSU, you
know what the 1's mean. The meaning changes based on what weather
alerts are currently issued. I've seen some LSU only have 8 items in it
and other with 20. "AS.Y" and "SC.Y" have their own meanings, which are
outlined on the NDFD site - those don't change.
--
=======================================================================
Jeff Brogden CIMMS/OU
Jeff.Brogden@xxxxxxxx
