GEMPAK Support for GOES ABI NetCDF
GOES16 and GOES17 ABI products are distributed in NetCDF4 formatted files, and GEMPAK as of release 7.5.1 can now read and display these products in their native formats (it is no longer needed to convert netCDF to McIDAS area format to display in GEMPAK).
For Full Disk and CONUS sectors, GOES16 and GOES17 ABI products are sent across the Satellite Broadcast Network as tiles, each contributing to a "mosaic" of a full sector scan. The Unidata Program Center has provided an alternate data feed in which all tiles are "stitched" together (thanks to the program ldm-alchemy).
To request these stitched images, add the following request line to your ldmd.conf:
# Unidata ldm-alchemy
REQUEST NIMAGE "GOES" lead.unidata.ucar.edu
The following pattern action
EXP ^/data/ldm/pub/native/satellite/GOES/(.*)/([^/]*)/([^/]*)/([0-9]{8})/GOES(16|17)_([^/]*)_([0-9]{8})_([0-9]{4})(..)_([^/]*).nc4
FILE -close /data/ldm/gempak/images/sat/\1/\2/\3/\3_\7_\8
will create files such as :
$SAT/GOES16/CONUS/Channel02/Channel02_20181227_1812
$SAT/GOES16/CONUS/Channel08/Channel08_20181227_1812
$SAT/GOES16/CONUS/Channel13/Channel13_20181227_1942
for each of the 16 ABI channels (here the environmental variable SAT = /data/ldm/gempak/images/sat/) and each available sector (e.g. CONUS above).
The above pqact.conf entry will write images to directories in $SAT, which are then selectable in NMAP2 > New Data Source > Image
- as seen above there is still a map projection error for GOES17 Full Disk images.
