Re: grib

Patrick,

The CONDUIT data is not modified from what is on the NWS data servers.
The GRIB products are sent as individual products rather than a single
file, but nothing is modified internal to he CONDUIT adta contents.
If you want to compare the contents of the 0.5 degree CONDUIT
data to NCEP files, simply FILE the data from the LDM, rather than
decoding it, and then re-converting back to grib.

Steve Chiswell
Unidata User Support


On Fri, 2006-04-28 at 11:49, Patrick L. Francis wrote:
gembuds... prolly for chiz...

the 0.5deg gfs conduit feeds
seem to be missing .5 deg of
data as compared to the raw
files downloaded via ncep... is
there any way around this?

i.e. note the error (s) when using
standard gdgrib2 then degrib

[ldm@beast bin]$ ./degrib -in chizgrib_F003.pgrb2 -P -Interp 2 -Separator \",\" -Unit m -pntStyle 0 -pntFile places.txt -out chiz.txt
ERROR: In call to GRIB2Probe.
ERROR: Sect3 was not Valid.
Projection code requires Dx (0.000000) > 0 and Dy (0.500000) > 0
ERROR: In call to GRIB2Probe.
(null)
[ldm@beast bin]$

PDS-S0 | DataType | 0 (Meteorological products)
PDS-S1 | Originating center | 7 (US-NCEP)
PDS-S1 | Originating sub-center | 255
PDS-S1 | GRIB Master Tables Version | 2
PDS-S1 | GRIB Local Tables Version | 1
PDS-S1 | Significance of reference time | 1 (Start of Forecast)
PDS-S1 | Reference Time | 04/27/2006 18:00:00 UTC
PDS-S1 | Operational Status | 0 (Operational products)
PDS-S1 | Type of Data | 1 (Forecast products)
PDS-S4 | Product type | 0 (Analysis at a horizontal layer at a point in time)
PDS-S4 | Category Description | 0 (Temperature)
PDS-S4 | Category Sub-Description | 0 (Temperature [K])
PDS-S4 | Output grid, (COMPUTED) english unit is | [F]
PDS-S4 | Generation process | 255 (Missing)
PDS-S4 | Forecast time in hours | 3.000000
PDS-S4 | Type of first fixed surface | 102 (Specific altitude above mean sea level [m])
PDS-S4 | Value of first fixed surface | 2.000000
GDS | Number of Points | 259920
GDS | Projection Type | 0 (Latitude/Longitude)
GDS | Shape of Earth | sphere
GDS | Radius | 6371.200000 (km)
GDS | Nx (Number of points on parallel) | 720
GDS | Ny (Number of points on meridian) | 361
GDS | Lat1 | -90.000000
GDS | Lon1 | 0.000000
GDS | u/v vectors relative to | easterly/northerly
GDS | Lat2 | 90.000000
GDS | Lon2 | 0.000000
GDS | Dx | 0.000000 (degrees)
GDS | Dy | 0.500000 (degrees)
GDS | Input GRIB2 grid, scan mode | 64 (0100)
GDS | Output grid, scan mode | 64 (0100)
GDS | (.flt file grid), scan mode | 0 (0000)
GDS | Output grid, scan i/x direction | positive
GDS | Output grid, scan j/y direction | positive
GDS | (.flt file grid), scan j/y direction | negative
GDS | Output grid, consecutive points in | i/x direction
GDS | Output grid, adjacent rows scan in | same direction
Info | Packing that was used | 0 (Grid point data - simple packing)
Info | Original field type | 0 (Floating point)
Info | Missing value management | 1 (Primary missing value included with data)
Info | Primary missing value | 9999.000000
Info | Detected number of Missing | 1440
Info | Field minimum value | -72.670000
Info | Field maximum value | 105.530000

------------------------------
Patrick L. Francis
Department of Geography
Bowling Green State University
Bowling Green, OH 43403
Phone: 419.372.4185
web: http://weather.bgsu.edu/
-----------------------------



  • References:
    • grib
      • From: Patrick L. Francis