This Walking or moving grib can move in boat's direction & speed, is under 10 kb, has 4 x 6 degree area, 1/2 degree resolution,
3 hrs up to 1 1/2 days, then 6 hrs up to 2 days, then 12 hrs up to 6 days.
, Message: GFS line below, Subj: grib.
File: Lat Long info | Grid | Time Interval | Data | Speed, Direction GFS:42N,38N,070W,076W|0.5,0.5|6,9..18,24..48,60..1 44|WIND|4.5,079
Leave NO SPACES between! eg: |6(comma)9(dot)(dot)18(comma)24
File: Targets file type request.
GFS is typical wind
wave file from NOAA often all that is needed.
Lat Long info: 4 x 6 or 6 x 4 is pretty good.
42N,38N 4 degrees
070W,076W 6 degrees
Grid this is the resolution of the grib information.
0.5,0.5 is 1/2 x 1/2 degree - the finest resolution available.
1,1 is 1 x 1 degrees
2,2 is 2 x 2 degrees
When you have as small an area as we have selected, you need the 0.5,0.5
Time Interval by components:
0, no zero shown because we know the wind
, now, save kb.
6,9 sets increment to 3 hours (smallest allowed) 9 - 6 = 3 hours.
6,9..18 repeat 3 hr from 6 to 18 hrs. 18 - 9 = 9 hrs, 9/3 =3<--must be integer.
18,24 sets increment to 6 hours. 24 - 18 = 6 hrs.
18,24..48 then repeat 6 hr from 18 to 48 hrs, 48 - 24 = 24 , 24 = 6 x 4<-- integer, no fraction.
48,60 sets increment to 12 hrs. 60 - 48 = 12 hrs.
48,60..144 then repeat 12 hr from 48 hr to 144 hr
Data Types - used to select which data types you want
Speed, Direction - Creates the walking or moving grib
4.5,079 Speed in knots, bearing in degrees approximating the boat path.
Winlink grib saildoc file attachments can by up to 12 kb. The WIND grib file above is 9kb. It would be very nice to be able to request separate but identical gribs for PRESS, WAVES and CAPE and be able to combine therm easily for ease of use.
Does anyone have a suggestion as to how to do this? If there is an msdos command that will concatenate two files??? I could then build a batch file calling 9 kb files WIND.grb, PRESS.grb, WAVES.grb, CAPE.grb and just run that?
I think this capability would be very useful for receiving smaller single
data type SSB
grib files, and then joining them easily.
PS Pitzef has been working marvels with the moving grib request capability and in many other ways on this pluign which keeps getting betrre. Thank you!
I am not necessarily asking for feature in the grib_pi at this point, I'd just like to figure out a way to do this before June, via use of a small batch file or something, so I can pull small <10 kb files with single
but different data types together into a single file.
PS: This stuff is really working nicely now.