[gradsusr] can't open IBTraCS nc file
Marcelino II Villafuerte
mqvillafuerte at gmail.com
Tue Jan 3 23:29:30 EST 2012
Dear All,
Has anyone successfully opened IBTraCS file in GrADS? I have recently found
about this typhoon data archive combining different agencies best track in
a netcdf file format, the data is downloadable in this link:
ftp://eclipse.ncdc.noaa.gov/pub/ibtracs/v03r03/wmo/netcdf/year/
However, when I tried to open it in GrADS 2.0.1, I received this error:
*ga-> sdfopen Year.1901.ibtracs_wmo.v03r03.nc
Scanning self-describing file: Year.1901.ibtracs_wmo.v03r03.nc
gadsdf: SDF file has no discernable X coordinate.
To open this file with GrADS, use a descriptor file with an XDEF entry.
Documentation is at http://iges.org/grads/gadoc/SDFdescriptorfile.html*
I tried to read the documentation given above but I still can't figure out
how to make a descriptor file for the said file. ncdump gives the following
details about the file:
dimensions:
storm = UNLIMITED ; // (16 currently)
time = 137 ;
ncharsn = 13 ;
ncharnm = 55 ;
center = 24 ;
ncharcn = 10 ;
variables:
char storm_sn(storm, ncharsn) ;
storm_sn:long_name = "Storm serial number" ;
char name(storm, ncharnm) ;
name:long_name = "Storm name" ;
short numObs(storm) ;
numObs:long_name = "Number of observations for the storm" ;
short season(storm) ;
season:long_name = "Year based on season" ;
season:Note = "Following WMO,\n",
"NH Seasons begin 1 January and \n",
"SH Seasons begin 1 July the prior year" ;
byte track_type(storm) ;
track_type:long_name = "Track type" ;
track_type:key = "0 = main - cyclogenesis to cyclolysis\n",
"1 = merge - cyclogenesis to merger\n",
"2 = split - split to cyclolysis\n",
"3 = other - split to merger" ;
byte genesis_basin(storm) ;
genesis_basin:long_name = "Basin of genesis" ;
genesis_basin:units = " " ;
genesis_basin:key = "0 = NA - North Atlantic\n",
"1 = SA - South Atlantic\n",
"2 = WP - West Pacific\n",
"3 = EP - East Pacific\n",
"4 = SP - South Pacific\n",
"5 = NI - North Indian\n",
"6 = SI - South Indian\n",
"7 = AS - Arabian Sea\n",
"8 = BB - Bay of Bengal\n",
"9 = EA - Eastern Australia\n",
"10 = WA - Western Australia\n",
"11 = CP - Central Pacific\n",
"12 = CS - Carribbean Sea\n",
"13 = GM - Gulf of Mexico\n",
"14 = MM - Missing" ;
genesis_basin:Note = "Based on where the storm began" ;
byte num_basins(storm) ;
num_basins:long_name = "Number of basins through which the
storm passes" ;
num_basins:units = " " ;
byte basin(storm, time) ;
basin:long_name = "Basin" ;
basin:units = " " ;
basin:key = "0 = NA - North Atlantic\n",
"1 = SA - South Atlantic\n",
"2 = WP - West Pacific\n",
"3 = EP - East Pacific\n",
"4 = SP - South Pacific\n",
"5 = NI - North Indian\n",
"6 = SI - South Indian\n",
"7 = AS - Arabian Sea\n",
"8 = BB - Bay of Bengal\n",
"9 = EA - Eastern Australia\n",
"10 = WA - Western Australia\n",
"11 = CP - Central Pacific\n",
"12 = CS - Carribbean Sea\n",
"13 = GM - Gulf of Mexico\n",
"14 = MM - Missing" ;
basin:Note = "Based on present location" ;
basin:_FillValue = -127b ;
byte wind_avg_period(center) ;
wind_avg_period:long_name = "Wind speed averaging period" ;
wind_avg_period:units = "min" ;
wind_avg_period:_FillValue = -127b ;
char source(center, ncharcn) ;
source:long_name = "Source name" ;
source:Note = "This order matches the dimension in source_*
variables" ;
double time_wmo(storm, time) ;
time_wmo:long_name = "Modified Julian Day" ;
time_wmo:units = "days since 1858-11-17 00:00:00" ;
time_wmo:_FillValue = 9.96921e+36 ;
short lat_wmo(storm, time) ;
lat_wmo:long_name = "Storm center latitude" ;
lat_wmo:units = "degrees_north" ;
lat_wmo:scale_factor = 0.01f ;
lat_wmo:_FillValue = -32767s ;
short lon_wmo(storm, time) ;
lon_wmo:long_name = "Storm center longitude" ;
lon_wmo:units = "degrees_east" ;
lon_wmo:scale_factor = 0.01f ;
lon_wmo:_FillValue = -32767s ;
byte alt(storm, time) ;
alt:long_name = "Altitude" ;
alt:units = "m" ;
alt:_FillValue = -127b ;
alt:note = "only included in an attempt to have THREDDS
recognize the file as a trajectory" ;
short wind_wmo(storm, time) ;
wind_wmo:long_name = "Maximum Sustained Wind (MSW)" ;
wind_wmo:units = "kt" ;
wind_wmo:scale_factor = 0.1f ;
wind_wmo:_FillValue = -32767s ;
short pres_wmo(storm, time) ;
pres_wmo:long_name = "Minimum Central Pressure (MCP)" ;
pres_wmo:units = "mb" ;
pres_wmo:scale_factor = 0.1f ;
pres_wmo:_FillValue = -32767s ;
byte sub_basin(storm, time) ;
sub_basin:long_name = "Sub-Basin" ;
sub_basin:units = " " ;
sub_basin:key = "0 = NA - North Atlantic\n",
"1 = SA - South Atlantic\n",
"2 = WP - West Pacific\n",
"3 = EP - East Pacific\n",
"4 = SP - South Pacific\n",
"5 = NI - North Indian\n",
"6 = SI - South Indian\n",
"7 = AS - Arabian Sea\n",
"8 = BB - Bay of Bengal\n",
"9 = EA - Eastern Australia\n",
"10 = WA - Western Australia\n",
"11 = CP - Central Pacific\n",
"12 = CS - Carribbean Sea\n",
"13 = GM - Gulf of Mexico\n",
"14 = MM - Missing" ;
sub_basin:Note = "Based on present location" ;
sub_basin:_FillValue = -127b ;
byte nature_wmo(storm, time) ;
nature_wmo:long_name = "Storm nature" ;
nature_wmo:key = "0 = TS - Tropical\n",
"1 = SS - Subtropical\n",
"2 = ET - Extratropical\n",
"3 = DS - Disturbance\n",
"4 = MX - Mix of conflicting reports\n",
"5 = NR - Not Reported\n",
"6 = MM - Missing\n",
"7 = - Missing" ;
nature_wmo:Note = "Based on classification from original
sources" ;
nature_wmo:_FillValue = -127b ;
byte source_wmo(storm, time) ;
source_wmo:long_name = "Source used as WMO agency" ;
source_wmo:flag_values = "0 1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23" ;
source_wmo:flag_meanings = "hurdat_atl td9636 reunion atcf
ds824_sh ds824_ni bom ds824_au jtwc_sh jtwc_wp ds824_wp jtwc_io cma
hurdat_epa jtwc_ep ds824_ep jtwc_cp tokyo neumann hko cphc wellington
newdelhi nadi" ;
source_wmo:_FillValue = -127b ;
// global attributes:
:Title = "IBTrACS-WMO: NetCDF reformat" ;
:Version = "v03r03" ;
:Description = "IBTrACS-WMO data reformatted to contain \n",
"all data in one netCDF file. Also an attempt has
been made\n",
"to have the data appear as trajectories in the
CDM" ;
:cdm_datatype = "Trajectory" ;
:trajectoryDimension = "storm" ;
:Conventions = "CF-1.0" ;
}
Sorry for the long mail. Thanks in advance for any help..
Best regards,
Mar
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