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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi Gordon- Gordon Carrie wrote:
Hi folks, I need to view Sigmet Raw products in IDV. These are Sigmet's equivalent of Level II files. I see two options: 1) Adapt the programs for reading WSR88D Level II files in /metapps/ucar/unidata/data/radar.
This would probably be your best bet. I'd create a SigmetRadarDataSource that handles that format. You might be able to leverage some of the other classes in that package.
2) Convert the Sigmet files to NetCDF. I see source code for reading radar data from NetCDF files in NetcdfRadarDataSource.java and NetcdfSweepfileAdapter.java, but I cannot find the format for the NetCDF files it reads (i.e. metadata, variable and dimension names, etc.). Does anyone know where I can find this specification? Output from ncdump on a sample file would be sufficient.
The NetcdfSweepfileAdapter is that actual data munger that NetcdfRadarDataSource uses. An example CDL is attached. This is a format used by NCAR for their SPOL radar.
If I don't hear anything, I will proceed with option 1. Stay tuned.
I think that's the best option. Good luck! Don ************************************************************* Don Murray UCAR Unidata Program dmurray@xxxxxxxxxxxxxxxx P.O. Box 3000 (303) 497-8628 Boulder, CO 80307 http://www.unidata.ucar.edu/staff/donm "There's someone in my head, but it's not me" Roger Waters *************************************************************
netcdf ncswp_SPOL_20000705_234939.847_v1_s8_59.0_RHI_ {
dimensions:
Time = UNLIMITED ; // (41 currently)
maxCells = 1008 ;
numSystems = 1 ;
variables:
int base_time ;
base_time:long_name = "Unix Date/Time value for first record" ;
base_time:units = "seconds since 1970-01-01 00:00 UTC" ;
base_time:_FillValue = 0 ;
float Fixed_Angle ;
Fixed_Angle:long_name = "Targeted fixed angle for this scan" ;
Fixed_Angle:units = "degrees" ;
Fixed_Angle:_FillValue = 0.f ;
float Range_to_First_Cell ;
Range_to_First_Cell:long_name = "Range to the center of the
first cell" ;
Range_to_First_Cell:units = "meters" ;
Range_to_First_Cell:_FillValue = 0.f ;
float Cell_Spacing ;
Cell_Spacing:long_name = "Distance between cells" ;
Cell_Spacing:units = "meters" ;
Cell_Spacing:_FillValue = 0.f ;
float Nyquist_Velocity ;
Nyquist_Velocity:long_name = "Effective unambigous velocity" ;
Nyquist_Velocity:units = "meters/second" ;
Nyquist_Velocity:_FillValue = 0.f ;
float Unambiguous_Range ;
Unambiguous_Range:long_name = "Effective unambigous range" ;
Unambiguous_Range:units = "meters" ;
Unambiguous_Range:_FillValue = 0.f ;
double Latitude ;
Latitude:long_name = "Latitude of the instrument" ;
Latitude:units = "degrees_north" ;
Latitude:valid_range = -90.f, 90.f ;
Latitude:missing_value = -999.f ;
Latitude:_FillValue = -888. ;
double Longitude ;
Longitude:long_name = "Longitude of the instrument" ;
Longitude:units = "degrees_east" ;
Longitude:valid_range = -360.f, 360.f ;
Longitude:missing_value = -999.f ;
Longitude:_FillValue = -888. ;
double Altitude ;
Altitude:long_name = "Altitude in meters (asl) of the
instrument" ;
Altitude:units = "meters" ;
Altitude:valid_range = -10000.f, 90000.f ;
Altitude:missing_value = -99999.f ;
Altitude:_FillValue = -88888. ;
float Radar_Constant(numSystems) ;
Radar_Constant:long_name = "Radar constant" ;
Radar_Constant:units = "???" ;
Radar_Constant:_FillValue = 0.f ;
float rcvr_gain(numSystems) ;
rcvr_gain:long_name = "Receiver Gain" ;
rcvr_gain:Comment = "Most entries are 2 dimension arrays one
for each polarity" ;
rcvr_gain:units = "db" ;
rcvr_gain:missing_value = -999.f ;
rcvr_gain:_FillValue = -888.f ;
float ant_gain(numSystems) ;
ant_gain:long_name = "Antenna Gain" ;
ant_gain:units = "db" ;
ant_gain:missing_value = -999.f ;
ant_gain:_FillValue = -888.f ;
float sys_gain(numSystems) ;
sys_gain:long_name = "System Gain" ;
sys_gain:units = "db" ;
sys_gain:missing_value = -999.f ;
sys_gain:_FillValue = -888.f ;
float bm_width(numSystems) ;
bm_width:long_name = "Beam Width" ;
bm_width:units = "degrees" ;
bm_width:missing_value = -999.f ;
bm_width:_FillValue = -888.f ;
float pulse_width(numSystems) ;
pulse_width:long_name = "Pulse Width" ;
pulse_width:units = "seconds" ;
pulse_width:missing_value = -999.f ;
pulse_width:_FillValue = -888.f ;
float band_width(numSystems) ;
band_width:long_name = "Band Width" ;
band_width:units = "hertz" ;
band_width:missing_value = -999.f ;
band_width:_FillValue = -888.f ;
float peak_pwr(numSystems) ;
peak_pwr:long_name = "Peak Power" ;
peak_pwr:units = "watts" ;
peak_pwr:missing_value = -999.f ;
peak_pwr:_FillValue = -888.f ;
float xmtr_pwr(numSystems) ;
xmtr_pwr:long_name = "Transmitter Power" ;
xmtr_pwr:units = "dBm" ;
xmtr_pwr:missing_value = -999.f ;
xmtr_pwr:_FillValue = -888.f ;
float noise_pwr(numSystems) ;
noise_pwr:long_name = "Noise Power" ;
noise_pwr:units = "dBm" ;
noise_pwr:missing_value = -999.f ;
noise_pwr:_FillValue = -888.f ;
float tst_pls_pwr(numSystems) ;
tst_pls_pwr:long_name = "Test Pulse Power" ;
tst_pls_pwr:units = "dBm" ;
tst_pls_pwr:missing_value = -999.f ;
tst_pls_pwr:_FillValue = -888.f ;
float tst_pls_rng0(numSystems) ;
tst_pls_rng0:long_name = "Range to start of test pulse" ;
tst_pls_rng0:units = "meters" ;
tst_pls_rng0:_FillValue = 0.f ;
float tst_pls_rng1(numSystems) ;
tst_pls_rng1:long_name = "Range to end of test pulse" ;
tst_pls_rng1:units = "meters" ;
tst_pls_rng1:_FillValue = 0.f ;
double time_offset(Time) ;
time_offset:long_name = "time offset of the current record from
base_time" ;
time_offset:units = "seconds" ;
time_offset:_FillValue = 0. ;
float Azimuth(Time) ;
Azimuth:long_name = "Earth relative azimuth of the ray" ;
Azimuth:Comment = "Degrees clockwise from true North" ;
Azimuth:units = "degrees" ;
Azimuth:valid_range = -360.f, 360.f ;
Azimuth:missing_value = -999.f ;
Azimuth:_FillValue = -888.f ;
float Elevation(Time) ;
Elevation:long_name = "Earth relative elevation of the ray" ;
Elevation:Comment = "Degrees from earth tangent towards zenith"
;
Elevation:units = "degrees" ;
Elevation:valid_range = -360.f, 360.f ;
Elevation:missing_value = -999.f ;
Elevation:_FillValue = -888.f ;
short DBZ(Time, maxCells) ;
DBZ:long_name = "Reflectivity factor" ;
DBZ:units = "dBz" ;
DBZ:scale_factor = 0.01f ;
DBZ:add_offset = 0.f ;
DBZ:missing_value = -32768s ;
DBZ:_FillValue = -32768s ;
DBZ:polarization = "Horizontal" ;
DBZ:Frequencies_GHz = 2.80900001525879 ;
DBZ:InterPulsePeriods_secs = 0.00104149997234344 ;
short ZDR(Time, maxCells) ;
ZDR:long_name = "Polarization_diversity" ;
ZDR:units = "dBm" ;
ZDR:scale_factor = 0.01f ;
ZDR:add_offset = 0.f ;
ZDR:missing_value = -32768s ;
ZDR:_FillValue = -32768s ;
ZDR:polarization = "Horizontal and Vertical" ;
ZDR:Frequencies_GHz = 2.80900001525879 ;
ZDR:InterPulsePeriods_secs = 0.00104149997234344 ;
short LDR(Time, maxCells) ;
LDR:long_name = "Linear Depolarization Ratio" ;
LDR:units = "dBm" ;
LDR:scale_factor = 0.01f ;
LDR:add_offset = 0.f ;
LDR:missing_value = -32768s ;
LDR:_FillValue = -32768s ;
LDR:polarization = "Horizontal" ;
LDR:Frequencies_GHz = 2.80900001525879 ;
LDR:InterPulsePeriods_secs = 0.00104149997234344 ;
short NCP(Time, maxCells) ;
NCP:long_name = "Normalized Coherent Power" ;
NCP:units = "" ;
NCP:scale_factor = 0.01f ;
NCP:add_offset = 0.f ;
NCP:missing_value = -32768s ;
NCP:_FillValue = -32768s ;
NCP:polarization = "Horizontal" ;
NCP:Frequencies_GHz = 2.80900001525879 ;
NCP:InterPulsePeriods_secs = 0.00104149997234344 ;
short VR(Time, maxCells) ;
VR:long_name = "Doppler velocity" ;
VR:units = "meters/second" ;
VR:scale_factor = 0.01f ;
VR:add_offset = 0.f ;
VR:missing_value = -32768s ;
VR:_FillValue = -32768s ;
VR:polarization = "Horizontal" ;
VR:Frequencies_GHz = 2.80900001525879 ;
VR:InterPulsePeriods_secs = 0.00104149997234344 ;
short PHIDP(Time, maxCells) ;
PHIDP:long_name = "Differential Phase" ;
PHIDP:units = "deg." ;
PHIDP:scale_factor = 0.1f ;
PHIDP:add_offset = 0.f ;
PHIDP:missing_value = -32768s ;
PHIDP:_FillValue = -32768s ;
PHIDP:polarization = "Horizontal and Vertical" ;
PHIDP:Frequencies_GHz = 2.80900001525879 ;
PHIDP:InterPulsePeriods_secs = 0.00104149997234344 ;
short RHOHV(Time, maxCells) ;
RHOHV:long_name = "Copolar Cross Correlation" ;
RHOHV:units = "" ;
RHOHV:scale_factor = 0.001f ;
RHOHV:add_offset = 0.f ;
RHOHV:missing_value = -32768s ;
RHOHV:_FillValue = -32768s ;
RHOHV:polarization = "Horizontal and Vertical" ;
RHOHV:Frequencies_GHz = 2.80900001525879 ;
RHOHV:InterPulsePeriods_secs = 0.00104149997234344 ;
short SW(Time, maxCells) ;
SW:long_name = "Spectral width" ;
SW:units = "meters/second" ;
SW:scale_factor = 0.01f ;
SW:add_offset = 0.f ;
SW:missing_value = -32768s ;
SW:_FillValue = -32768s ;
SW:polarization = "Horizontal" ;
SW:Frequencies_GHz = 2.80900001525879 ;
SW:InterPulsePeriods_secs = 0.00104149997234344 ;
short DM(Time, maxCells) ;
DM:long_name = "Reflected power in dBm" ;
DM:units = "dBm" ;
DM:scale_factor = 0.01f ;
DM:add_offset = 0.f ;
DM:missing_value = -32768s ;
DM:_FillValue = -32768s ;
DM:polarization = "Horizontal" ;
DM:Frequencies_GHz = 2.80900001525879 ;
DM:InterPulsePeriods_secs = 0.00104149997234344 ;
short DX(Time, maxCells) ;
DX:long_name = "Crosspole Reflected power in dBm" ;
DX:units = "dBm" ;
DX:scale_factor = 0.01f ;
DX:add_offset = 0.f ;
DX:missing_value = -32768s ;
DX:_FillValue = -32768s ;
DX:polarization = "Horizontal and Vertical" ;
DX:Frequencies_GHz = 2.80900001525879 ;
DX:InterPulsePeriods_secs = 0.00104149997234344 ;
// global attributes:
:Content = "This file contains one scan of remotely sensed
data" ;
:Conventions = "NCAR_ATD-NOAA_ETL/Scanning_Remote_Sensor" ;
:Instrument_Name = "SPOL" ;
:Instrument_Type = "GROUND" ;
:Scan_Mode = "RHI" ;
:Start_Time = "07/05/100 23:49:39.847" ;
:Year = 2000 ;
:Month = 7 ;
:Day = 5 ;
:Hour = 23 ;
:Minute = 49 ;
:Second = 39 ;
:Volume_Number = 1 ;
:Scan_Number = 8 ;
:Num_Samples = 128 ;
:Index_of_horizontal_information = 0 ;
:Project_Name = "STEPS2000" ;
:Production_Date = "Fri Jul 7 13:53:21 2000" ;
:Producer_Name = "NSF/UCAR/NCAR/ATD" ;
:Software = "xltrs" ;
}
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