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20050103: IDV - flight tracks

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  • Subject: 20050103: IDV - flight tracks
  • Date: Mon, 03 Jan 2005 14:00:56 -0700
To: address@hidden
From: "Greg Bensen" <address@hidden>
Subject: IDV - flight tracks
Organization: UNAVCO
Keywords: 200501031857.j03IvgL6006134


Hi Greg-


Institution: UNAVCO
Package Version: 1.2b1 and 1.1
Operating System: Windows XP
Hardware Information: dell P4 3.0 GHz 1.0 Gb ram
Inquiry: Hello,
I would like to create a netCDF file in the flight track format for following seismic waves through the earth (ray tracing). I think all I would need is a sample flight track file. Is this something you could send me/point me to? thanks. 

At this point, you'd need a file that is dimensioned on time with
lat/lon/alt at each point.  You can add more variables as needed.
It would look something like:

netcdf WMI_Lear-2003-05-28-212817 {
dimensions:
        time = UNLIMITED ; // (588 currently)
variables:
        double time(time) ;
                time:units = "seconds since 1970-1-1 0:00:00 0:00" ;
                time:long_name = "time" ;
                time:_FillValue = -99999. ;
                time:missing_value = -99999. ;
        float altitude(time) ;
                altitude:units = "km" ;
                altitude:long_name = "altitude MSL" ;
                altitude:_FillValue = -99999.f ;
                altitude:missing_value = -99999.f ;
        float latitude(time) ;
                latitude:units = "degrees_N" ;
                latitude:long_name = "latitude" ;
                latitude:_FillValue = -99999.f ;
                latitude:missing_value = -99999.f ;
                latitude:valid_range = -90.f, 90.f ;
        float longitude(time) ;
                longitude:units = "degrees_E" ;
                longitude:long_name = "longitude" ;
                longitude:_FillValue = -99999.f ;
                longitude:missing_value = -99999.f ;
                longitude:valid_range = -180.f, 180.f ;
        float pressure(time) ;
                pressure:units = "hPa" ;
                pressure:long_name = "pressure" ;
                pressure:field_type = "P" ;
                pressure:_FillValue = -99999.f ;
                pressure:missing_value = -99999.f ;
        float tdry(time) ;
                tdry:units = "deg_C" ;
                tdry:long_name = "temperature" ;
                tdry:field_type = "T" ;
                tdry:_FillValue = -99999.f ;
                tdry:missing_value = -99999.f ;
.....

We will eventually make changes to support multiple tracks in
one file (format yet TBD), but for now you need a separate
file for each track.

A sample file is attached.

Don Murray
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Attachment: WMI_Lear-2003-05-28-212817.nc
Description: Binary data