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On 19/10/11 08:42, Martin Raspaud wrote:
> On 27/07/11 00:06, John Caron wrote:
>
>> Im thinking the way forward for now might be to follow Chris' idea of
>> specific examples. Then we can see what the real issues are.
>
>> So Id invite anyone to submit examples, and we can work out the CDL.
>
> Hi all,
>
> Finally catching up, here is an example of meteosat 9/seviri data. Hope
> that helps !
Maybe I ought to clarify a bit:
- - This data hold both visible and IR channels, ie reflective and emissive
- - One of the channels is higher resolution
- - no specific polarization
- - the variable names are automatically generated from the resolution and
the type of channel (reflective or emissive)
- - the standard_name we use now for bands is "band_data". Did we agree on
something different ?
- - we are using cells for describing the bandwidth
Best regards,
Martin
> $ ncdump -h seviri.nc
> netcdf seviri {
> dimensions:
> y1000mreflective = 3600 ;
> x1000mreflective = 9000 ;
> band1000mreflective = 1 ;
> y3000memissive = 1200 ;
> x3000memissive = 3000 ;
> band3000memissive = 8 ;
> y3000mreflective = 1200 ;
> x3000mreflective = 3000 ;
> band3000mreflective = 3 ;
> nv = 2 ;
> variables:
> short band_data1000mreflective(y1000mreflective, x1000mreflective,
> band1000mreflective) ;
> band_data1000mreflective:grid_mapping = "seviri_area_3600x9000"
> ;
> band_data1000mreflective:valid_range = -32767L, 32767L ;
> band_data1000mreflective:standard_name = "band_data" ;
> band_data1000mreflective:resolution = 1000.134348869 ;
> short band_data3000memissive(y3000memissive, x3000memissive,
> band3000memissive) ;
> band_data3000memissive:grid_mapping = "seviri_area_1200x3000" ;
> band_data3000memissive:valid_range = -32767L, 32767L ;
> band_data3000memissive:standard_name = "band_data" ;
> band_data3000memissive:resolution = 3000.403165817 ;
> short band_data3000mreflective(y3000mreflective, x3000mreflective,
> band3000mreflective) ;
> band_data3000mreflective:grid_mapping = "seviri_area_1200x3000"
> ;
> band_data3000mreflective:valid_range = -32766L, 32766L ;
> band_data3000mreflective:standard_name = "band_data" ;
> band_data3000mreflective:resolution = 3000.403165817 ;
> string bandname1000mreflective(band1000mreflective) ;
> bandname1000mreflective:standard_name = "band_name" ;
> string bandname3000memissive(band3000memissive) ;
> bandname3000memissive:standard_name = "band_name" ;
> string bandname3000mreflective(band3000mreflective) ;
> bandname3000mreflective:standard_name = "band_name" ;
> double nominal_wavelength1000mreflective(band1000mreflective) ;
> nominal_wavelength1000mreflective:bounds =
> "wl_bnds1000mreflective" ;
> nominal_wavelength1000mreflective:standard_name =
> "radiation_wavelength" ;
> nominal_wavelength1000mreflective:units = "um" ;
> double nominal_wavelength3000memissive(band3000memissive) ;
> nominal_wavelength3000memissive:bounds = "wl_bnds3000memissive"
> ;
> nominal_wavelength3000memissive:standard_name =
> "radiation_wavelength" ;
> nominal_wavelength3000memissive:units = "um" ;
> double nominal_wavelength3000mreflective(band3000mreflective) ;
> nominal_wavelength3000mreflective:bounds =
> "wl_bnds3000mreflective" ;
> nominal_wavelength3000mreflective:standard_name =
> "radiation_wavelength" ;
> nominal_wavelength3000mreflective:units = "um" ;
> double offset1000mreflective(band1000mreflective) ;
> offset1000mreflective:standard_name =
> "linear_calibration_offset" ;
> double offset3000memissive(band3000memissive) ;
> offset3000memissive:standard_name = "linear_calibration_offset"
> ;
> double offset3000mreflective(band3000mreflective) ;
> offset3000mreflective:standard_name =
> "linear_calibration_offset" ;
> double scale1000mreflective(band1000mreflective) ;
> scale1000mreflective:standard_name =
> "linear_calibration_scale_factor" ;
> double scale3000memissive(band3000memissive) ;
> scale3000memissive:standard_name =
> "linear_calibration_scale_factor" ;
> double scale3000mreflective(band3000mreflective) ;
> scale3000mreflective:standard_name =
> "linear_calibration_scale_factor" ;
> int64 seviri_area_1200x3000 ;
> seviri_area_1200x3000:grid_mapping_name =
> "vertical_perspective" ;
> seviri_area_1200x3000:latitude_of_projection_origin = 0. ;
> seviri_area_1200x3000:perspective_point_height = 35785831. ;
> seviri_area_1200x3000:semi_major_axis = 6378169. ;
> seviri_area_1200x3000:longitude_of_projection_origin = 0. ;
> seviri_area_1200x3000:semi_minor_axis = 6356583.8 ;
> int64 seviri_area_3600x9000 ;
> seviri_area_3600x9000:grid_mapping_name =
> "vertical_perspective" ;
> seviri_area_3600x9000:latitude_of_projection_origin = 0. ;
> seviri_area_3600x9000:perspective_point_height = 35785831. ;
> seviri_area_3600x9000:semi_major_axis = 6378169. ;
> seviri_area_3600x9000:longitude_of_projection_origin = 0. ;
> seviri_area_3600x9000:semi_minor_axis = 6356583.8 ;
> double time ;
> time:long_name = "Nominal time of the image" ;
> time:standard_name = "time" ;
> time:units = "seconds since 1970-01-01 00:00:00" ;
> string units1000mreflective(band1000mreflective) ;
> units1000mreflective:standard_name = "band_units" ;
> string units3000memissive(band3000memissive) ;
> units3000memissive:standard_name = "band_units" ;
> string units3000mreflective(band3000mreflective) ;
> units3000mreflective:standard_name = "band_units" ;
> double wl_bnds1000mreflective(band1000mreflective, nv) ;
> double wl_bnds3000memissive(band3000memissive, nv) ;
> double wl_bnds3000mreflective(band3000mreflective, nv) ;
> double x1000mreflective(x1000mreflective) ;
> x1000mreflective:long_name = "x coordinate of projection" ;
> x1000mreflective:standard_name = "projection_x_coordinate" ;
> x1000mreflective:units = "m" ;
> double x3000memissive(x3000memissive) ;
> x3000memissive:long_name = "x coordinate of projection" ;
> x3000memissive:standard_name = "projection_x_coordinate" ;
> x3000memissive:units = "m" ;
> double x3000mreflective(x3000mreflective) ;
> x3000mreflective:long_name = "x coordinate of projection" ;
> x3000mreflective:standard_name = "projection_x_coordinate" ;
> x3000mreflective:units = "m" ;
> double y1000mreflective(y1000mreflective) ;
> y1000mreflective:long_name = "y coordinate of projection" ;
> y1000mreflective:standard_name = "projection_y_coordinate" ;
> y1000mreflective:units = "m" ;
> double y3000memissive(y3000memissive) ;
> y3000memissive:long_name = "y coordinate of projection" ;
> y3000memissive:standard_name = "projection_y_coordinate" ;
> y3000memissive:units = "m" ;
> double y3000mreflective(y3000mreflective) ;
> y3000mreflective:long_name = "y coordinate of projection" ;
> y3000mreflective:standard_name = "projection_y_coordinate" ;
> y3000mreflective:units = "m" ;
>
> // global attributes:
> :satellite_name = "meteosat" ;
> :service = "" ;
> :title = "Meteosat09 satellite, Seviri instrument." ;
> :satellite_number = 9L ;
> :comments = "No comment." ;
> :Conventions = "CF-1.4" ;
> :references = "Pytroll - http://pytroll.org"; ;
> :instrument_name = "seviri" ;
> :institution = "Original data disseminated by EumetCast." ;
> :history = "2011-10-19T06:36:44.663765 - HRIT/LRIT data read by
> pytroll/mipp.\n2011-10-19T06:36:57.270975 - Saved as netcdf4/cf by
> pytroll/mpop." ;
> }
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