Netcdf layer question

Q&A
1

Hi, all
I have a Netcdf file from ERA5 model. It contains 37 levels, and 24 hours each day, and parameters of temperature, geopotential , etc.
Can the GMT grdinfo show the info of the specific parameter at specific level and time?
According to help documents, I have tried:

$ gmt grdinfo "download.nc?z[1]"

But the output information dose not change.

Here is the data link: https://www.jianguoyun.com/p/DQ9wKWYQ2PCQBxjuid0D
And the data content:

Source:
           .\era5\data\download.nc
Format:
           64bit
Global Attributes:
           Conventions = 'CF-1.6'
           history     = '2021-01-25 12:29:12 GMT by grib_to_netcdf-2.16.0: /opt/ecmwf/eccodes/bin/grib_to_netcdf -S param -o /cache/data1/adaptor.mars.internal-1611577635.3646965-31867-15-c8a30075-33b0-4e6e-bd80-aa66400794d9.nc /cache/tmp/c8a30075-33b0-4e6e-bd80-aa66400794d9-adaptor.mars.internal-1611577635.3652627-31867-2-tmp.grib'
Dimensions:
           longitude = 5
           latitude  = 5
           level     = 37
           time      = 24
Variables:
    longitude
           Size:       5x1
           Dimensions: longitude
           Datatype:   single
           Attributes:
                       units     = 'degrees_east'
                       long_name = 'longitude'
    latitude 
           Size:       5x1
           Dimensions: latitude
           Datatype:   single
           Attributes:
                       units     = 'degrees_north'
                       long_name = 'latitude'
    level    
           Size:       37x1
           Dimensions: level
           Datatype:   int32
           Attributes:
                       units     = 'millibars'
                       long_name = 'pressure_level'
    time     
           Size:       24x1
           Dimensions: time
           Datatype:   int32
           Attributes:
                       units     = 'hours since 1900-01-01 00:00:00.0'
                       long_name = 'time'
                       calendar  = 'gregorian'
    z        
           Size:       5x5x37x24
           Dimensions: longitude,latitude,level,time
           Datatype:   int16
           Attributes:
                       scale_factor  = 7.0901
                       add_offset    = 233961.4879
                       _FillValue    = -32767
                       missing_value = -32767
                       units         = 'm**2 s**-2'
                       long_name     = 'Geopotential'
                       standard_name = 'geopotential'
    q        
           Size:       5x5x37x24
           Dimensions: longitude,latitude,level,time
           Datatype:   int16
           Attributes:
                       scale_factor  = 2.1534e-07
                       add_offset    = 0.007058
                       _FillValue    = -32767
                       missing_value = -32767
                       units         = 'kg kg**-1'
                       long_name     = 'Specific humidity'
                       standard_name = 'specific_humidity'
    t        
           Size:       5x5x37x24
           Dimensions: longitude,latitude,level,time
           Datatype:   int16
           Attributes:
                       scale_factor  = 0.001659
                       add_offset    = 245.7435
                       _FillValue    = -32767
                       missing_value = -32767
                       units         = 'K'
                       long_name     = 'Temperature'
                       standard_name = 'air_temperature'
2

It looks we need a permanent link to this

1 Like
3

Thanks for your reply.
But that is link for images. It dose not work for nc files.
Should I look this link?Modifiers for COARDS-compliant netCDF files.

4

It says Reading more complex multi-band IMAGES or GRIDS and the example provided is to read SST.