Dear all,
We are compiling a new dataset containing cloud physical properties
(CPP). CPP is an algorithm to derive cloud, precipitation and radiation
products from MSG satellite images. We are working on this dataset and
we would like to make it 100% CF compliant (if possible). We will make
the dataset publicly available by using OGC WMS, OGC WCS and FTP services.
For ten of the sixteen CPP products we found matching standard_names in
the CF standard name table. However, for the other six products we were
not able to find proper standard names.
Therefore we came up with some initial standard_names fore these products:
- instrument_zenith_angle (degree): "Instrument zenith angle is the the
angle between the line of sight to the instrument and the local vertical" ;
- solar_instrument_relative_azimuth_angle (degree): "The difference
between the solar azimuth angle and the instrument azimuth angle" ;
- thermodynamic_particle_phase_at_cloud_top (status_flag): "The
thermodynamic phase of particles at the top of the cloud" ;
- thermodynamic_particle_phase_at_cloud_top_infrared (status_flag):
"The thermodynamic phase of particles at the top of the cloud, measured
using only infrared radiances" ;
- geometrical_thickness_of_liquid_water_cloud (m): "Cloud Geometrical
Thickness (cloud top height minus cloud base)" ;
- effective_radius_of_cloud_condensed_water_particle_at_cloud_top (m):
"Particle effective radius for both liquid and ice water particles" ;
What is your opinion on these names? We used an online CF-1.4 checker,
it returned six errors, corresponding with the six standard_names listed
above.
Is there a better way do distuingish between
thermodynamic_particle_phase_at_cloud_top and
thermodynamic_particle_phase_at_cloud_top_infrared?
Thanks in advance,
Maarten
PS: We made a preliminary dataset -- not yet CF compliant -- available
as a demo in a Web Map Service:
http://geoservices.knmi.nl/adaguc_portal/index.html?srs=EPSG:4326&bbox=-72.63451559819336,-67.11370050068278,73.49566191659957,71.92613704001961&service=http%3A%2F%2Fgeoservices.knmi.nl%2Fcgi-bin%2FMSGCPPTEST_R___FLCPP.cgi%253F&layer=cot$image/png$true$default$1$0&selected=0&dims=time$2010-08-29T12:00:00Z&baselayers=world_raster$nl_world_line
(If the link does not work you need to copy paste the URL manually in a
browser, some email programs only copy the first 256 characters)
PS2: These are the other ten products identified by their standard names:
- height_at_cloud_top: "The top of the highest cloud where height is
the vertical distance above the surface" ;
- cloud_area_fraction: "Cloud mask flag" ;
- atmosphere_optical_thickness_due_to_cloud: "Cloud Optical Thickness" ;
- air_temperature_at_cloud_top: "Cloud-Top Temperature" ;
- atmosphere_cloud_condensed_water_content: "Cloud Water Path" ;
-
number_concentration_of_cloud_liquid_water_particles_in_air_at_liquid_water_cloud_top:
Cloud Droplet Number Concentration" ;
- lwe_precipitation_rate: "Liquid water equivalent of precipitation" ;
- surface_downwelling_shortwave_flux: "Surface downwelling solar
radiation" ;
- solar_zenith_angle: "Sun zenith angle" ;
- surface_downwelling_shortwave_flux_assuming_clear_sky: "Surface
downwelling solar radiation assuming clear sky" ;
I can also provide a ncdump file if you are interested.
--
Maarten Plieger
KNMI, R&D Information and Observation Technology, De Bilt
(t) +31 30 2206330
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