Ryan May
Staff
- Wednesday 4th September 2024 3:54 PM
Greetings!
My apologies for the confusion. MetPy's "Combined Plotting" example is plotting contours of temperature (at the 850 hPa pressure level) on top of the Geopotential Height (again of the 850 hPa fixed pressure level). The native format of NARR gridded data is GRIB and can be found here:
https://www.ncei.noaa.gov/thredds/catalog/model/narr.html
Using this THREDDS server, in addition to downloading the raw files (using HTTPServer), you can also get a link for accessing using the OPENDAP protocol (can be given directly to `xarray.open_dataset()`) or download a subset in netCDF format using the NetCDF Subset Service.
I'm surprised MetPy's `narr_example.nc` doesn't load with QGis, or especially Panoply, since this is a CF-compatible netCDF file.
Hope this helps,
Ryan Hi Ryan,
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Max Bleiweiss
User
- Wednesday 4th September 2024 5:11 AM
Hi Ryan, My new question did not involve the old issues with the surface wx map -- it was entirely different and involved the sample program which seems to use a NARR pressure file; but doesn't...it shows an overlay of a pressure field on a temperature field... Sorry to be so much trouble... Regards, Max Max P. Bleiweiss, M.S., F.R.A.S. Agricultural Research Scientist (ret.) New Mexico State University mobile: +1 575.640.2275 Department of Entomology, e-mail: address@hidden Plant Pathology and Weed Science e-mail: address@hidden *** "We enjoy thoroughly only the pleasure that we give." Alexandre Dumas *** ________________________________________
From: NSF Unidata MetPy, Siphon (Python) <address@hidden> Sent: Tuesday, September 3, 2024 8:51 PM To: Max Bleiweiss Subject: RE: (#MQD-9803417) question regarding "Combined Plotting" example... WARNING This email originated external to the NMSU email system. Do not click on links or open attachments unless you are sure the content is safe. |
Ryan May
Staff
- Tuesday 3rd September 2024 2:50 PM
Greetings!
The challenge here is that NARR, or North American Regional Reanalysis, is generally composed of fields of things like temperature and humidity on a regular grid. I'm guessing the products you linked to are some kind of automatically generated frontal locations on the basis of these gridded fields. Either way, the frontal locations as encoded in the netCDF file seems like something that a lot of software isn't necessarily geared to handle, so it's going to require some manual effort on your end to get these to work--I've never worked with these.
Cheers,
Ryan
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Max Bleiweiss
User
- Saturday 31st August 2024 1:47 PM
Greetings, I did try stackoverflow and found it very confusing and difficult to invoke -- perhaps, it is just my old age...so, thank you for being there... Anyway, the sample netcdf file provided for use in subject sample program in not readable by either Panoply or QGIS -- I was trying those tools so that I could learn more about how to use a "real" NARR file -- could you please recommend a real NARR file that might work in that example? Regards, Max Max P. Bleiweiss, M.S., F.R.A.S. Agricultural Research Scientist (ret.) New Mexico State University mobile: +1 575.640.2275 Department of Entomology, e-mail: address@hidden Plant Pathology and Weed Science e-mail: address@hidden *** "We enjoy thoroughly only the pleasure that we give." Alexandre Dumas ***e |