pygrib | Python interface for reading and writing GRIB data | Messaging library
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kandi X-RAY | pygrib Summary
Python interface for reading and writing GRIB data
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Trending Discussions on pygrib
QUESTION
I'm installing pygrib library for Python 3.10.2 on Windows 10 and I get an error:
...ANSWER
Answered 2022-Mar-20 at 18:32As mentionned on https://github.com/jswhit/pygrib/issues/115, I installed Pygrib with:
QUESTION
I am attempting to plot fields from a GRIB2 file of GFS model data (example file: https://nomads.ncep.noaa.gov/pub/data/nccf/com/gfs/prod/gfs.20220202/12/atmos/gfs.t12z.pgrb2.0p25.f006 ). Normally I would just use PyGRIB and I'd have this problem solved yesterday, but I am on Windows (because it's what my employer uses, so I'm stuck with it and have to make this work on a Windows environment) and Windows and PyGRIB don't play nice. I am able to open the GRIB2 file and even plot variables over the entire domain using GDAL. The only problem is I need a way to get an array of the latitude and longitude values at each grid point (similar to in PyGRIB doing .latlons() on a GRIB message) so I can plot a subset of the domain.
Basically, I'm trying to replicate what is being done in this video, and need the data (got it using dataset.GetRasterBand(269).ReadAsArray()), then the lat/lon information.
I also tried using xarray, but Windows doesn't play nice with xarray either.
...ANSWER
Answered 2022-Feb-03 at 00:40Given your comfort with PyGRIB, I'd say the solution is to use Conda and install it on Windows. You can use conda-forge's miniforge to install conda. Then, however you get Conda, install pygrib with:
QUESTION
I'm trying to access the data in a GRIB2 file at a specific longitude and latitude. I have been following along with this tutorial (https://www.youtube.com/watch?v=yLoudFv3hAY) approximately 2:52 but my GRIB file is formatted differently to the example and uses different variables
...ANSWER
Answered 2022-Jan-04 at 09:22You can access the closest datapoint to a specific latitude/longitude using:
QUESTION
I am using pygrib to open GFS data, I want the data to be in unstructured format (not the default option). in short, How can I set expand_reduce to False?
...ANSWER
Answered 2021-Nov-14 at 20:52The solution is to call expand_grid, this will modify the expand_reduced:
QUESTION
I'm trying to resample a set of GRIB2 arrays at 0.25 degree resolution to a coarser 0.5 degree resolution using the xESMF package (xarray's coarsen method does not work here because there is an odd number of coordinates in the latitude).
I have converted the GRIB data to xarray format through the pygrib package, which then subsets out the specific grid I need:
...ANSWER
Answered 2021-Feb-12 at 19:38I would recommend first trying conservative instead of bilinear (it's recommended on their documentation) and maybe check if you're using the parameters correctly because it seems something is wrong, my first guess would be that something you're doing moves the latitud around for some reason, I'm leaving the docs link here and hope someone knows more.
Regridder docs: https://xesmf.readthedocs.io/en/latest/user_api.html?highlight=regridder#xesmf.frontend.Regridder.__init__
Upscaling recommendation (search for upscaling, there's also a guide for increasing resolution): https://xesmf.readthedocs.io/en/latest/notebooks/Compare_algorithms.html?highlight=upscaling
QUESTION
When I try to plot data using Basemap from a Grib file, the map is not fitted to the data being plotted. I posted the code used below and and a link to the output image below that. I think the projection type might be the issue. I also tried making the projection cylindrical while keeping the rest of the code the same, but that didn't work either (though it looked a little better) and I posted a link to the output image for that as well. Maybe this helps to visualize what projection will properly fit the data? Any ideas as to what you think might have gone wrong would be appreciated.
...ANSWER
Answered 2020-Oct-14 at 07:02There are different ways to solve your problem:
- Setting xlim and ylim which is the easiest way for you:
QUESTION
I can't figure out how to add a color bar to my GRIB plot using the following code:
...ANSWER
Answered 2020-Jul-29 at 18:21When calling plt.colorbar(), the first argument is the matplotlib artist that the colorbar should correspond with--in this case you're colormapping contourf, so you should take the return value from this method and pass it, like this:
QUESTION
Hello StackOverflow Community,
I am a beginner Python programmer who is transitioning over from MATLAB. One of my biggest struggles so far has been trying to understand how to find out more information about new Python packages that I install. Let me attempt to give a concrete example below:
Say I download and want use the pygrib package to open and grab some atmospheric data from a .grib file I downloaded. I find some code online (here) that shows me how to grab data using pygrib. The author of that code uses syntax for the pygrib package that I just can't to find documented on the pygrib website (e.g. pygrib.open.select.values(); pygrib.open.select()["latitudeOfFirstGridPointInDegrees]).
When searching for more information on pygrib.open.select.values() on the pygrib website (here) I see that pygrib.open.select() takes **kwargs as its argument, and nothing further is explained.
My question here is, are kwargs and .values the same thing in Python? As in, is the .values a key word argument for pygrib.open.select()? My thoughts lead to the answer no, which then brings up another question:
Where can one find more information about the kwargs that pygrib.open.select()accepts, and in general how can one find this information for other Python packages? Would it be a matter of looking at the source code for each class?
Any help or guidance is sincerely appreciated. Thank you for your time and efforts.
...ANSWER
Answered 2020-Jan-31 at 18:36Keyword args syntax is well documented in general: geeksforgeeks.org/args-kwargs-python. This specific use of kwargs appears to be filtering based on certain keys in the data. Have you tried calling grb.keys() (where grb is a gribmessage value as returned by pygrib.open.select()) to find the things that can be used to as kwargs in the pygrib.open.select() method?
How does someone usually find methods like [
gribmessage.keys]?
- You need to know about Python and what types of thing everything is, e.g.
pygribis a module,pygrib.openis a class andpygrib.open.selectis is a method (all this is in the docs). - Now that you know
pygrib.open.selectis a method, check what it returns in the docs: agribmessage. - Look up
gribmessagein the docs and you will find thegribmessage.keysmethod.
How does someone usually find methods like this one? Say for instance, in my example If I wanted to find information about the
pygrib.open.select.values()method where would I look?
There is no special place I look to find this info; it's more about knowing how to use the docs. That being said, it doesn't look like the gribmessage.values method is well documented, the only relevant thing I can see is in the gribmessage.__getitem__ method (a special Python method that allows things like grb["some key"]) where values is mentioned.
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