siphon | Python utilities

by Unidata Python Version: Current License: BSD-3-Clause

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Siphon - A collection of Python utilities for retrieving atmospheric and oceanic data from remote sources, focusing on being able to retrieve data from Unidata data technologies, such as the THREDDS data server.

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Community Discussions

Trending Discussions on siphon

GOES-East Full Disk domain realtime imagery does not fit actual data

How to embed MetPy SkewT plot in PyQt5

mysql how to allow user to update a column in a DB once with php

How to return multiple lines with geopandas given a DataFrame with two lat/long values

How to properly calculate temperature advection with metpy, error with units

Sea Surface Temperature NetCDF4 Input z must be 2D, not 3D

Error using .assign_latitude_longitude: AttributeError: crs attribute is not available

Passing from a "lambda" function

convert metpy units GFS precipitation_rate

850hPa temp Advection Example Not Working

QUESTION

GOES-East Full Disk domain realtime imagery does not fit actual data

Asked 2021-Aug-20 at 19:46

I'm trying to plot GOES-East full disk data using metpy, and Siphon to download the latest data from the THREDDS data server. However, after comparing my plots with the realtime imagery, ther seems to be a large difference.

Below is my code:

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ANSWER

Answered 2021-Aug-20 at 19:45

What you're seeing is that your image is flipped (it's easier to identify if you look at the global plot of that data). What's happening is the origin you specified ('upper'/'lower') disagree with what you passed as extent. So either tweak your origin parameter:

Source https://stackoverflow.com/questions/68863073

QUESTION

How to embed MetPy SkewT plot in PyQt5

Asked 2021-Aug-11 at 18:03

I want to embed a MetPy SkewT diagram in a PyQT5 GUI. The following code creates a SkewT diagram:

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ANSWER

Answered 2021-Aug-10 at 18:51

I suggest you to create a separate python file ui.py where you set up your PyQt5 window, with widgets, layout etc. I use Qt Designer for this purpose.
You should organize your working directory as:

Source https://stackoverflow.com/questions/68727405

QUESTION

mysql how to allow user to update a column in a DB once with php

Asked 2021-Aug-08 at 15:04

So I have two different tables, a users table and an articles table. The idea is to allow a user to rate an article, but only allow them to rate it once (possible change their existing rating too but I can come to that conclusion later).

As of now I just have the update value working to allow them to rate the article, but of course a user can rate an article as many times as they want.

To give you an idea of how I have everything working, when a user logins in, a session is created with their user information. So when they go to rate an article, I have the ability to check the user, I just don't know how to stop them from rating if they have already rated a specific article.

The user table consists of among other things their username and their unique ID

and the article table consists among other things the article contents, the article unique ID, and the articles rating.

I had some really sloppy ideas like when the user rates an article their ID gets stored into the articles row in some kind of "users who have rated" column, and then I can do a for loop or something to siphon out all the user IDs and then check if their ID exists in that articles entry but then each article would have a row with possibly hundreds or thousands of userIDs on it and there seems like there would be a more elegant way.

Any help or direction is appreciated :)

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ANSWER

Answered 2021-Aug-08 at 15:04

Create a UserRatings table which has foreign keys to the users table and the articles table, and stores a row linking the user to the article, and the rating they gave it and when it occurred.

Then if a user tried to rate it again you just check this table for the user ID/article ID combination before allowing it.

And then if you wanted got can do things like show the user a list of articles they have previously rated, etc

Source https://stackoverflow.com/questions/68701948

QUESTION

How to return multiple lines with geopandas given a DataFrame with two lat/long values

Asked 2021-Jun-14 at 19:17

I built a python program that will siphon through my email and retrieve lat/long pairs of worksites that will be relevant for future analysis. At the moment I have the following dataframe returned.

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ANSWER

Answered 2021-Jun-14 at 15:40

There is no pre-built way for your exact transformation, so you have to create your geometry objects yourself. I assume you meant one LineString object per row in in your DataFrame. With little typing, you could create such a column using the powerful apply method.

Source https://stackoverflow.com/questions/67972833

QUESTION

How to properly calculate temperature advection with metpy, error with units

Asked 2021-Apr-19 at 18:28

I'm kinda new with Metpy. I've been trying to calculate the temperature advection with Metpy but it's been unsuccessful. Since I'm new with this package, I don't understand why needs to have units to work properly. When I calculate temperature advection I end with some weird lines on my maps and I don't know why. I think it's because of the units or something but I'm not sure. I attach my script below:

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ANSWER

Answered 2021-Apr-19 at 18:28

advection is definitely one of the trickier functions to use in MetPy. Since you're using netcdf4-python to open the files, you definitely want to multiply with the units on the left, like:

Source https://stackoverflow.com/questions/67166316

QUESTION

Sea Surface Temperature NetCDF4 Input z must be 2D, not 3D

Asked 2021-Apr-17 at 17:14

I am trying to plot recent sea surface temperature data on a map. I got it working when I downloaded the netCDF4 file, but when I try to access the file from https://www.ncei.noaa.gov/thredds/, I get a TypeError saying, "Input z must be 2D, not 3D". The downloaded file I used originally was from: https://psl.noaa.gov/ Here's what I have:

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ANSWER

Answered 2021-Apr-17 at 17:14

I did not consider zlev when pulling the data out of the dataset. Changing

Source https://stackoverflow.com/questions/67139682

QUESTION

Error using .assign_latitude_longitude: AttributeError: crs attribute is not available

Asked 2021-Mar-11 at 19:57

I am working with the NDFD forecast datasets and would like to assign lat and long within the array to give me the ability to plot the data outside of matplotlib. My versions are:

python 3.8,metpy 1.0.0,cartopy 0.18.0, xarray 0.16.2, siphon 0.8.0

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ANSWER

Answered 2021-Mar-11 at 19:57

assign_latitude_longitude requires that information about the CRS is available, so that it can properly calculation longitude and latitude from your projected coordinates. This means that you first need to have called parse_cf() in some way. In your code above, you save the results of calling parse_cf('Total_precipitation_surface_6_Hour_Accumulation') to var, but this does not modify the original Dataset stored in ds.

Instead you need to either call it on the variable that has had the information parsed as:

Source https://stackoverflow.com/questions/66586095

QUESTION

Passing from a "lambda" function

Asked 2021-Jan-25 at 20:28

In Python I'm using a class out of library. I only want to call certain functions if a certain parameter is set.

For example:

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ANSWER

Answered 2021-Jan-25 at 20:28

Something like this may work:

Source https://stackoverflow.com/questions/65891460

QUESTION

convert metpy units GFS precipitation_rate

Asked 2020-Oct-19 at 17:20

I followed the example here (https://unidata.github.io/python-gallery/examples/Precipitation_Map.html) but when trying to access the units I get a dimensionality error. I'm assuming this is to do with pint and the way it parses units and the fact precipitation is a rate. Any help would be appreciated

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ANSWER

Answered 2020-Oct-19 at 17:20

This is caused by the fact that the units string for that variable is kg.m-2.s-1, which is a UDUnits-compatible string, but does not work with the default unit parser in Pint, which is what MetPy uses for unit support.

This is fixed in MetPy 1.0. You can install the second release candidate for MetPy 1.0 with conda:

Source https://stackoverflow.com/questions/64430383

QUESTION

850hPa temp Advection Example Not Working

Asked 2020-Jul-13 at 16:19

I am new to plotting and examining wx data using python. I started with this example 850 hPa temp advection and its failing at this statement.

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ANSWER

Answered 2020-Jul-13 at 16:19

This is happening because that URL is out-of-date. NCEI has updated their TDS URLs for model output from https://www.ncei.noaa.gov/thredds/ncss/grid// to .../thredds/ncss/model-/ and in the case of historical datasets, .../model--old/. So in this case, your correct base_url would be https://www.ncei.noaa.gov/thredds/ncss/model-gfs-g4-anl-files-old/

Important follow-up note, that python-gallery example collection has been retired and so is out of date. The more up-to-date gallery is available at the Unidata Python Training website, though the NCEI TDS URLs throughout that site are currently out-of-date as well. Hopefully for not much longer!

Source https://stackoverflow.com/questions/62868143

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