pyorbital

by pytroll Python Version: Current License: GPL-3.0

X-Ray Key Features Code Snippets(3)Community Discussions(4)Vulnerabilities Install Support

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Orbital and astronomy computations in python

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pyorbital Key Features

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pyorbital Examples and Code Snippets

Determine if we should skip summary .

python

Lines of Code : 22

License : Non-SPDX (Apache License 2.0)

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def skip_summary():
  """Determines if summary should be skipped.

  If using multiple replicas in distributed strategy, skip summaries on all
  replicas except the first one (replica_id=0).

  Returns:
    True if the summary is skipped; False other

Step to skip policy .

java

Lines of Code : 13

License : Permissive (MIT License)

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@Bean
    public Step skipPolicyStep(@Qualifier("skippingItemProcessor") ItemProcessor processor,
                               ItemWriter writer) throws ParseException {
        return stepBuilderFactory
                .get("skipPolicyStep")

Return whether the layer should skip the first node .

python

Lines of Code : 12

License : Non-SPDX (Apache License 2.0)

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def _should_skip_first_node(layer):
  """Returns True if the first layer node should not be saved or loaded."""
  # Networks that are constructed with an Input layer/shape start with a
  # pre-existing node linking their input to output. This node is

Community Discussions

Trending Discussions on pyorbital

Cleanest way to support xarray, dask, and numpy arrays in one function

How to make a python script reboot itself

Calculating zenith and elevation angles for satellite as seen from the ground

Wrong longitude calculation in pyorbital

QUESTION

Cleanest way to support xarray, dask, and numpy arrays in one function

Asked 2020-Apr-04 at 02:35

I have a function that accepts multiple 2D arrays and creates two new arrays with the same shape. It was originally written to only support numpy arrays, but was "hacked" to support dask arrays if a "chunks" attribute was seen. A user who was using xarray DataArrays pointed out that this function now returns dask arrays because DataArray's have a "chunks" attribute.

I'm wondering if the dask/xarray experts can tell me what the cleanest way to support all 3 (4?) object types might be without having to duplicate code for each type (numpy array, dask array, xarray with numpy, xarray with dask). Keep in mind the inputs are 2D arrays so the masking operations involved aren't supported out of the box. The related pull request for fixing this is here. Here is what we have so far while trying to avoid adding xarray and dask as required dependencies:

...

ANSWER

Answered 2018-Aug-10 at 23:10

OK. You may want to avoid unnecessary dependence. I often define has_dask variable

Source https://stackoverflow.com/questions/51774470

QUESTION

How to make a python script reboot itself

Asked 2018-Nov-21 at 15:57

I work actually on my raspberry 3 without internet for my internship.

Firstly I created a python script that I schedule with Cron to update my raspberry's hour every 12h.

Secondly, I have another script should run continually. But I observed that, when I update the time, my script that run continually, doesn't update its datetime.

So I would like to reboot it, to allow the script to take the time in consideration. here my script I would like to reboot.

...

ANSWER

Answered 2018-Nov-21 at 15:57

You could use os.execl() to restart the program.

Source: https://docs.python.org/3/library/os.html#os.execl

Source https://stackoverflow.com/questions/53415882

QUESTION

Calculating zenith and elevation angles for satellite as seen from the ground

Asked 2018-Aug-02 at 16:57

I have the latitude, longitude, and height for a satellite and for a ground observer. I am trying to calculate the satellite zenith angle and satellite azimuth angle, for the satellite, as seen from the ground.

I'm currently trying to solve this using astropy. The documentation describes how to calculate the zenith and azimuth angle for the Sun.

I tried to place the satellite straight above the observer, so that the zenith angle should be 0° (or the elevation angle 90°).

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ANSWER

Answered 2018-Aug-02 at 16:57

You can get this from pyorbital. The relevant function is get_observer_look. For some reason, it wants the time, and it apparently requires all inputs are ndarray objects. It warns when the azimuth is ill-defined (such as when the zenith angle is zero). But it does work:

Source https://stackoverflow.com/questions/51656659

QUESTION

Wrong longitude calculation in pyorbital

Asked 2018-Apr-14 at 22:09

While playing a bit with pyorbital I noticed that the function get_lonlatalt() does not seem to return a correct longitude value to me. So I have compared the returned Lon/Lat/Alt to other tracking software:

The returned Altitude and Latitude are spot on but the Longitude seems to be off (using the below code example the function returns about 15deg less than what the real position of the ISS is right now).

The below code prints the Lat/Lon/Alt of the ISS once per second to the console and can be used to compare the position to e.g. http://www.n2yo.com/?s=25544

Does anyone have any suggestions how to fix this/why this is happening ?

P.S. Unfortunately stackoverflow doesnt allow me to create the Tag "pyorbital" before 1500 reputation..

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ANSWER

Answered 2018-Apr-14 at 22:09

I just tried it, and it seems to work perfectly. Are you sure you're looking at the satellite location on the website you provided, and not your own location? I made the same mistake at first.

EDIT:

so I dove into the source code a bit to try to find why only lon is showing this behavior.

In orbital.py, the function astronomy.gmst() is used ONLY to calculate the lon. In astronomy.py, gmst() calls jdays2000() where we see this line of code: np.datetime64('2000-01-01T12:00'). Checking the docs of numpy.datetime (https://docs.scipy.org/doc/numpy-1.14.0/reference/arrays.datetime.html), we see that the way this function works (timezone wise) was changed numpy 1.11 (2016), and pyorbital also took this change into account some time later (https://github.com/pytroll/pyorbital/commit/08bb5be87c65412af5d7293c00fa2680b068d150).

So my guess is going to be either your pyorbital package is not up to date, or your numpy is not up to date.

My versions (numpy==1.14.2, pyorbital==1.3.1)

Source https://stackoverflow.com/questions/49836084

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