https://github.com/astrosica/astrolic

Line Integral Convolution (LIC) for astrophysics polarization.
https://github.com/astrosica/astrolic

astronomical-images astronomy astrophysics polarimetry polarization python python3

Last synced: 9 days ago
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Line Integral Convolution (LIC) for astrophysics polarization.

• Host: GitHub
• URL: https://github.com/astrosica/astrolic
• Owner: astrosica
• Created: 2020-08-17T16:44:46.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-09-15T15:59:39.000Z (over 4 years ago)
• Last Synced: 2024-11-15T09:29:42.726Z (2 months ago)
• Topics: astronomical-images, astronomy, astrophysics, polarimetry, polarization, python, python3
• Language: Jupyter Notebook
• Homepage:
• Size: 13.1 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# astroLIC

An implementation of [`LicPy`](https://rufat.be/licpy/) using astronomical polarimetry. An example is given in a Jupyter notebook which reproduces Figure 2 in Campbell et al. (2020).

## Dependencies

Required packages for `LicPy`:

* [pybind11](https://pypi.org/project/pybind11/)

* [tensorflow](https://www.tensorflow.org/)

* [matplotlib](https://matplotlib.org/3.1.1/index.html)

* [pytest](https://docs.pytest.org/en/stable/contents.html)

* [sympy](https://www.sympy.org/en/index.html)

Additional required packages for `astroLIC`:

* [numpy](https://numpy.org/)

* [aplpy](https://aplpy.github.io/index.html)

* [astropy](https://www.astropy.org/)

There is currently a bug with using the latest version of `tensorflow` that results in the error `AttributeError: module 'tensorflow' has no attribute 'placeholder'` when running `LicPy`. To work around this, you'll want to open the `lic.py` file; for me this is located in `/opt/anaconda3/lib/python3.7/site-packages/licpy-0.2-py3.7-macosx-10.9-x86_64.egg/licpy/`. When the error is raised, you should be able to read off the directory that is causing the error. Then, simply change `import tensorflow as tf` to the following:

`import tensorflow.compat.v1 as tf

tf.disable_v2_behavior()`.

## Installation

TBA.

## Usage

`astroLIC(I_dir,Q_dir,U_dir,length=0.25,toIAU=False,wcs=True)`

## Notes

This is a particular implementation of LIC meant for astronomical polarimetry which uses a specific coordinate system (IAU convention) not used in many other data sets. Therefore, `astro-LIC` is only meant to be used for astronomical polarization data and will not provide the correct orientation if used with other data sets.