healpy
34 posts — page 2
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Plot HEALPix pixel boundaries
Some time ago I created a Jupyter Notebook based on plotly to create a 3D visualization of the boundaries of HEALPix pixels on the sphere.
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healpy 1.15.0 released
Just released healpy 1.15.0, this is a large release with many important changes, please test and open issues at New viz function projview based on plain matplotlib, with lon/lat labels and more
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Investigate rotation of masks in healpy
Investigating a question about healpy on Stackoverflow python import healpy as hp import numpy as np %matplotlib inline
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Correct a power spectrum by the instrument beam with healpy
If you are analyzing a map from an instrument with a specific beam width, you can correct the power spectrum by the smoothing factor caused by that beam and obtain a better approximation of the power spectrum of the orignal sky.
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Compute the Planck CMB temperature power spectrum with healpy anafast
import healpy as hp import numpy as np import os import astropy.units as u import matplotlib.pyplot as plt %matplotlib inline
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Install HEALPix and PolSpice in a conda environment
Some notes on how to install HEALPix and PolSpice inside a conda environment, with some details about doing it at NERSC, but most of the tutorial is independent of that.
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Example of the `healpy` query disc function
Example of the `healpy` query disc function
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Read and process Planck CMB power spectra with `healpy`
In this tutorial we will load CMB power spectra generated by the cosmological parameters measured by Planck, we will create a realization of the Spherical Harmonics coefficients $a{\ell m}$, save it to disk, and use them to create maps at different resolutions.
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Unit conversion with broadband detectors looking at the CMB
import healpy as hp import numpy as np import matplotlib.pyplot as plt from pysm3 import units as u import pysm3 as pysm %matplotlib inline
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Handle white noise with healpy 3 not-uniform and partial sky coverage
Simulate white noise maps and use hitmaps
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Handle white noise with healpy 2 partial sky coverage
Simulate white noise maps and use hitmaps
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Handle white noise with healpy 1 Full sky coverage
Simulate white noise maps and use hitmaps
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White noise NET in radio-astronomy and cosmology
Create a white noise map and compare with power spectrum expected from the NET
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Planck CMB map at high resolution
Prompted by a colleague, I created a high-resolution version of the Cosmic Microwave Background map in MollWeide projection released by the Planck collaboration, available on the Planck Data Release Website in FITS format.
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Interactive figures in the browser - CMB power spectra
For a long time I've been curious about trying out d3.js , the javascript plotting library which is becoming the standard for interactive plotting in the browser.