healpy
34 posts — page 3
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Planck CTP angular power spectrum ell binning
Planck released a binning of the angular power spectrum in the Explanatory supplement, unfortunately the file is in PDF format, non easily machine-readable: http://www.sciops.esa.int/wikiSI/planckpla/index.php?title=Frequencymapsangularpowerspectra&instance=PlanckPublicPLA So here is a csv version: https://gist.github.com/zonca/6288439 Follows embedded gist.
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HEALPix map of the Earth using healpy
HEALPix maps can also be used to create equal-area pixelized maps of the Earth, RGB colors are not supported in healpy, so we need to convert the image to colorscale. The best user case is for using spherical harmonic transforms, e.g. apply a smoothing filter, in this case HEALPix/healpy tools are really efficient.
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Noise in spectra and map domain
Spectra NET or $\sigma$ is the standard deviation of the noise, measured in mK/sqrt(Hz), typical values for microwave amplifiers are 0.2-5. This is the natural unit of the amplitude spectra (ASD), therefore the high frequency tail of the ASD should get to the expected value of the NET.
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Ubuntu PPA for HEALPix and healpy
HEALPix C, C++ version 3.00 and healpy version 1.4.1 are now available in a PPA repository for Ubuntu 12.04 Precise and Ubuntu 12.10 Quantal.