healpix | An implementation of HEALPix in JavaScript / TypeScript | Runtime Evironment library

by michitaro TypeScript Version: Current License: MIT

X-Ray Key Features Code Snippets Community Discussions(5)Vulnerabilities Install Support

kandi X-RAY | healpix Summary

healpix is a TypeScript library typically used in Server, Runtime Evironment, Nodejs applications. healpix has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

This module is an implementation of HEALPix in TypeScript. A Javascript version is available as well. (Typescript is a typed superset of Javascript, that compiles to Javascript.). This package was implemented based on the description in the HEALPix paper. Pixelisation-related functions (including corners) and disk query are available for the ring and nested HEALPix pixelisation schemes. Most API interfaces are ported from wonderful healpy Python package, and tests against healpy are used to show correctness. The following sections explain installation and usage, and give examples. Detailed API documentation is also available.

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Quality

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Support

healpix has a low active ecosystem.

It has 8 star(s) with 4 fork(s). There are 1 watchers for this library.

It had no major release in the last 6 months.

There are 3 open issues and 6 have been closed. On average issues are closed in 2 days. There are 1 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of healpix is current.

Quality

healpix has 0 bugs and 0 code smells.

Security

healpix has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

healpix code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

healpix is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

healpix releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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healpix Key Features

No Key Features are available at this moment for healpix.

healpix Examples and Code Snippets

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Community Discussions

Trending Discussions on healpix

Different values of a_lm coefficients for different values of Nside in HealPix

*** stack smashing detected ***: terminated Aborted (core dumped) using HEALPix C subroutines

segmentation fault while reading a FITS file with healpix

Plotting astronomical scatter plot - mean vs longitude (galactic)

HEALPix with texture UV mapping

QUESTION

Different values of a_lm coefficients for different values of Nside in HealPix

Asked 2022-Mar-25 at 08:58

I am using HealPix to calculate the outflow rate of particles through a sphere with some radius and I am trying to determine coefficients of spherical harmonics (basically fit some data with spherical harmonics).

The basic steps are:

...

ANSWER

Answered 2022-Mar-25 at 08:58

In order to get the same values of a_lm coefficients it is necessary to normalize values of individual pixels with the pixel surface - dividing with 4*pi/npix.

Another thing, in case it might be helpful to someone. The outflow rate can be easily computed from

Source https://stackoverflow.com/questions/71538092

QUESTION

*** stack smashing detected ***: terminated Aborted (core dumped) using HEALPix C subroutines

Asked 2021-Jun-09 at 13:35

I am trying to translate a python code into a C code. So I was trying to translate that line:

...

ANSWER

Answered 2021-Jun-09 at 13:35

If you check the related documentation :

read_healpix_map

This routine reads a full sky HEALPix map from a FITS file

Location in HEALPix directory tree: src/C/subs/read_healpix_map.c

FORMAT float *read_healpix_map(char *infile, long *nside, char *coordsys, char *ordering)

ARGUMENTS

Source https://stackoverflow.com/questions/67903207

QUESTION

segmentation fault while reading a FITS file with healpix

Asked 2021-Jun-04 at 17:46

I'm trying to open a FITS file with healpix using a C code:

...

ANSWER

Answered 2021-Jun-04 at 17:46

Per the documentation of read_healpix_map():

ordering and coordsys are output arguments - they are pointers to space into which the function will write results. You have passed pointers to string constants in memory that will normally be marked read-only and may not be sufficiently large to receive the result in any case.

nside is also an output argument, initialising it to 512 serves no purpose. You do not need p_nside; you can simply pass &nside

It is not the most clear of interfaces; specifically it is not clear whether coordsys is a string or a single char. The documentation uses single quotes so you might assume char but then it does that for ordering too and that is clearly a string. It is safest to assume coordsys is a string - it will do no harm.

Source https://stackoverflow.com/questions/67841262

QUESTION

Plotting astronomical scatter plot - mean vs longitude (galactic)

Asked 2021-May-24 at 17:29

I want to create a scatter plot with the X-Axis as the longitude coordinates in the healpix file https://wwwmpa.mpa-garching.mpg.de/~ensslin/research/data/faraday2020.html (Healpix)

and the Y-Axis as the mean values in hdf5 file https://wwwmpa.mpa-garching.mpg.de/~ensslin/research/data/faraday2020.html (Faraday sky 2020)

Code until now:

...

ANSWER

Answered 2021-May-24 at 17:29

I think you're close. IMHO, this scatter plot is easier than plotting with both skyplot coordinates (projection="aitoff"). The process is similar to the answers I posted on your earlier question: Plot mean and standard dev values on skyplot using astropy from hdf5 file. You just need some minor teaks to the function parameters.

I modified your code to create a 2D scatter plot. Here's a quick summary of the differences:

Changed from astropy.coordinates import SkyCoord (instead of HEALPix)
Changed matplot type (removeprojection=)
Changes y-variable from b_rad to faraday_sky_mean on scatter plot.
Deleted c=faraday_sky_mean from plt.scatter() so data points are not color coded.

See code below.

Source https://stackoverflow.com/questions/67666918

QUESTION

HEALPix with texture UV mapping

Asked 2020-Oct-28 at 12:38

I found an implementation of the HEALpix algorithm this is the dokumentation And the output looks very nice.

The following images show the latitude / longitude conversion to HEALpix areas. The x-axe goes from 0 to 2 * pi. The y-axe goes from 0 to pi. The grey color represents the HEALpix pixel encoded in grey.

Nside = 1

Nside = 2

Nside = 4

Nside = 8

The different grey values are the IDs for the texture I have to use. That means, that each HEALpix pixel represents one texture. The missing part is the UV mapping within each of the HEALpix pixels like shown below:

nSide = 1 with UV mapping

Right now I am using the function:

...

ANSWER

Answered 2020-Oct-28 at 12:38

After a lot of research I came to a solution for this problem:

First of all, I've changed the scheme to NESTED. With the NESTED scheme and a very high nSide value (8192), the returned value from the

Source https://stackoverflow.com/questions/64483250

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