---
name: "HPXcvt"
section: "1"
platform: "linux"
package: "wcslib"
version: "8.10-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/HPXcvt"
---

# HPXcvt(1)

Reorganise HEALPix data into a 2-D FITS image

## NAME

HPXcvt - Reorganise HEALPix data into a 2-D FITS image

## SYNOPSIS

**HPXcvt** \[*-C\<col\>*\] \[*-c\<sys\>*\] \[*-n\|-r*\] \[*-q\<quad\>*\] \[*-x\<n\|s\>*\]

## DESCRIPTION

-

  \[\<infile\> \[\<outfile\>\]\]

HPXcvt reorganises HEALPix data into a 2-D FITS image with HPX coordinate system.  The input data may be stored in a FITS file as a primary image or image extension, or as a binary table extension.  Both NESTED and RING pixel indices are supported.  The input and output files may be omitted or specified as "-" to indicate stdin and stdout respectively.

## OPTIONS

- **-C**\<col\>

  Binary table column number from which to read data, default 1 (n.b. WMAP exclusion masks are in column 2).

- **-c**\<sys\>

  Specify the coordinate system to be used to label the output map if the COORDSYS keyword is absent from the input FITS header.  Recognised values are g (galactic), e (ecliptic) or q (equatorial).

- **-n**\|-r

  Assume n(ested) or r(ing) organization if the ORDERING keyword is absent from the input FITS header.

- **-q**\<quad\>

  Recentre longitude at quad(mod 4) x 90 degrees, where quad(rant) is an integer.

- **-x**\<n\|s\>

  Use a north-polar or south-polar layout (XPH).