Contents

• Introduction

• Dependencies

• Installation

• Tutorials

• API

• Citing

• Support

Introduction

SkySegmentor is a python 3 package for dividing points or maps (in HEALPix format) on the celestial sphere into equal-sized segments. It employs a sequential binary space partitioning scheme – a generalization of the k-d tree algorithm – that supports segmentation of arbitrarily shaped sky regions. By design, all partitions are approximately equal in area, with discrepancies no larger than the HEALPix pixel scale.

Dependencies

• numpy – versions: >=1.22,<1.27

• healpy – versions: >=1.15.0

Installation

Pip Installation

pip install skysegmentor

From the source

Clone the repository

git clone https://github.com/knaidoo29/SkySegmentor.git
cd SkySegmentor

and install by running

pip install . [--user]

Tutorials

• Tutorials
  • Basic Usage
  • Advanced Usage
  • Analysis and Error Estimation

API

• API
  • coords
  • groupfinder
  • maths
  • partition
  • rotate
  • utils

Citing

Warning

These are placeholders to be replaced upon publication on ArXiv.

If you use SkySegmentor in a publication please cite:

• NASA ADS:

• ArXiv:

BibTex:

@ARTICLE{Naidoo2025,
    author = {{Euclid Collaboration} and {Naidoo}, K. and {Ruiz-Zapatero}, J.
    and {Tessore}, N. and {Joachimi}, B. and {Loureiro}, A. and others ...},
    title = "{Euclid preparation: TBD. Accurate and precise data-driven angular power spectrum covariances}"
 }

and include a link to the SkySegmentor documentation page: https://skysegmentor.readthedocs.io/

Support

If you have any issues with the code or want to suggest ways to improve it please open a new issue (here) or (if you don’t have a github account) email krishna.naidoo.11@ucl.ac.uk.