How To Install pymoctool on Ubuntu 22.04
Introduction
In this tutorial we learn how to install pymoctool on Ubuntu 22.04.
What is pymoctool
pymoctool is:
‘pymoctool’ is a command-line Python-based library for manipulating Multi-Order Coverage maps (MOCs).
Frequently astronomical survey catalogues or images are sparse and cover only a small part of the sky. In a Multi-Order Coverage map the extent of data in a particular dataset is cached as a pre-calculated mask image. The hierarchical nature enables fast boolean operations in image space, without needing to perform complex geometrical calculations. Services such as VizieR generally offer the MOC masks, allowing a faster experience in graphical applications such as Aladin, or for researchers quickly needing to locate which datasets may contain overlapping coverage.
The MOC mask image itself is tessellated and stored in NASA HealPix format, encoded inside a FITS image container. Using the HealPix (Hierarchical Equal Area isoLatitude Pixelization) tessellation method ensures that more precision (pixels) in the mask are available when describing complex shapes such as approximating survey or polygon edges, while only needing to store a single big cell/pixel when an coverage is either completely inside, or outside of the mask. Catalogues can be rendered on the mask as circles.
It is written in Python and uses the PyMOC library.
There are three methods to install pymoctool on Ubuntu 22.04. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.
Install pymoctool Using apt-get
Update apt database with apt-get using the following command.
sudo apt-get update
After updating apt database, We can install pymoctool using apt-get by running the following command:
sudo apt-get -y install pymoctool
Install pymoctool Using apt
Update apt database with apt using the following command.
sudo apt update
After updating apt database, We can install pymoctool using apt by running the following command:
sudo apt -y install pymoctool
Install pymoctool Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.
sudo aptitude update
After updating apt database, We can install pymoctool using aptitude by running the following command:
sudo aptitude -y install pymoctool
How To Uninstall pymoctool on Ubuntu 22.04
To uninstall only the pymoctool package we can use the following command:
sudo apt-get remove pymoctool
Uninstall pymoctool And Its Dependencies
To uninstall pymoctool and its dependencies that are no longer needed by Ubuntu 22.04, we can use the command below:
sudo apt-get -y autoremove pymoctool
Remove pymoctool Configurations and Data
To remove pymoctool configuration and data from Ubuntu 22.04 we can use the following command:
sudo apt-get -y purge pymoctool
Remove pymoctool configuration, data, and all of its dependencies
We can use the following command to remove pymoctool configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge pymoctool
References
Summary
In this tutorial we learn how to install pymoctool package on Ubuntu 22.04 using different package management tools: apt, apt-get and aptitude.
