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## [task #15786] Column to calculate half the total area

**From**: |
Mohammad Akhlaghi |

**Subject**: |
[task #15786] Column to calculate half the total area |

**Date**: |
Tue, 6 Oct 2020 12:21:17 -0400 (EDT) |

**User-agent**: |
Mozilla/5.0 (X11; Linux x86_64; rv:81.0) Gecko/20100101 Firefox/81.0 |

URL:
<https://savannah.gnu.org/task/?15786>
Summary: Column to calculate half the total area
Project: GNU Astronomy Utilities
Submitted by: makhlaghi
Submitted on: Tue 06 Oct 2020 05:21:15 PM BST
Should Start On: Tue 06 Oct 2020 12:00:00 AM BST
Should be Finished on: Tue 06 Oct 2020 12:00:00 AM BST
Category: MakeCatalog
Priority: 5 - Normal
Item Group: Enhancement
Status: None
Privacy: Public
Percent Complete: 0%
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Effort: 0.00
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Details:
One useful measure for the morphology of an object is the area that contains
half of the total flux over a label. For example we can use the square root of
this area as an approximation of its effective radius. So it would be useful
to have such a column.
In practice, because this will involve sorting a label's pixels, we do already
have the main components: in the same function that we calculate the object's
median.
_______________________________________________________
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<https://savannah.gnu.org/task/?15786>
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**[task #15786] Column to calculate half the total area**,
*Mohammad Akhlaghi* **<=**