<p>What are examples of spatio-temporal data sets such that subjects are observed only once and are, thus, indexed in time only once?</p>
<p>Here's a hypothetical example in the ecology realm: consider a tree's first year of life as the subject of interest. Each tree can only have <em>one</em> first year of life. Additionally, trees cannot move in space. So, for each subject, we can only have one observation, indexed in space and time.</p>
<p>What are some astronomy data sets that you have come across that are similar to the format of this data set?</p>

CC BY-SA 4.0
2023-05-25T04:53:07.017Z
Asteroids and comets come to mind. It has happened multiple times that certain asteroids were observed once (or twice), but never seen again. It happened even to a friend of mine: He positively discovered an asteroid, but only saw it one evening, so it wasn’t enough to calculate an orbit, and the next few evenings were cloudy, so he never saw it again. (Fortunately for him, he managed to discover four more whose orbits were tracked, including 74503 Madola.
Pierre Paquette
CC BY-SA 4.0
2023-05-25T06:33:54.993Z
Are you asking for lists of short lived events?
James K
CC BY-SA 4.0
2023-05-25T06:39:30.290Z
Any catalog of classical novae or supernovae. Or gamma-ray bursts, or gravitational-wave sources, or …
Peter Erwin
CC BY-SA 4.0
2023-05-25T07:19:46.020Z
OK, most gravitational-wave sources are not very well indexed in space...
Peter Erwin
CC BY-SA 4.0
2023-05-25T13:19:03.377Z
@PierrePaquette Thank you for the recommendation!
Ron Snow
CC BY-SA 4.0
2023-05-25T13:19:38.267Z
@JamesK Short-lived events that are only observed once in time.
Ron Snow
CC BY-SA 4.0
2023-05-25T13:19:59.183Z
@PeterErwin Thank you for the list. I'll look into those :)
Ron Snow
<data-analysis><raw-data>
What are examples of spatio-temporal data sets such that subjects are observed only once and are, thus, indexed in time only once?
Ron Snow
# What are examples of spatio-temporal data sets such that subjects are observed only once and are, thus, indexed in time only once?

(Asked by: username_0 on 2023-05-24)

What are examples of spatio-temporal data sets such that subjects are observed only once and are, thus, indexed in time only once?

Here's a hypothetical example in the ecology realm: consider a tree's first year of life as the subject of interest. Each tree can only have *one* first year of life. Additionally, trees cannot move in space. So, for each subject, we can only have one observation, indexed in space and time.

What are some astronomy data sets that you have come across that are similar to the format of this data set?

**Tags:** data-analysis, raw-data

> **Comments:**
> **username_1**: Asteroids and comets come to mind. It has happened multiple times that certain asteroids were observed once (or twice), but never seen again. It happened even to a friend of mine: He positively discovered an asteroid, but only saw it one evening, so it wasn’t enough to calculate an orbit, and the next few evenings were cloudy, so he never saw it again. (Fortunately for him, he managed to discover four more whose orbits were tracked, including 74503 Madola.  
> **username_2**: Are you asking for lists of short lived events?  
> **username_3**: Any catalog of classical novae or supernovae. Or gamma-ray bursts, or gravitational-wave sources, or …  
> **username_3**: OK, most gravitational-wave sources are not very well indexed in space...  
> **username_0**: @PierrePaquette Thank you for the recommendation!  
> **username_0**: @JamesK Short-lived events that are only observed once in time.  
> **username_0**: @PeterErwin Thank you for the list. I'll look into those :)  

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