Temporal Data
Temporal data relate to "time" and are stored on a temporal database. Temporal databases are optimised for storing and querying data relating to the occurrences of past, present and future events. ​A geotemporal database is optimised to link/ fuse spatial and temporal data to provide real-time opportunity data feeds in response to what’s on? where? and when? queries. For Key Performance Indicators (KPIs), Real-time Data Analytics are a necessary complement to both.


Aspects of Temporal Data 


1. Valid Time = the time period during which a fact is true in the real world.

2. Transaction Time = the time period during which a fact stored in the database was known.

3. Decision Time = the time period during which a fact stored in the database was decided to be valid.

​See also Transaction Time and Valid Time 


Temporal databases can be uni-temporal, bi-temporal or tri-temporal:

1. Uni-temporal (one axis of time)

1.1 Validity range or system time range time


2. Bi-temporal (two axes of time)
2.1 Valid time
2.2 transaction time or decision time


3. Tri-temporal (three axes of time)
3.1 Valid time.
3.2 Transaction time
3.3 Decision time.