Location

In addition to storing the time of change, also the location where the change happened is stored. The location is stored in worldwide GPS coordinates. The combination of time and location is called spacetime. It contains all information on when and where information has changed.

Location by GPS coordinates

If you update the value of a topic a default GPS location is set. If you allow the use of location on your mobile device or web browser the current location is used. If the location is unknown the default location specified in the server is used, for example your office or home location. To specify a specific location you can enter the GPS coordinates in the location field. The coordinates should be entered in decimal degrees separated by a , as used in Google Maps.

You can also specify the location by entering the location directly in the search box, for example weather.lisbon.temperature=27@51.361519, 5.316272, or in combination with the time weather.lisbon.temperature=27@51.361519, 5.316272, 2021-12-01 12:00.

To view the location in a 3D map click on 3D. If no data is found change the From date of the time interval to some value far in the past. In this view the location is displayed on a 3D map and the height of the marker is set by the value of the topic.

Location by reference

Instead of entering the GPS coordinates you can also refer to another topic with the prefix location. For example, you can create an topic location.lisbon.name with value Lisbon and position 51.361519, 5.316272. You can then use the subtopic following the location as a location, in this case lisbon. The use of named locations is very useful for locating assets, for example you can create a topic location.htc29.name=High Tech Campus 29, Eindhoven and then specify the position of the asset by entering htc29.