Geographical coordinates precision

[unilhexio]

I was importing a horizon profile from PVGIS when I realised that the coordinates used in project are not the same than the coordinates of the meteo database.

In the first picture you can see the site coordinates and in the second picture you can see the truncated coordinates for the project:

https://image.ibb.co/hZzc20/Screen-Shot-11-19-18-at-09-58-AM.jpghttps://image.ibb.co/kdj220/Screen-Shot-11-19-18-at-09-57-AM.jpg

This leads to a different horizon profile. Both locations are separated by 432 meters, enought to have a different horizon impact.

Edited November 30, 2018 by unilhexio

[André Mermoud]

You are right: the horizon evaluation is very sensitive to the exact position of the observer.

However the coordinates specified at the import time are well determined (4-decimal resolution, i.e. 11m), so that the Horizon line is well established by the provider.

Afterwards, loosing some accuracy on the project's position will not modify the horizon line, and therefore will not have any impact in your simulation.

[unilhexio]

In my case, this issue is involving a -0.2% of horizon shading losses.