topic Re: horizon line (skyline, skyline-diagram) in 3D Questions

horizon line (skyline, skyline-diagram)

ReinhardPrestele — Thu, 15 Sep 2011 06:55:36 GMT

Hi,

for a site analysis I need the the distance and elevation angle from an observer point to objects at the horizon. I tried to implement this with the skyline and skyline-diagram function based on a raster DEM. So far, so good. But then the problems begin:

- "Skyline" doesn't use the elevation (Z-coordinate) of the observer point to draw the horizon line, but the elevation value of the raster. Is there a option to draw the skyline e.g. from a point two meters above the surface?

- "Skyline" actually includes a option to integrate earth's curvature, but it isn't possible to activate this option in the mentioned case. How it can be activated?

I would be glad if anyone have same ideas, because I spent a lot of time in esri-help and others without success...

Thanks,

rpres

Re: horizon line (skyline, skyline-diagram)

ReinhardPrestele — Fri, 23 Sep 2011 07:55:45 GMT

...the problem is still up-to-date. Are there any ideas?

Re: horizon line (skyline, skyline-diagram)

ThomasSlingsby — Tue, 27 Sep 2011 07:11:01 GMT

Hi,

Converting your Observer points to 3D points using the Feature to 3D by Attribute tool should solve your problems.

Alternately you could try setting the points base heights from the surface and applying an offset to raise them above the surface.

Re: horizon line (skyline, skyline-diagram)

LaurieRousseau-Nepton — Fri, 14 Mar 2025 13:31:18 GMT

Hi Thomas, Thanks for the information for the point's height.

The issue with the curvature option not showing up is still up-to-date.

It there any information regarding how it can be activated? I tested other tools that have this option with the same dataset and the option was there.

Re: horizon line (skyline, skyline-diagram)

LaurieRousseau-Nepton — Fri, 14 Mar 2025 15:15:49 GMT

Solution found! It turns out it really needs to be a mosaic created through mosaic dataset. Then the surface options are available in the Skyline tool.