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--- en:documentation:observatory [2014/03/25 07:49] – [Observatory] time zone is now UTC pch
+++ en:documentation:observatory [2025/08/20 15:19] (current) – [Use an horizon picture] dokuadmin
@@ Line 87: / Line 87: @@
 If "High quality" is checked a point is computed for every screen pixel of the map. Otherwise it compute a point only every four pixel. See the discussion about the performance below.
-This function is compatible with the horizon made for [[http://www.stellarium.org|Stellarium]] using the [[http://www.stellarium.org/wiki/index.php/Customising_Landscapes#Single_Panorama_Method|Single Panorama Method]].\\
+This function is compatible with the horizon made for [[http://www.stellarium.org|Stellarium]] using the [[https://stellarium.org/guide/#pf65|Single Panorama Method]].\\
-So the quickest way to test it is to get a [[http://www.stellarium.org/wiki/index.php/Landscapes|landscape file]] for Stellarium. Just be sure the format is compatible by looking at the row "type = spherical" in the landscape.ini file.\\
+So the quickest way to test it is to get a [[https://stellarium.org/en/landscapes.html|landscape file]] for Stellarium. Just be sure the format is compatible by looking at the row "type = spherical" in the landscape.ini file.\\
-For example download the [[http://www.waldvogel.com/stellarium/landscape_jungfraujoch.zip|Jungfraujoch panorama]], unzip the file in your home folder.\\
+For example download the [[https://www.ap-i.net/pub/skychart/horizon/landscape_jungfraujoch.zip|Jungfraujoch panorama]], unzip the file in your home folder.\\
 Launch Skychart and open the observatory setting, add an observatory location for Jungfraujoch as show here (location is not automatically set from landscape.ini but you can look at the file to get the right value):\\
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 Select a moment you get the most uniform lighting in every direction. A uniform high cloud cover can be good.\\
 Get a sequence of picture for the whole horizon, be sure to have enough overlap between the pictures.\\
-Use a panorama software like [[http://hugin.sourceforge.net/|Hugin]] to assemble the pictures. Convert the result to PNG format to support transparency. Then use [[http://www.gimp.org/|GIMP]] to set the sky transparent using one of the [[https://www.google.com/#q=gimp+mask+transparency|numerous method]] available, I found that creating a sky mask first work fine.\\
+Use a panorama software like [[http://hugin.sourceforge.net/|Hugin]] to assemble the pictures. Convert the result to PNG format to support transparency. Then use [[http://www.gimp.org/|GIMP]] to set the sky transparent using one of the [[https://www.google.com/search?q=gimp+mask+transparency|numerous method]] available, I found that creating a sky mask first work fine.\\
 Finally reduce the panorama size to a reasonable value, 4096 or 8192 pixel width.
-If you observe from a mountainous area I also get success by using an [[http://www.udeuschle.de/Panoramen.html| online panorama generator]]. In the form set your coordinates and "Left edge=90", "Right edge=90", "Tilt=0", "Elev. exaggeration=1". Show the panorama, save all the tiles and assemble in GIMP or using the "montage" command from ImageMagick.
+For mountainous area it possible to use an [[panorama| online panorama generator]].\\
+The condition is the horizon is limited by remote mountain, this not work for tree or nearby buildings.
+{{:en:documentation:horizon4.png?600|}}