The horizon file to be uploaded to our web site should be a simple text file, such as you can create using a text editor (such as Notepad for Windows), or by exporting a spreadsheet as comma-separated values (.csv). There should be one number per line, with each number representing the horizon height in degrees in a certain compass direction around the point of interest.
The horizon heights in the file should be given in a counterclockwise direction starting at East; that is, from East going to North, West, South, and back to East. The values are assumed to represent equal angular distance around the horizon. For instance, if you have 36 values in the file, PVGIS assumes that the first point is due east, the next is 10 degrees north of east, and so on, until the last point, 10 degrees south of east.
