"I've got Measure that has inclinometer but not azimuth", all you need is a compass.
But you might find it easier to use google satellite and just do a rough segmentation by the compass points, easy to calculate distance to obstruction as well. Also, do you need to go below 35/45degrees? That would make your object/boundaries a little less complex.
You might want to try and save a basic horizon with one or two changes and locate the new file. See if its txt/tabulated based, you might find it easier just to fill in the extra rows.
Steve
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