The official height would be counted from the ground level. At the lowest lying entrance to the building if you ask CTBUH.
When doing a drawing for SSP, it can be more interesting to include the lowest point, which in rare cases can be on a lower level than the entrance.
It's common to mark the height above sea level (or other datum levels) on elevation drawings. In those cases it's important look at the whole drawing and substract the ground level from the top level.
I've seen many cases when the official height turned out to be the height above sea level.
The official height would be counted from the ground level. At the lowest lying entrance to the building if you ask CTBUH.
When doing a drawing for SSP, it can be more interesting to include the lowest point, which in rare cases can be on a lower level than the entrance.
It's common to mark the height above sea level (or other datum levels) on elevation drawings. In those cases it's important look at the whole drawing and substract the ground level from the top level.
I've seen many cases when the official height turned out to be the height above sea level.
yes, i have seen that too and thats what makes it confusing, especially when just heights are given with no known noted consideration of sea level or local site level. i guess in those cases we do not know for sure, but we would assume its from the ground level, even if you can never be fully certain without more info like sea level.
The cursor is always at a certain elevation when moving it over the map in Google Earth. It's shown in the lower right corner.
Provided there's laser scanned 3D-data for the area of interest, it's possible to put the cursor on top of a building and get the elevation, then get the elevation of the ground level and substract that from the top level elevation, to get the height of a building.
Not always 100 % accurate but most of the time it is. In most of the cases where official height doesn't match the height measured in Google Earth, there is an explanation. Like, the official height didn't count the penthouse/mechanical room on the roof, or the official height is height above sea level.
There may exist structures, which did not find - why ever - their way in official lists. An example for this is the 200 metres tall Leuna Chimney ( https://skyscraperpage.com/cities/?buildingID=149809 ) for which I would have made the request several years ago, if it was in an air-traffic obstacle list. I believe the reason why it is not there is that it was completed in 1989 at the collapse of the communist regime in former East Germany and by the perturbations at those days, it was forgotten to add to the air-traffic obstacle list. A similiar case may be the radio masts of Voinesti in Romania, from which I was not able to get a height value.
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