TG-map4
first of all the former height (97) was definitely wrong. The region around here is already in the 3-digit-area when it comes to height above sea level. We fortunately have a legal source that we can use: NRW-Atlas. In there you find height lines in the "Digitale Topografische Karte" which show 280m as last ring around the mountain top. The exact number is shown in the "Deutsche Grundkarte": 284.4. This is official data and right. I have corrected it. Note fixed.