The record heights in the UK for Douglas Fir have been confirmed with laser using Sine method as well as with climbing with direct tape drop and are reliable.
Indeed the Website of Tree Register of the British Isles gives not a lot of attention to the method of height measuring, but their most important measurers Owen Johnson, David Alderman and Rob Linley use laser rangefinders with Sine method.
The British Tree Register has a very large database with tree measurements from over 100.000 trees of many species, but it is open for members only.
Some tall trees in the UK see: http://www.monumentaltrees.com/en/gbr/hd1
Also, for the tallest record heights, the Tree Register has asked people like Michael Spraggon and others to climb trees with direct tape drop. In this way height records were measured for Douglas Fir as well as Grand Fir, Giand Sequoia, Coast Redwood, London Plane, European Beech and English Oak.
For species record heights in the UK see: http://www.monumentaltrees.com/en/heightrecords/gbr/
Indeed I have measured myself Douglas Fir of 64 metre / 210 ft in Wales and 61.3 m / 201 ft in SW England. The first one was climbed with tape drop by Michael Spraggon but has been felled after it had lost its top in a storm.
Tallest measured in Scotland is now 66.4 m / 217.8 ft, measured by Sine - laser as well as climbing with tape drop, see: http://www.monumentaltrees.com/en/gbr/s ... ack/15298/
In Wales at one location a tree has been measured this year of 68 m - 223 feet by Owen Johnson of the Tree Register as well as by Rob Linley (with a Nikon Forestry 550 laser). This is the tallest measured Douglas Fir in Europe for the moment.
For a map of Douglas fir heights measured by direct tape drop or laser (should all be with Sine method, although some of the users probably don't understand the mathematics of that method) see: http://www.monumentaltrees.com/en/map/w ... ouglasfir/
. The measurements in Germany and France also have been measured by tape drop as well as Sine laser method. Among the measurers in Germany of course are Kouta R. and Karlheinz Brüne, who have contributed to this BBS.
For a map of heights of all tree species in Europe see: http://www.monumentaltrees.com/en/map/europe/
and for some species of the world, although this is far from complete, as we prefer measurers to put their records themselves at his website: http://www.monumentaltrees.com/en/map/world/
Jeroen Philippona from the Netherlands, Europe