C R Fishwick said:Anyone know whether
anyone one has indeed "sumitted" on all the "tops" that have a trig
point?
Quoted message said:"Nigel Cliffe" <[email hidden]> wrote
Quoted message said:Quoted message said:Quoted message said:> Depends on your definition of a "top" with a trig point. If you
> just mean visiting all the trigs, I believe there are over 7,000
> of them in the UK.
It's important to be aware that many trigs are not on the "top" of anything.
Although many were placed directly on summits, their purpose was not to mark
the highest point, but to create a network of visible points to use as a
basis for mapping the country. Therefore visibility from other trigs was the
most important thing. Very often the highest point was visible from other
points, but often it wasn't, particularly if it needed to be seen from lower
down, in which case trigs would be placed on crests instead (often near to
the top, but not directly on it).
So if you were to filter the list of 7000+ trigs to include only the ones
that actually mark summits, you'd end up with a much shorter list. Has
anyone ever produced such a list?
Of course, there is a grey area, depending how strictly you interpret the
meaning of "top". If by "top" you mean the actual highest point, many trigs
are not placed exactly on the top. A lot of tops are marked by cairns for
example, and the trig is placed just a few metres away. Garreg Lwyd is a
good example of this. In other cases the trig may appear to mark the summit
on the map, but when you get there it doesn't. Arenig Fach for example has a
trig and a cairn, but neither mark the summit. There's an obvious higher
point a short distance away which isn't marked by anything, but you can't
tell that from the map. Most people probably assume the trig to mark the
summit though.
So if you want to be really strict about it, this would weed out a lot of
apparent "summit" trigs, but if you're not that strict you could include
them, provided they are pretty close to the top. I guess you'd have to
decide how close they'd need to be to qualify. For example, I wouldn't
include the trig on Drygarn Fawr, which is 65m away from the summit cairn
and is 4m lower. The trig on Fan Fawr definitely wouldn't qualify, being
665m away from the summit!
Then there's the issue of height. Most summit lists only list summits above
a particular altitude, so if you wanted to limit yourself to "tops" that are
included in existing lists, you'd end up with a very short list indeed.
Of course, you could set your own altitude limit, like say 300m (1000ft) for
example. This would weed out all the trigs on tiny hills. But again, you
might end up with quite a short list. In fact, it would be much simpler to
set an altitude limit and bag all trigs above that altitude, irrespective of
whether they're on summits or not. This would give you a much shorter and
more practical list. If you set a limit of say 500m or 600m, you'd stay
within the realm of hill walking, so you wouldn't have to bother with all
those low level farmland trigs.
Here's a list of the number of trigs over certain altitudes:
Over 1000m - 37 trigs
Over 900m - 72 trigs
Over 800m - 137 trigs
Over 700m - 239 trigs
Over 600m - 392 trigs
Over 500m - 676 trigs
Over 400m - 1160 trigs
Over 300m - 1813 trigs
So as you can see, the numbers of high altitude trigs are quite manageable.
Of course, you could further sub-divide these lists by including only
certain areas, so for example you could do all the trigs in England over
600m, or all the trigs in the Lake District over 300m. Or simply all the
trigs in the Lake District. Whatever suits your preference.
Another way of doing it would be to bag all the trigs that are located on
open ground (i.e. non-farmland, forestry or urban), although compiling such
a list would take quite a bit of study, you'd need to use aerial photographs
for that. And again you could limit yourself to a pariticular area. This
would avoid access problems and ensure that all the trigs you visited were
"wild".
Quoted message said:Lol, I've changed my mind, I won't bother, although my count at the
moment is X -)
Don't give up on trigs just yet. As you can see, there are plenty of ways to
cut down the list to a manageable size and still provide yourself with a
challenge.
Paul
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