RJ Webb said:Units are irrelevant.
No they're not. I often work out heights from contours.
Quoted message said:Contour's job is to show the shape of the land.
And that.
Quoted message said:Besides 15m is also 15m.
And 15m is an inconvenient value when you're trying to work
out the approximate height of a specific location. Having
bold contours with values like 375m and 525m is just plain
daft (great if you like to convert back and think in feet,
but that doesn't work anyway - 525m = 1722ft) and having
"form lines" as you call them confuses the issue even more
(Harveys use a lot of "auxilary contours"😉. Using metric is
supposed to make things easier, not harder. 15m contours
don't contribute to ease of use.
Quoted message said:relative height is what bothers me..
Different people have different uses for maps.
Quoted message said:I want to know how much slog there is.. Just count them,.
I want to know absolute heights, so I have to check the non-
round value of the nearest thick contour line, count the
additional contours (making sure I don't accidentally
include any auxilary contours), multiply by 15, add to the
non-rounded figure. Simple eh?
I'm not saying I can't do that but I don't have that
much hassle with 10m contour lines. I'm not saying
it's particularly difficult, it's just not as simple
as it could be.
Quoted message said:Quoted message said:No, it's 10m.
Not in parts of Scotland isnt. It may be 10m.... Or it may
not. Minimum consistant Contour interval is 50m.
You're obsessing too much with steep slopes. Most contours
on most maps are 10m. Even if they do sometimes disappear
there's no problem with 50m intervals - every other one is a
nice round 100m interval, unlike the 75m bold contours on
Harveys maps, every four of which give a 300m interval - not
convenient!
Quoted message said:No a form line is an incomplete intermediate contour. ie a
10m contour on a biggish hill.
Formlines have ends, contours are loops.
Most 10m contours on most 50k maps are loops, not formlines.
Only occasionally do they disappear. Harveys "auxilary"
contours are a much better implementation of formlines, they
don't usually go on for long and they are dashed to
differentiate them (although it's not often very clear).
In fact, why do Harveys use so many auxilary contours?
Perhaps because the 15m interval is just to big, they
frequently need to fill in the gaps. They wouldn't have that
problem if they just used 10m intervals in the first place.
Paul
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