How to map large areas of windblown

[bewildered]

Hi

Just trying to update a map for a local event in a couple of weeks.

The area has had a lot of storm damage and is covered with patches of windblown trees. I've managed to identify where most of these are.

My question is, what symbol do I use for this?

All I have managed to find is that I should use the Dark Green - Very Difficult to Run symbol. This doesn't show it as extreme as it is, as whole areas have been flattened (60m x 200m), but would probably put people off venturing in. Any other suggestions?

Thanks

[Scott]

The wonderfully confused definition of the "dark green" symbol in ISOM is:

410 Vegetation: very difficult to run, impassable
An area of dense vegetation (trees or undergrowth) which is barely passable. Running reduced to ca. 0-20% of normal speed.

It sounds like your windblow would be covered under "impassable" and "0% of normal speed", so I'd go with dark green (and if it really is that bad, definitely don't use undergrowth screen!).

There's always the purple cross-hatch ("710 Dangerous area") if you think competitors might be at risk from toppling trees, although for legibility that probably shouldn't be used in combo with dark green.

[Tatty]

In the past we have been on areas where it is shown with vertical wide dark green and yellow stripes.

[pete.owens]

Thick forest with wide runnable rides running N-S?

[Snail]

Equally problematic are areas with slightly fewer (fallen) trees or heavy brashings but with sufficient bracken or similar vegetation that is high enough to cover the grot. So giving good long range visibility, but with localised areas of 0-20% runnability.

There was quite a bit of this on Saturday night - but it was mapped as 100% runnable!

[graeme]

If it's vegetation, and you can't get through, then it's dark green. I don't understand why people do anything else, but since they do it might be friendly to mention in the details.

[DavidJ]

I seem to recall, many years ago, we used dark green with a covering of black 'L' symbols - not sure why, or when it disappeared.

[Karen]

Always assumed L equals logged, ie felled or windblown

[Karen]

And it was a lot more useful for showing old felled areas that are grotty and slow than mapping them as rough open

[JK]

In the past we have been on areas where it is shown with vertical wide dark green and yellow stripes.

Showing your age (and/or the age of the map) !
Thankfully we now have ISOM!

I seem to recall, many years ago, we used dark green with a covering of black 'L' symbols - not sure why, or when it disappeared.

Presumably for simplification - if it is dark green, does it really matter why? I suppose one issue is that poor runnability is shown by light and medium green and/or stripey-green and there is no analogy for good visibility but poor runnability - but how many impenetrable bits of fight actually have good visibility (at least to people under 6')

And it was a lot more useful for showing old felled areas that are grotty and slow than mapping them as rough open

When the fallen trees have been cleared then it can be very grotty but passable, but a veg screen + rough open is fine for that.

[roadrunner]

I seem to recall, many years ago, we used dark green with a covering of black 'L' symbols - not sure why, or when it disappeared.

I seem to recall something like this being used for map corrections, back in the days when you had to mark up your own map.

[andypat]

Presumably for simplification - if it is dark green, does it really matter why?

I think to a lot of people it might - for example round here if I see an area of dark green in the middle of a bit of white forest I'd assume rhododendrons which might be useful as a control feature or an attackpoint. I'd probably be doubtful of using a windblown area for navigation simply becasue they usually arent mapped or are mapped very generally.

[Glucosamine]

if I see an area of dark green in the middle of a bit of white forest I'd assume rhododendrons which might be useful as a control feature or an attackpoint. I'd probably be doubtful of using a windblown area for navigation simply becasue they usually arent mapped or are mapped very generally.

Too often misused or unused, but is that not what the vegetation boundary symbol is intended to distinguish?

[Parkino]

what symbol do I use for this?

Simple answer (as Graeme said): dark green for impassable vegetation.

[bewildered]

Thanks for the advice.

I had pretty much come to the conclusion that Dark Green was the right answer.

What I might also do is point out that this will be used for thick conifer plantation and the windblown areas in the final details.

Now I just have to map the rest of the windblown and the felled areas and the plantation that has grown to 20 feet since last updated!