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Creating 1d Tuflow cross sections


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I'm trying to create cross sections using the extract from scatter tool on the cross sections coverage.

Every time I receive an error message - "Some of the elevations for the cross-sections were extrapolated. You may want to use smaller cross-sections or increase the size of your scatterset".

Apparently after doing this I should be able to right click on the cross sections coverage and select Map Materials From Area Coverage, but I guess the first stage isn't working correctly as I do not have this option.

I also can't delete out any unwanted cross section arcs (I definitely have the map module selected).

Any ideas?

Thanks very much

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