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About btate

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  1. We had a very similar problem for a flood mapping job in Melbourne. We had photogrammetry of our study area and some detailed survey along an important road with an embankment. The survey was taken as regular cross sections across the road and embankment. We created some polylines along the road crest, gutter, top of curb and top of embankment and then created a tin of the survey using the polylines as breaklines in 12D. We then created a tin of the photogrammetry and then created a super tin (merged the 2 tins in 12D). This creates a grid that you can use for mapping purposes. For modelling in TUFLOW we used the photogrammetry breaklines as 2D zlines to ensure that the crests, gutters, pavements were represented well in the model, so we updated the breaklines using the new survey data. I understand that you have LiDAR so probably do not have breaklines, but for any small important features you probably should use the 2D zlines, very easy to extract from a well constructed tin, or digitise up manually. Cheers
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