Quadtree and Sub-Grid Sampling FAQ: Difference between revisions
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=Why shouldn't I use Z Shape gully/min lines with SGS models?=
If the DEM is fine enough, SGS can preserve the gully along the cells without using any gully line. In such case using a gully line may overestimate the width of the flow path as it makes the entire cell and face flat.
=Why should I create more Z Shape ridge/max lines with SGS models?=
It is possible that without correct breaklines, SGS model allows a leak over a levee or embankment that model with smaller cell size does not. The more 2d_zsh max/ridges are used the better. A rough estimate of SGS testing has required twice the number of ridge lines compared to a traditional model. This also includes locations where there were no ridges previously. Breakline feature in asc_to_asc utility might be useful with creating additional breaklines.
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