Quadtree and Sub-Grid Sampling FAQ: Difference between revisions
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=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 or does much less. The more 2d_zsh max/ridges are used the better. A rough estimate of SGS testing 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 <u>[[ASC_to_ASC | asc_to_asc utility]]</u> might be useful for creating additional breaklines.<br>
The reason for this is that SGS doesn't know where in the cell the low elevations and high elevations are, so it smooths out the breaklines. It allows water to flow from low point to low point within the same cell even if there is higher point in between them.
=If I run one SGS model, double the cell size and run the SGS model again, would I get the same results?=
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