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= Introduction =
With the release of TUFLOW 2020, the combination of Quadtree cellmesh and Sub-grid samplingSampling (SGS) method has offered great flexibility to build a model with a range of mesh sizes. However,SGS thissamples hasthe alsodigital createelevation model (DEM) at a neednumber toof "remap"points thewithin watera levelcell inand largecomputing Quadtreethe cellswater tosurface elevation as a DEMfunction withof muchcell finerstored resolutionvolume. WhileWith weSGS, arecells developingand highfaces resolutioncan SGSbe outputconsidered inas the"partially future releasewet", weand havethis alsomeans addedthe aimpact newof functionalitythe insub-grid thescale [[ASC_to_ASC|ASC_to_ASC]]geometry utilitycan tobe remaprepresented aby watercells levelwith gridlarger tosizes. The example below shows a finerQuadtree DEMmodel grid.with This10/20m pagecell introducesize howcan toconduct usewater theas ASC_to_ASCsmoothly remapas function,a and2.5/5/10/20m alsocell discusssizes themodel limitationalong ofa thenarrow methodstream.<br>
[[File:Fig1 H sgs.png|700px]]<br>
[[File:Fig2 H nonsgs.png|700px]]<br>
However, this has also create a need to "remap" the water level in large Quadtree cells to a DEM with much finer resolution. While we are developing high resolution SGS output in the future release, we have also added a new functionality in the [[ASC_to_ASC|ASC_to_ASC]] utility to remap a water level grid to a finer DEM grid. This page introduce how to use the ASC_to_ASC remap function, and also discuss the limitation of the method.
=Base Case=
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