![]() ![]() Assign attributes to the points/arcs/polygons in the coverage to control the mesh characteristics.This is the region to be covered by the mesh. Define a map module coverage consisting of polygons that cover the modeling domain.Define a bathymetric source (scatter set or raster/DEM).This method includes the following general steps: The recommended method for creating unstructured grids (meshes) in SMS for use with either finite element or finite volume engines is to use the conceptual modeling approach. The second figure shows a 2D mesh created from the polygons.ĢD Mesh created from map objects using Map → 2D Mesh command The figure domain of a floodplain using the feature objects in the Map Module. The Map → 2D Mesh command creates a 2D mesh on the interior of all of the polygons in the current coverage. Once a set of feature objects has been created for a coverage (conceptual model) associated with a finite element based model such as RMA2, FESWMS, ADCIRC or CGWAVE, the Map → 2D Mesh command can be used to generate a 2D finite element mesh from the objects. Extracting cross sections with feature arcs is only way to generate cross section information, they also can be imported from spreadsheet files (cut and paste), or entered manually. The cross section database can also be edited independently using the Cross Section Editor tools. SMS stores all of the cross section information in a text database file. When extracting the cross sections, a prompt will ask for the name of a cross section database file. Line properties can be determined from an area property coverage by intersecting the cross-section arcs with the area property polygons and marking them in the cross section database. The AutoMark option will examine the elevations of the extracted cross sections and try to infer the thalweg (low point) and the left and right bank points (change of slope) automatically. Point properties (thalweg, left bank, right bank) can be defined from a 1D-Hydraulic Centerline coverage, or by AutoMark. If not cross-sections are selected then the Use All Cross Sections option is used. The Extract Cross Sections command uses the cross section arcs and a digital terrain model (TINs are the only source that can currently be used) to extract the elevations at vertices of the feature arc cross-sections, or at the intersection points with the triangles.Ĭross Sections for individual arcs may be extracted by selecting the arc(s) before choosing the Extract Cross Sections command. ![]()
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May 2023
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