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Unstructured grid as a net
- The unstructured grid is a set of net nodes (coordinates) and a set of net links connecting them.
- Flow data is defined on net cells (naming might change). Cells have a (circum-)center (water level point). The entire cell is defined through its contour line (
bounds: NetcellContour_x/y
). The contour line contains the coordinates of surrounding net nodes for 2D cells and generated coordinates for 1D channels/manholes/etc.
Examples
UNSTRUC map file with 2D cells on lon/lat-grid.
netcdf test_map { dimensions: nNetNode = 178907 ; nNetLink = 363472 ; nNetLinkPts = 2 ; nNetCell = 184324 ; nNetCellMaxNode = 7 ; nNetCellContourPts = 99 ; nNetCellLink = 349141 ; nNetCellLinkPts = 2 ; time = UNLIMITED ; // (1 currently) variables: double NetNode_x(nNetNode) ; NetNode_x:units = "degrees_east" ; NetNode_x:standard_name = "longitude" ; NetNode_x:long_name = "netnodal lon-coordinate" ; double NetNode_y(nNetNode) ; NetNode_y:units = "degrees_north" ; NetNode_y:standard_name = "latitude" ; NetNode_y:long_name = "netnodal lat-coordinate" ; double NetNode_z(nNetNode) ; int NetLink(nNetLink, nNetLinkPts) ; NetLink:standard_name = "netlink" ; NetLink:long_name = "link between two netnodes" ; int NetLinkType(nNetLink) ; NetLinkType:standard_name = "netlink_type" ; NetLinkType:long_name = "type (1 or 2) of netlink" ; double time(time) ; time:units = "seconds since 2010-01-01 00:00:00" ; double NetCell_xc(nNetCell) ; NetCell_xc:units = "degrees_east" ; NetCell_xc:standard_name = "longitude" ; NetCell_xc:long_name = "Net cell circumcenter x" ; NetCell_xc:bounds = "NetCellContour_x" ; double NetCell_yc(nNetCell) ; NetCell_yc:units = "degrees_north" ; NetCell_yc:standard_name = "latitude" ; NetCell_yc:long_name = "Net cell circumcenter y" ; NetCell_yc:bounds = "NetCellContour_y" ; double NetCellContour_x(nNetCell, nNetCellContourPts) ; NetCellContour_x:units = "degrees_east" ; NetCellContour_x:standard_name = "longitude" ; NetCellContour_x:long_name = "List of x-points forming netcell" ; double NetCellContour_y(nNetCell, nNetCellContourPts) ; NetCellContour_y:units = "degrees_north" ; NetCellContour_y:standard_name = "latitude" ; NetCellContour_y:long_name = "List of y-points forming netcell" ; int NetCellNode(nNetCell, nNetCellMaxNode) ; NetCellNode:standard_name = "netcell_node" ; NetCellNode:long_name = "Mapping from net cell to net nodes (first column is node count, will change)." ; NetCellNode:netcell_coords = "NetCell_xc NetCell_yc" ; int NetCellLink(nNetCellLink, nNetCellLinkPts) ; double s1(time, nNetCell) ; s1:cell_methods = "area: mean" ; s1:coordinates = "NetCell_xc Netcell_yc" ; s1:grid_mapping = "crs" ; double ucx(time, nNetCell) ; ucx:cell_methods = "area: point" ; ucx:coordinates = "NetCell_xc Netcell_yc" ; ucx:grid_mapping = "crs" ; double ucy(time, nNetCell) ; ucy:cell_methods = "area: point" ; ucy:coordinates = "NetCell_xc Netcell_yc" ; ucy:grid_mapping = "crs" ; int crs ; crs:grid_mapping_name = "latitude_longitude" ; crs:longitude_of_prime_meridian = 0.f ; crs:semi_major_axis = 6378137.f ; crs:inverse_flattening = 298.2572f ; // global attributes: :institution = "Deltares" ; :references = "http://www.deltares.nl" ; :source = "UNSTRUC v1.0.11.10021:1007, model csmcourant" ; :history = "Created on 2010-01-06T15:35:40+0100, UNSTRUC" ; :Conventions = "CF-1.4,Deltares" ; data: NetNode_x = 10.7736671537707, 10.775, 10.7783013103449, 10.775, 10.775, 10.80625, 10.7839111680939, 10.80625, 10.8375, 10.80625, 10.80625, // ... NetLink = 80895, 80882, 167568, 167573, 108907, 109422, // ... NetLinkType = 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // ... time = 0.0300439515169901 ; NetCell_xc = 10.7743335768854, 10.7743335913705, 10.7906249344082, NetCellContour_x = 10.7736671537707, 10.775, 10.775, _, _, _, _, _, // ... 10.775, 10.7783013103449, 10.80625, 10.80625, 10.775, _, _, _, _, _, _, _, // ... NetCellNode = 3, 1, 2, 5, _, _, _, 3, 1, 5, 4, _, _, _, 5, 2, 3, 6, 8, 5, _, // ... NetCellLink = 1, 2, 1, 3, // ... s1 = 4.78405906502741e-001, 5.63697801327623e-001, 2.44636456454523e-001, 7.54911502823542e-001, 2.32821367302938e-001, 1.96039340036838e-001, 5.73297867243609e-001, 2.28008030376163e-001, 3.37509917682617e-001, // ... crs = 4326 ;