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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" ;
byte NetLinkType(nNetLink) ;
NetLinkType:standard_name = "netlink_type" ;
NetLinkType:long_name = "type of netlink" ;
NetLinkType:flag_values = 0b, 1b ;
NetLinkType:flag_meanings = "First type of netlink
Second type 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 ;
