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D-Flow FM (formerly Unstruc) is a shallow water flow solver on flexible meshes (also known as 'unstructured grids'). The output data of D-Flow are stored in NetCDF files. Since a convention for storing unstructured grid data in NetCDF files didn't exist, we have started to define an extension to the CF standard. Meanwhile this effort has been linked to other international initiatives, and the latest proposal for the conventions can be found on this unstructured grid page. Although we lead and follow these developments, we also want to keep the output files relatively stable, hence the D-Flow FM output files don't always follow the proposed conventions exactly. This page describes the format of the NetCDF files that are currently produced by D-Flow FM.

...

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

Table of Content Zone

location	top
type	list

UNSTRUC

D-Flow FM net file with 2D cells on lon/lat-grid.

New version (Mar '10) with additional NetLinkType 0 (closed 2D link/thin dams), and netcell (=NetElem) data + boundary data (intended for use in RGFGRID)

Code Block

netcdf courantc_net {
dimensions:
        nNetNode = 178907 ;
        nNetLink = 363286 ;
        nNetLinkPts = 2 ;
        nBndLink = 14337 ;
        nNetElem = 184189 ;
        nNetElemMaxNode = 7 ;
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:long_name = "type of netlink" ;
                NetLinkType:valid_range = 0, 2 ;
                NetLinkType:flag_values = 0, 1, 2 ;
                NetLinkType:flag_meanings = "closed_link_between_2D_nodes link_between_1D_nodes link_between_2D_nodes" ;
        int NetElemNode(nNetElem, nNetElemMaxNode) ;
                NetElemNode:long_name = "Mapping from net cell to net nodes." ;
        int BndLink(nBndLink) ;
                BndLink:long_name = "Netlinks that compose the net boundary." ;
        int NetElemLink(nNetElemLink, nNetElemLinkPts) ;
                NetElemLink:long_name = "link between two netelems" ;

// global attributes:
                :institution = "Deltares" ;
                :references = "http://www.deltares.nl" ;
                :source = "UNSTRUC v1.0.11.10693:1069, model" ;
                :history = "Created on 2010-03-05T09:41:31+0100, UNSTRUC" ;
                :Conventions = "CF-1.4:Deltares-0.1" ;
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 =
  23381, 23382,
  32338, 32341,
// ...
 NetLinkType = 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2,
// ...
 NetElemNode =
  1, 2, 5, _, _, _, _,
  1, 5, 4, _, _, _, _,
// ...
 BndLink = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
    20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
// ...

UNSTRUC

D-Flow FM map file with 2D cells on lon/lat-grid.

Code Block

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 of netlink" ;
                NetLinkType:valid_range = 1, 2 ;
                NetLinkType:flag_values = 1, 2 ;
                NetLinkType:flag_meanings = "link_between_1D_nodes link_between_2D_nodes" ;
        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-0.1" ;
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 = 1, 1, 1, 1, 1, 1, 1, 1, 
// ...
 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 ;

UNSTRUC

D-Flow FM map file with staggered solution variables (concept)

TODO: replace normal velocity by u/v at edge?

Code Block

netcdf test_map {
dimensions:
        nNetNode = 706 ;
        nNetLink = 1313 ;
        nNetLinkPts = 2 ;
        nBndLink = 104 ;
        nNetElem = 610 ;
        nNetElemMaxNode = 7 ;
        nFlowElem = 665 ;
        nFlowElemMaxNode = 6 ;
        nFlowElemContourPts = 99 ;
        nNetElemLink1D = 65 ;
        nNetElemLink = 1078 ;
        nNetElemLinkPts = 2 ;
        nFlowLink = 1143 ;
        nFlowLinkPts = 2 ;
        time = UNLIMITED ; // (1 currently)
variables:
        double NetNode_x(nNetNode) ;
                NetNode_x:units = "m" ;
                NetNode_x:standard_name = "projection_x_coordinate" ;
                NetNode_x:long_name = "netnodal x-coordinate" ;
        double NetNode_y(nNetNode) ;
                NetNode_y:units = "m" ;
                NetNode_y:standard_name = "projection_y_coordinate" ;
                NetNode_y:long_name = "netnodal y-coordinate" ;
        double NetNode_z(nNetNode) ;
        int NetLink(nNetLink, nNetLinkPts) ;
                NetLink:standard_name = "netlink" ;
                NetLink:long_name = "link between two netnodes" ;
        int NetLinkType(nNetLink) ;
                NetLinkType:long_name = "type of netlink" ;
                NetLinkType:valid_range = 0, 2 ;
                NetLinkType:flag_values = 0, 1, 2 ;
                NetLinkType:flag_meanings = "closed_link_between_2D_nodes link_between_1D_nodes link_between_2D_nodes" ;
        int NetElemNode(nNetElem, nNetElemMaxNode) ;
                NetElemNode:long_name = "Mapping from net cell to net nodes." ;
        int BndLink(nBndLink) ;
                BndLink:long_name = "Netlinks that compose the net boundary." ;
        double time(time) ;
                time:units = "seconds since 1992-08-31 00:00:00" ;
        double FlowElem_xcxcc(nFlowElem) ;
                FlowElem_xcxcc:units = "m" ;
                FlowElem_xcxcc:standard_name = "projection_x_coordinate" ;
                FlowElem_xcxcc:long_name = "Flow element circumcenter x" ;
                FlowElem_xcxcc:bounds = "FlowElemContour_x" ;
        double FlowElem_ycycc(nFlowElem) ;
                FlowElem_ycycc:units = "m" ;
                FlowElem_ycycc:standard_name = "projection_y_coordinate" ;
                FlowElem_ycycc:long_name = "Flow element circumcenter y" ;
                FlowElem_ycycc:bounds = "FlowElemContour_y" ;
        double FlowElemContour_x(nFlowElem, nFlowElemContourPts) ;
                FlowElemContour_x:units = "m" ;
                FlowElemContour_x:standard_name = "projection_x_coordinate" ;
                FlowElemContour_x:long_name = "List of x-points forming flow element" ;
        double FlowElemContour_y(nFlowElem, nFlowElemContourPts) ;
                FlowElemContour_y:units = "m" ;
                FlowElemContour_y:standard_name = "projection_y_coordinate" ;
                FlowElemContour_y:long_name = "List of y-points forming flow element" ;
        int FlowLink(nFlowLink, nFlowLinkPts) ;
                FlowLink:long_name = "link/interface between two flow elements" ;
        int FlowLinkType(nFlowLink) ;
                FlowLinkType:long_name = "type of flowlink" ;
                FlowLinkType:valid_range = 1, 2 ;
                FlowLinkType:flag_values = 1, 2 ;
                FlowLinkType:flag_meanings = "link_between_1D_flow_elements link_between_2D_flow_elements" ;
        double FlowLink_xexu(nFlowLink) ;
                FlowLink_xexu:long_name = "Center coordinate of net link (velocity point)." ;
                FlowLink_xexu:units = "m" ;
                FlowLink_xexu:standard_name = "projection_x_coordinate" ;
        double FlowLink_yeyu(nFlowLink) ;
                FlowLink_yeyu:long_name = "Center coordinate of net link (velocity point)." ;
                FlowLink_yeyu:units = "m" ;
                FlowLink_yeyu:standard_name = "projection_y_coordinate" ;
        double s1(time, nFlowElem) ;
                s1:coordinates = "FlowCellFlowElem_xcxcc FlowCellFlowElem_ycycc" ;
        double ucx(time, nFlowElem) ;
                ucx:coordinates = "FlowCellFlowElem_xcxcc FlowCellFlowElem_ycycc" ;
        double ucy(time, nFlowElem) ;
                ucy:coordinates = "FlowCellFlowElem_xcxcc FlowCellFlowElem_ycycc" ;
        double unorm(time, nFlowLink) ;
                unorm:standard_name = "normal_velocity" ;
                unorm:units = "m s-1" ;
                unorm:interfaces = "FlowLink" ;
                unorm:coordinates = "FlowLink_xexu FlowLink_yeyu" ;

// global attributes:
                :institution = "Deltares" ;
                :references = "http://www.deltares.nl" ;
                :source = "UNSTRUC v1.0.11.10693:1069, model" ;
                :history = "Created on 2010-03-08T13:23:31+0100, UNSTRUC" ;
                :Conventions = "CF-1.4:Deltares-0.1" ;
data:

 NetNode_x = 1078.99694824, 1068.75195312, 1110.4510498, 1123.6159668,
    1032.6619873, 1023.13500977, 984.9420166, 974.37200928, 936.1550293,
    922.88897705, 886.71002197, 868.85601807, 837.2210083, 812.21697998,
// ...
 time = 10.7142857142857 ;

 FlowElem_xcxcc = 1800.29010953126, 1827.13454757167, 1892.73565627098,
// ...
 FlowElemContour_x =
  1799.14001465, 1843.04504395, 1796.97290039, 1758.60998535, _, _, _, _, _,
    _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
    _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
    _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
    _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _
// ...
 FlowLink =
  1, _2,
 _ 2, _, _, _, _, _, _, _,
    _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
// ...
 FlowLink =
  1, 2,
  2, 9,

UNSTRUC map file with z-layers (concept)

9,

D-Flow FM map file with z-layers (concept)

Code Block


netcdf test_map {
dimensions:
        nNetNode = 706 ;
        nNetLink = 1313 ;
        nNetLinkPts = 2 ;
        nFlowElem = 665 ;
        nFlowElemMaxNode = 6 ;
        nFlowElemContourPts = 99 ;
        nFlowLink = 1143 ;

Code Block


netcdf test_map {
dimensions:
        nNetNodenFlowLinkPts = 7062 ;
        nNetLinknLayer = 1313 5;
        nNetLinkPtstime = 2UNLIMITED ; // (1 currently)
variables:
        nFlowElem = 665double NetNode_x(nNetNode) ;
        nFlowElemMaxNode = 6 ;
        nFlowElemContourPtsNetNode_x:units = 99"m" ;
        nFlowLink = 1143 ;
        nFlowLinkPts = 2NetNode_x:standard_name = "projection_x_coordinate" ;
        nLayer = 5;
        timeNetNode_x:long_name = UNLIMITED ; // (1 currently)
variables:"netnodal x-coordinate" ;
        double NetNode_xy(nNetNode) ;
                NetNode_xy:units = "m" ;
                NetNode_xy:standard_name = "projection_xy_coordinate" ;
                NetNode_xy:long_name = "netnodal xy-coordinate" ;
        double NetNode_yz(nNetNode) ;
        int NetLink(nNetLink, nNetLinkPts) ;
                NetNode_y:unitsNetLink:standard_name = "mnetlink" ;
                NetNode_yNetLink:standardlong_name = "projection_y_coordinatelink between two netnodes" ;
        int NetLinkType(nNetLink) ;
       NetNode_y         NetLinkType:long_name = "netnodal y-coordinatetype of netlink" ;
        double NetNode_z(nNetNode) ;
         NetLinkType:valid_range int= NetLink(nNetLink0, nNetLinkPts)2 ;
                NetLinkNetLinkType:standardflag_namevalues = "netlink"0, 1, 2 ;
                NetLinkNetLinkType:longflag_namemeanings = "closed_link_between_2D_nodes link_between two netnodes_1D_nodes link_between_2D_nodes" ;
        intdouble NetLinkTypetime(nNetLinktime) ;
                time:units = "seconds since 1992-08-31 00:00:00" ;
        double NetLinkType:long_name = "type of netlink" FlowElem_xcc(nFlowElem) ;
                NetLinkType:valid_rangeFlowElem_xcc:units = 0, 2 "m" ;
                NetLinkTypeFlowElem_xcc:flagstandard_valuesname = 0, 1, 2"projection_x_coordinate" ;
                NetLinkTypeFlowElem_xcc:flaglong_meaningsname = "closed_link_between_2D_nodes link_between_1D_nodes link_between_2D_nodes" ;
        double time(time)Flow element circumcenter x" ;
                timeFlowElem_xcc:unitsbounds = "seconds since 1992-08-31 00:00:00FlowElemContour_x" ;
        double FlowElem_xcycc(nFlowElem) ;
                FlowElem_xcycc:units = "m" ;
                FlowElem_xcycc:standard_name = "projection_xy_coordinate" ;
                FlowElem_xcycc:long_name = "Flow element circumcenter xy" ;
                FlowElem_xcycc:bounds = "FlowElemContour_xy" ;
        double FlowElemFlowElemContour_ycx(nFlowElem, nFlowElemContourPts) ;
                FlowElemFlowElemContour_ycx:units = "m" ;
                FlowElemFlowElemContour_ycx:standard_name = "projection_yx_coordinate" ;
                FlowElemFlowElemContour_ycx:long_name = "FlowList elementof circumcenter y" ;
                FlowElem_yc:bounds = "FlowElemContour_yx-points forming flow element" ;
        double FlowElemContour_xy(nFlowElem, nFlowElemContourPts) ;
                FlowElemContour_xy:units = "m" ;
                FlowElemContour_xy:standard_name = "projection_xy_coordinate" ;
                FlowElemContour_xy:long_name = "List of xy-points forming flow element" ;
        doubleint FlowElemContour_yFlowLink(nFlowElemnFlowLink, nFlowElemContourPtsnFlowLinkPts) ;
                FlowElemContour_y:unitsFlowLink:long_name = "m"link/interface between two flow elements" ;
        int FlowLinkType(nFlowLink) ;
                FlowElemContour_yFlowLinkType:standardlong_name = "projection_y_coordinatetype of flowlink" ;
                FlowElemContour_yFlowLinkType:longvalid_namerange = "List of y-points forming flow element" ;
 1, 2 ;
                FlowLinkType:flag_values int= FlowLink(nFlowLink1, nFlowLinkPts)2 ;
                FlowLinkFlowLinkType:longflag_namemeanings = "link/interface between two flow _between_1D_flow_elements link_between_2D_flow_elements" ;
        intdouble FlowLinkTypeFlowLink_xu(nFlowLink) ;
                FlowLinkTypeFlowLink_xu:long_name = "typeCenter coordinate of flowlink"net ;
link (velocity               FlowLinkType:valid_range = 1, 2 point)." ;
                FlowLinkType:flag_valuesFlowLink_xu:units = 1, 2"m" ;
                FlowLinkTypeFlowLink_xu:flagstandard_meaningsname = "linkprojection_between_1D_flow_elements link_between_2D_flow_elementsx_coordinate" ;
        double FlowLink_xeyu(nFlowLink) ;
                FlowLink_xeyu:long_name = "Center coordinate of net link (velocity point)." ;
                FlowLink_xeyu:units = "m" ;
                FlowLink_xeyu:standard_name = "projection_x_coordinatey_coordinate" ;
        double FlowElem_zc(nFlowElem, nLayer) ;
                FlowElem_zc:long_name = "Vertical coordinates of layers underlying each FlowElement." ;
               double FlowLink_ye(nFlowLink)FlowElem_zcc:units = "m" ;
                FlowLinkFlowElem_yezc:longlayer_nametype = "Centerz" coordinate; of// netsee linkother (velocity point)." ;example for sigma
                FlowLinkFlowElem_yezc:unitsstandard_name = "m???" ;
        double FlowElem_bl(nFlowElem) ;
      FlowLink_ye:standard_name = "projection_y_coordinate" ;
        double FlowElem_zc(nFlowElem, nLayer)bl:units = "m" ;
                FlowElem_zcbl:long_name = "Vertical coordinates of layers underlying each FlowElement.bottom level" ;
                FlowElem_zcbl:unitsstandard_name = "m" sea_floor_depth" ; // wrt geoid, maar doen wij dat wel zo?
        double s1(time, nFlowElem) ;
                FlowElem_zc:layer_types1:coordinates = "zFlowElem_xcc FlowElem_ycc" ; // see other example for sigma
        double ucx(time, nFlowElem, nLayer) ;
                FlowElem_zc:standard_nameucx:coordinates = "???FlowElem_xcc FlowElem_ycc" ;
        double s1ucy(time, nFlowElem, nLayer) ;
                s1ucy:coordinates = "FlowCell_xc FlowCell_yc" ;FlowElem_xcc FlowElem_ycc FlowElem_zcc" ; // AvD: Mogen de z-coordinaten hier ook nog bij? (nFlowElem mapt naar x+y, nLayer naar z)

D-Flow FM map file with sigma coords (concept)

Code Block


netcdf test_map {
dimensions:
        double ucx(time, nFlowElem, nLayer)nNetNode = 706 ;
                ucx:coordinates = "FlowCell_xc FlowCell_yc" nNetLink = 1313 ;
        double ucy(time, nFlowElem, nLayer)nNetLinkPts = 2 ;
                ucy:coordinates = "FlowCell_xc FlowCell_yc" ; // AvD: Mogen de z-coordinaten hier ook nog bij? (nFlowElem mapt naar x+y, nLayer naar z)

UNSTRUC map file with sigma coords (concept)

Code Block


netcdf test_map {
dimensions:nFlowElem = 665 ;
        nFlowElemMaxNode = 6 ;
        nNetNodenFlowElemContourPts = 70699 ;
        nNetLinknFlowLink = 13131143 ;
        nNetLinkPtsnFlowLinkPts = 2 ;
        nFlowElemnLayer = 665 5;
        nFlowElemMaxNodetime = 6UNLIMITED ; // (1 currently)
variables:
        nFlowElemContourPts = 99 double FlowElem_bl(nFlowElem) ;
        nFlowLink        FlowElem_bl:units = 1143"m" ;
                nFlowLinkPtsFlowElem_bl:long_name = "bottom 2level" ;
        nLayer = 5;
        time = UNLIMITEDFlowElem_bl:standard_name = "sea_floor_depth" ; // (1 currently)
variables: wrt geoid, maar doen wij dat wel zo?
        double FlowElem_zc(nFlowElem, nLayer) ;
                FlowElem_zc:long_name = "Vertical coordinates of layers underlying each FlowElement." ;
                FlowElem_zc:units = "" ;
                FlowElem_zc:standard_name = "ocean_sigma_coordinate" ;
                FlowElem_zc:formula_terms = "sigma: FlowElem_zc eta: s1 depth: zbottom...FlowElem_bl" ; // mooie oplossing: zbottombottomlevel (en sigma/zc) mag tijdsonafhankelijk zijn
        double s1(time, nFlowElem) ;
                s1:coordinates = "FlowCellFlowElem_xcxcc FlowCellFlowElem_ycycc" ;
        double ucx(time, nFlowElem, nLayer) ;
                ucx:coordinates = "FlowCellFlowElem_xcxcc FlowCellFlowElem_ycycc" ;
// ...

UNSTRUC

D-Flow FM map file with subdomains for variable nr of layers (flexible layers, concept)

Code Block

netcdf test_map {
dimensions:
        nNetNode1 = 106 ;
        nNetLink1 = 313 ;
        nNetLinkPts1 = 2 ;
        nFlowElem1 = 165 ;
        nFlowElemMaxNode1 = 6 ;
        nFlowElemContourPts1 = 99 ;
        nFlowLink1 = 343 ;
        nFlowLinkPts1 = 2 ;
        nLayer1 = 5;
        nNetNode2 = 486 ;
        nNetLink2 = 673 ;
        nNetLinkPts2 = 2 ;
        nFlowElem2 = 578 ;
        nFlowElemMaxNode2 = 6 ;
        nFlowElemContourPts2 = 99 ;
        nFlowLink2 = 840 ;
        nFlowLinkPts2 = 2 ;
        nLayer2 = 10 ;
        // ... idem for 3 and 4
        nSubdomain = 4 ;
        nSubdomainLink = 3 ; // for example: 4 subdoms in one row
        nSubdomainLinkPts = 2 ;
        time = UNLIMITED ; // (1 currently)
variables:
        double NetNode_x_1(nNetNode1) ;
                NetNode_x_1:units = "m" ;
                NetNode_x_1:standard_name = "projection_x_coordinate" ;
                NetNode_x_1:long_name = "netnodal x-coordinate" ;
// ...
        double NetNode_x_2(nNetNode1) ;
                NetNode_x_2:units = "m" ;
                NetNode_x_2:standard_name = "projection_x_coordinate" ;
                NetNode_x_2:long_name = "netnodal x-coordinate" ;

        double s1_1(time, nFlowElem_1) ;
                s1_1:coordinates = "FlowCellFlowElem_xcxcc_1 FlowCellFlowElem_ycycc_1" ;
        double s1_2(time, nFlowElem_2) ;
                s1_2:coordinates = "FlowCellFlowElem_xcxcc_2 FlowCellFlowElem_ycycc_2" ;
// ...
        integer SubdomainLink (nSubdomainLink, nSubdomainLinkPts) ;
                SubdomainLink:long_name = "Meta link between subdomain numbers."
// .. randlinks tussen subdomains kunnen nuttig zijn, maar zijn ws niet nodig voor visualisatie?

        integer Subdomain ;
                Subdomain:interfaces = "SubdomainLink"

data:

 SubdomainLink =
  1, 2,
  2, 3,
  3, 4 ;

 Subdomain = 4; // weinig bijzonders.

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Versions Compared

Old Version 14

New Version Current

Key

Unstructured grid as a net

Examples

D-Flow FM net file with 2D cells on lon/lat-grid.

D-Flow FM map file with 2D cells on lon/lat-grid.

D-Flow FM map file with staggered solution variables (concept)

UNSTRUC map file with z-layers (concept)

D-Flow FM map file with z-layers (concept)

D-Flow FM map file with sigma coords (concept)

UNSTRUC map file with sigma coords (concept)

D-Flow FM map file with subdomains for variable nr of layers (flexible layers, concept)