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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

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,
// ...

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 ;

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_xcc(nFlowElem) ;
                FlowElem_xcc:units = "m" ;
                FlowElem_xcc:standard_name = "projection_x_coordinate" ;
                FlowElem_xcc:long_name = "Flow element circumcenter x" ;
                FlowElem_xcc:bounds = "FlowElemContour_x" ;
        double FlowElem_ycc(nFlowElem) ;
                FlowElem_ycc:units = "m" ;
                FlowElem_ycc:standard_name = "projection_y_coordinate" ;
                FlowElem_ycc:long_name = "Flow element circumcenter y" ;
                FlowElem_ycc: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_xu(nFlowLink) ;
                FlowLink_xu:long_name = "Center coordinate of net link (velocity point)." ;
                FlowLink_xu:units = "m" ;
                FlowLink_xu:standard_name = "projection_x_coordinate" ;
        double FlowLink_yu(nFlowLink) ;
                FlowLink_yu:long_name = "Center coordinate of net link (velocity point)." ;
                FlowLink_yu:units = "m" ;
                FlowLink_yu:standard_name = "projection_y_coordinate" ;
        double s1(time, nFlowElem) ;
                s1:coordinates = "FlowElem_xcc FlowElem_ycc" ;
        double ucx(time, nFlowElem) ;
                ucx:coordinates = "FlowElem_xcc FlowElem_ycc" ;
        double ucy(time, nFlowElem) ;
                ucy:coordinates = "FlowElem_xcc FlowElem_ycc" ;
        double unorm(time, nFlowLink) ;
                unorm:standard_name = "normal_velocity" ;
                unorm:units = "m s-1" ;
                unorm:interfaces = "FlowLink" ;
                unorm:coordinates = "FlowLink_xu FlowLink_yu" ;

// 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_xcc = 1800.29010953126, 1827.13454757167, 1892.73565627098,
// ...
 FlowElemContour_x =
  1799.14001465, 1843.04504395, 1796.97290039, 1758.60998535, _, _, _, _, _,
    _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
    _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
    _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
    _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
// ...
 FlowLink =
  1, 2,
  2, 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 ;
        nFlowLinkPts = 2 ;
        nLayer = 5;
        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" ;
        double time(time) ;
                time:units = "seconds since 1992-08-31 00:00:00" ;
        double FlowElem_xcc(nFlowElem) ;
                FlowElem_xcc:units = "m" ;
                FlowElem_xcc:standard_name = "projection_x_coordinate" ;
                FlowElem_xcc:long_name = "Flow element circumcenter x" ;
                FlowElem_xcc:bounds = "FlowElemContour_x" ;
        double FlowElem_ycc(nFlowElem) ;
                FlowElem_ycc:units = "m" ;
                FlowElem_ycc:standard_name = "projection_y_coordinate" ;
                FlowElem_ycc:long_name = "Flow element circumcenter y" ;
                FlowElem_ycc: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"

...

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

...

location	top
type	list

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

Code Block

netcdf test_map { dimensions: nNetNode = 178907

nNetLink = 363472 ;

double FlowLink_xu(nFlowLink) ;
                FlowLink_xu:long_name

nNetLinkPts = 2

= "Center coordinate of net link (velocity point)." ;

nNetCell

=

184324

;

nNetCellMaxNode = 7

FlowLink_xu:units = "m" ;

nNetCellContourPts

=

99

;

nNetCellLink = 349141

FlowLink_xu:standard_name = "projection_x_coordinate" ;

nNetCellLinkPts = 2

double FlowLink_yu(nFlowLink) ;

time

=

UNLIMITED

;

//

(1 currently) variables: double NetNode_x(nNetNode)

 FlowLink_yu:long_name = "Center coordinate of net link (velocity point)." ;

NetNode

FlowLink_

x

yu:units = "

degrees_east

m" ;

NetNode

FlowLink_

x

yu:standard_name = "

longitude"

projection_y_coordinate" ;
        double FlowElem_zc(nFlowElem, nLayer) ;

NetNode

FlowElem_

x

zc:long_name = "

netnodal lon-coordinate" ; double NetNode_y(nNetNode)

Vertical coordinates of layers underlying each FlowElement." ;

NetNode

FlowElem_

y

zcc:units = "

degrees_north

m" ;

NetNode

FlowElem_

y

zc:

standard

layer_

name

type = "

latitude

z" ; // see other example for sigma

NetNode

FlowElem_

y

zc:

long

standard_name = "

netnodal lat-coordinate

???" ;
        double

NetNode

FlowElem_

z(nNetNode) ; int NetLink(nNetLink, nNetLinkPts

bl(nFlowElem) ;

NetLink:standard_name

FlowElem_bl:units = "

netlink

m" ;

NetLink

FlowElem_bl:long_name = "

link between two netnodes

bottom level" ;

byte

NetLinkType(nNetLink)

;

NetLinkType

FlowElem_bl:standard_name = "

netlink

sea_floor_

type

depth" ;

 // wrt geoid, maar doen wij dat wel zo?

NetLinkType:long_name

= "type of netlink"

double s1(time, nFlowElem) ;

NetLinkType

s1:

flag_values

coordinates =

0b, 1b

"FlowElem_xcc FlowElem_ycc" ;
        double ucx(time, nFlowElem, nLayer) ;

NetLinkType:flag_meanings

=

"First

type

of

netlink

      ucx:coordinates = "FlowElem_xcc FlowElem_ycc" ;
        double ucy(time, nFlowElem, nLayer) ;
                ucy:coordinates = "FlowElem_xcc

Second type of netlink

FlowElem_ycc FlowElem_zcc" ;

 // AvD: Mogen de z-coordinaten hier ook nog

double

bij?

time

time)

nFlowElem

;

mapt naar x+y, nLayer naar z)

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

Code Block
netcdf test_map { dimensions:

time:units

nNetNode =

"seconds since 2010-01-01 00:00:00"

706 ;

double NetCell_xc(nNetCell)

nNetLink = 1313 ;
        nNetLinkPts = 2 ;

NetCell_xc:units

   nFlowElem =

"degrees_east"

665 ;
        nFlowElemMaxNode = 6 ;

NetCell_xc:standard_name

   nFlowElemContourPts =

"longitude"

99 ;
        nFlowLink = 1143 ;

NetCell_xc:long_name

=

"Net

cell

nFlowLinkPts

circumcenter

x"

2 ;
        nLayer = 5;

NetCell_xc:bounds = "NetCellContour_x" ;

  time = UNLIMITED ; // (1 currently)
variables:
        double

NetCell

FlowElem_

yc

bl(

nNetCell

nFlowElem) ;

NetCell

FlowElem_

yc

bl:units = "

degrees_north

m" ;

NetCell

FlowElem_

yc

bl:

standard

long_name = "

latitude

bottom level" ;

NetCell

FlowElem_

yc

bl:

long

standard_name = "

Net cell circumcenter y

sea_floor_depth" ;

 // wrt geoid, maar doen

NetCell_yc:bounds = "NetCellContour_y" ;

wij dat wel zo?
        double

NetCellContour

FlowElem_

x

zc(

nNetCell

nFlowElem,

nNetCellContourPts

nLayer) ;

NetCellContour

FlowElem_

x

zc:

units

long_name = "

degrees_east

Vertical coordinates of layers underlying each FlowElement." ;

NetCellContour

FlowElem_

x

zc:

standard_name

units = "

longitude

" ;

NetCellContour

FlowElem_

x

zc:

long

standard_name =

"List of x-points forming netcell" ; double NetCellContour_y(nNetCell, nNetCellContourPts)

 "ocean_sigma_coordinate" ;

NetCellContour

FlowElem_

y

zc:

units

formula_terms = "

degrees_north

sigma: FlowElem_zc eta: s1 depth: FlowElem_bl" ;

 // mooie oplossing: bottomlevel (en sigma/zc) mag tijdsonafhankelijk zijn

NetCellContour_y:standard_name = "latitude"

double s1(time, nFlowElem) ;

NetCellContour_y:long_name

s1:coordinates = "

List of y-points forming netcell

FlowElem_xcc FlowElem_ycc" ;

int

double

NetCellNode(nNetCell

ucx(time, nFlowElem,

nNetCellMaxNode

nLayer) ;

NetCellNode

ucx:

standard_name

coordinates = "

netcell_node

FlowElem_xcc FlowElem_ycc" ;

NetCellNode:long_name = "Mapping from net cell to net nodes (first column is node count, will change)."

// ...

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

Code Block
netcdf test_map { dimensions: nNetNode1 = 106 ;

NetCellNode:netcell_coords = "NetCell_xc NetCell_yc"

nNetLink1 = 313 ;

int NetCellLink(nNetCellLink, nNetCellLinkPts)

nNetLinkPts1 = 2 ;

double s1(time, nNetCell)

nFlowElem1 = 165 ;
        nFlowElemMaxNode1 = 6 ;

s1:cell_methods

   nFlowElemContourPts1 =

"area: mean"

99 ;
        nFlowLink1 = 343 ;

s1:coordinates

   nFlowLinkPts1 =

"NetCell_xc Netcell_yc"

2 ;
        nLayer1 = 5;

s1:grid_mapping

  nNetNode2 =

"crs"

486 ;

double ucx(time, nNetCell)

nNetLink2 = 673 ;
        nNetLinkPts2 = 2 ;

ucx:cell_methods

  nFlowElem2 =

"area: point"

578 ;
        nFlowElemMaxNode2 = 6 ;

ucx:coordinates

 nFlowElemContourPts2 =

"NetCell_xc Netcell_yc"

99 ;
        nFlowLink2 = 840 ;

ucx:grid_mapping

nFlowLinkPts2 =

"crs"

2 ;

double ucy(time, nNetCell)

nLayer2 = 10 ;
        // ... idem for 3 and

ucy:cell_methods = "area: point" ;

4
        nSubdomain = 4 ;

ucy:coordinates

nSubdomainLink =

"NetCell_xc Netcell_yc"

3 ;

 // for example: 4 subdoms in one row

ucy:grid_mapping

nSubdomainLinkPts =

"crs"

2 ;
        time

int

crs

UNLIMITED ;

 // (1 currently)
variables:

crs:grid_mapping_name = "latitude_longitude"

double NetNode_x_1(nNetNode1) ;

crs:longitude

NetNode_

of_prime_meridian

x_1:units =

0.f

"m" ;

crs:semi_major_axis = 6378137.f

NetNode_x_1:standard_name = "projection_x_coordinate" ;

crs:inverse_flattening

NetNode_x_1:long_name =

298.2572f

"netnodal x-coordinate" ;

//

global attributes:

...

:institution = "Deltares"

double NetNode_x_2(nNetNode1) ;
                NetNode_x_2:

references

units = "

http://www.deltares.nl

m" ;

:source

NetNode_x_2:standard_name = "

UNSTRUC v1.0.11.10021:1007, model csmcourant

projection_x_coordinate" ;

:history

NetNode_x_2:long_name = "

Created on 2010-01-06T15:35:40+0100, UNSTRUC

netnodal x-coordinate" ;

        double

: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,

s1_1(time, nFlowElem_1) ;
                s1_1:coordinates = "FlowElem_xcc_1 FlowElem_ycc_1" ;
        double s1_2(time, nFlowElem_2) ;
                s1_2:coordinates = "FlowElem_xcc_2 FlowElem_ycc_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, _, _, _, _, _, _, _,

integer SubdomainLink (nSubdomainLink, nSubdomainLinkPts) ;
                SubdomainLink:long_name = "Meta link between subdomain numbers."
// ..

. 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 ;

 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.

Child pages

Versions Compared

Old Version 7

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)

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

Unstructured grid as a net

Examples

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

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

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