NetCDF Synoptische Daten im Dreiecksgitter

Kurze Beschreibung

Synoptische Daten für alle staggered data Positionen eines aus Dreiecken aufgebauten Gitters.

Weitere Beschreibungen

• NetCDF Dreiecksgitter: Koordinaten, Topologie und Koordinatentransformation.
• NetCDF Zeitkoordinate: Koordinatenvariable time.
• NetCDF Vertikalkoordinate: zeit- und ortsvariable Vertikalkoordinate.

Dimensionen

1. nMesh2_node : Anzahl der Knoten.
2. nMesh2_edge : Anzahl der Kanten.
3. nMesh2_poly : Anzahl der Polygone (hier Dreiecke).
4. nMesh2_class_names_strlen : max. Anzahl der Zeichen in Schwebstoffklassennamen.
5. nMesh2_time : Anzahl der Zeitpunkte (Gitterdatei).
6. nMesh2_data_time : UNLIMITED-Dimension, Anzahl der synoptischen Datensätze.
7. nMesh2_layer_2d : Anzahl der Schichten für tiefengemittelte Daten.
8. nMesh2_layer_3d : Anzahl der Schichten für tiefenstrukturierte Daten.
9. nMesh2_suspension_classes : Anzahl der Schwebstoffklassen, inklusive Summe aller Fraktionen.
10. two : Konstante ( = 2 ).
11. three : Konstante ( = 3 ).

Datenkompression

Auf Grund der Verwendung von z-Schichten sind über jeder Position in Abhängigkeit von der Wassertiefe unterschiedlich viele (aktive) Berechnungszellen vorhanden. Zur Reduktion der Größe der Ergebnisdatensätze könnten im Prinzip verschiedene Dimensionen in einer komprimierten Dimension zusammengefasst. Dauerhaft fehlende Daten würden dann erst gar nicht in der Datei abgespeichert. Dies reduzierte bei drei-dimensionalen Simulationen mit z-Schichten den Speicheraufwand typischer Weise um 60 bis 80 Prozent.

Komprimierte Daten an Knoten

Hinweise:

1. Methode kann nicht in CF-konformer Weise genutzt werden:
   • Probleme bei der Verwendung von "cell_methods: mean".
   • Probleme bei der Zuordnung der korrekten Koordinaten in Systemen wie ArcGIS.
2. Weitere allgemeine Hinweise, siehe unter NetCDF Kompression von Daten durch Aufsammeln.

Komprimierte Daten an Kanten

Siehe Hinweise unter Knoten.

Komprimierte Daten an Polygonen

Siehe Hinweise unter Knoten.

Gewichte

Gewichte werden insbesondere im Postprocessing benötigt, um abgeleitete Daten korrekt berechnen zu können, falls die hierfür relevanten Gewichtsfaktoren, nicht in einfacher Weise aus den Koordinaten abgeleitet werden können.

Längen

Durchflusshöhe an Positionen

Analog zu Einzelpositionen (Durchflusshöhe).

Durchflusshöhe an Positionen, differenziert nach Schichten

Analog zu Einzelpositionen (Durchflusshöhe, differenziert nach Schichten).

Informationen für das HN-Verfahren

Kennzeichnung offener und geschlossener Kanten

integer Mesh2_edge_type(nMesh2_edge) ;

Mesh2_edge_type:standard_name = "???" ; \\ yet to be defined

Mesh2_edge_type:long_name = "type of 2D mesh edges, closed or open" ;

Mesh2_edge_type:coordinates = "Mesh2_edge_lon Mesh2_edge_lat" ;

Mesh2_edge_type:_FillValue = fillvalue ;

Mesh2_edge_type:valid_range = 0, 1 ;

Mesh2_edge_type:valid_values = 0, 1 ;

Mesh2_edge_type:flag_meanings = "closed_edge, open_edge"

Mesh2_edge_type:grid_mapping = "crs" ;

Mesh2_edge_type:mesh = "mesh2" ;

Mesh2_edge_type:location = "edge"

Anmerkung: Mit Hilfe der von Deltares vorgeschlagenen Attribute mesh und location wird die Zugehörigkeit zu einem Gitter sowie zu einer (Daten-) Position innerhalb des Gitters beschrieben.

Kennzeichnung von Positionen für die Randwertsteuerung

Text fehlt noch.

Aktuelle (zeitvariable) Topografie

Es werden nur die Angaben für zeitvariable Topografie gemacht. Bei stationärer Topografie entfällt die Dimension time.

Knoten

Analog zu Durchflusshöhe an Knoten definieren, jedoch mit folgenden Änderungen in den Attributen:

Mesh2_node_depth:standard_name = "sea_floor_depth_below_geoid" ;

Mesh2_node_depth:long_name = "sea floor depth at 2D mesh nodes" ;

Mesh2_node_depth:units = "m" ;

Kanten

Analog zu Durchflussfläche über Kanten definieren, jedoch mit folgenden Änderungen in den Attributen:

Mesh2_edge_depth:standard_name = "sea_floor_depth_below_geoid" ;

Mesh2_edge_depth:long_name = "sea floor depth for 2D mesh edges" ;

Mesh2_edge_depth:units = "m" ;

Mesh2_edge_depth:cell_methods = "nMesh2_edge: mean" ;

Mesh2_edge_depth:cell_measures = "length: Mesh2_poly_max_length_2d" ;

Polygone

Analog zu Wasservolumen über Polygonen definieren, jedoch mit folgenden Änderungen in den Attributen:

Mesh2_poly_depth:standard_name = "sea_floor_depth_below_geoid" ;

Mesh2_poly_depth:long_name = "sea floor depth for 2D mesh polygons" ;

Mesh2_poly_depth:units = "m" ;

Mesh2_poly_depth:cell_methods = "nMesh2_poly: mean" ;

Mesh2_poly_depth:cell_measures = "area: Mesh2_poly_wet_area_2d" ;

Maximal zulässige Tiefe

• Vollständig analog zu Aktuelle Tiefe vorgehen, jedoch ohne Dimension time.
• Vorschlag für die Namensgebung:
  1. Knoten: "Mesh2_node_max_depth(nMesh2_node)" ;
  2. Kanten: "Mesh2_edge_max_depth(nMesh2_edge)" ;
  3. Polygone: "Mesh2_poly_max_depth(nMesh2_poly)" .

Wasserstand

Typischer Weise liegt der Wasserstand entweder (punktweise) am Knoten oder konstant im Polygon vor.

Knoten

Analog zu Durchflusshöhe an Knoten definieren, jedoch mit folgenden Änderungen in den Attributen:

Mesh2_node_water_level:standard_name = "sea_surface_height_above_geoid" ;

Mesh2_node_water_level:long_name = "water level for 2D mesh nodes" ;

Mesh2_node_water_level:units = "m" ;

Polygon

Analog zu Wasservolumen über Polygonen definieren, jedoch mit folgenden Änderungen in den Attributen:

Mesh2_poly_water_level:standard_name = "sea_surface_height_above_geoid" ;

Mesh2_poly_water_level:long_name = "water level for 2D mesh polygons" ;

Mesh2_poly_water_level:units = "m" ;

Mesh2_poly_water_level:cell_methods = "nMesh2_poly: mean"

Mesh2_poly_water_level:cell_measures = "area: Mesh2_poly_wet_area_2d" ;

Tiefengemittelter Salzgehalt

Typischer Weise liegt der Salzgehalt entweder (punktweise) über Knoten oder über Polygonen vor.

Knoten

Für zeit- und ortsvariable Vertikalkoordinate

double Mesh2_node_salinity_2d(time,nMesh2_layer_2d,nMesh2_node) ;

Mesh2_node_salinity_2d:standard_name = "sea_water_salinity" ;

Mesh2_node_salinity_2d:long_name = "salinity for 2D mesh nodes, depth averaged" ;

Mesh2_node_salinity_2d:units = "0.001" ;

Mesh2_node_salinity_2d:coordinates = "Mesh2_node_lon Mesh2_node_lat Mesh2_node_depth_zt_2d" ;

Mesh2_node_salinity_2d:_FillValue = fillvalue ;

Mesh2_node_salinity_2d:valid_range = valid minimum, valid maximum ;

Mesh2_node_salinity_2d:cell_methods = "nMesh2_layer_2d: mean" ;

Mesh2_node_salinity_2d:grid_mapping = "crs" ;

Mesh2_node_salinity_2d:mesh = "mesh2" ;

Mesh2_node_salinity_2d:location = "node"

Hinweis: Aktuelles Gewicht aus den Bounds der Hilfs-Vertikalkoordinate Mesh2_node_depth_zt_2d ermitteln.

Für Vertikalkoordinate mit Berechnungsformel

double Mesh2_node_salinity_2d(time,Mesh2_node_depth_2d,nMesh2_node) ;

Mesh2_node_salinity_2d:standard_name = "sea_water_salinity" ;

Mesh2_node_salinity_2d:long_name = "salinity for 2D mesh nodes, depth averaged" ;

Mesh2_node_salinity_2d:units = "0.001" ;

Mesh2_node_salinity_2d:coordinates = "Mesh2_node_lon Mesh2_node_lat" ;

Mesh2_node_salinity_2d:_FillValue = fillvalue ;

Mesh2_node_salinity_2d:valid_range = valid minimum, valid maximum ;

Mesh2_node_salinity_2d:cell_methods = "Mesh2_node_depth_2d: mean" ;

Mesh2_node_salinity_2d:cell_measures = "length: Mesh2_node_water_depth_2d" ;

Mesh2_node_salinity_2d:grid_mapping = "crs" ;

Mesh2_node_salinity_2d:mesh = "mesh2" ;

Mesh2_node_salinity_2d:location = "node"

Polygone

Für zeit- und ortsvariable Vertikalkoordinate

double Mesh2_poly_salinity_2d(time,nMesh2_layer_2d,nMesh2_poly) ;

Mesh2_poly_salinity_2d:standard_name = "sea_water_salinity" ;

Mesh2_poly_salinity_2d:long_name = "salinity for 2D mesh polygons, depth averaged" ;

Mesh2_poly_salinity_2d:units = "0.001" ;

Mesh2_poly_salinity_2d:coordinates = "Mesh2_poly_lon Mesh2_poly_lat Mesh2_poly_depth_zt_2d" ;

Mesh2_poly_salinity_2d:_FillValue = fillvalue ;

Mesh2_poly_salinity_2d:valid_range = valid minimum, valid maximum ;

Mesh2_poly_salinity_2d:cell_methods = "nMesh2_layer_2d: nMesh2_poly: mean" ;

Mesh2_poly_salinity_2d:cell_measures = "volume: Mesh2_poly_water_volume_2d" ;

Mesh2_poly_salinity_2d:grid_mapping = "crs" ;

Mesh2_poly_salinity_2d:mesh = "mesh2" ;

Mesh2_poly_salinity_2d:location = "poly"

Für Vertikalkoordinate mit Berechnungsformel

double Mesh2_poly_salinity_2d(time,Mesh2_poly_depth_2d,nMesh2_poly) ;

Mesh2_poly_salinity_2d:standard_name = "sea_water_salinity" ;

Mesh2_poly_salinity_2d:long_name = "salinity for 2D mesh polygons, depth averaged" ;

Mesh2_poly_salinity_2d:units = "0.001" ;

Mesh2_poly_salinity_2d:coordinates = "Mesh2_poly_lon Mesh2_poly_lat" ;

Mesh2_poly_salinity_2d:_FillValue = fillvalue ;

Mesh2_poly_salinity_2d:valid_range = valid minimum, valid maximum ;

Mesh2_poly_salinity_2d:cell_methods = "Mesh2_poly_depth_2d: nMesh2_poly: mean" ;

Mesh2_poly_salinity_2d:cell_measures = "volume: Mesh2_poly_water_volume_2d" ;

Mesh2_poly_salinity_2d:grid_mapping = "crs" ;

Mesh2_poly_salinity_2d:mesh = "mesh2" ;

Mesh2_poly_salinity_2d:location = "poly"

Tiefenstrukturierter Salzgehalt

Typischer Weise liegt der Salzgehalt entweder (punktweise) über Knoten oder über Polygonen vor.

Knoten

Für zeit- und ortsvariable Vertikalkoordinate

double Mesh2_node_salinity_3d(time,nMesh2_vedge) ; \\ compression used

double Mesh2_node_salinity_3d(time,nMesh2_layer_3d,nMesh2_node) ; \\ uncompressed definition

Mesh2_node_salinity_3d:standard_name = "sea_water_salinity" ;

Mesh2_node_salinity_3d:long_name = "salinity for 2D mesh nodes, vertically structured" ;

Mesh2_node_salinity_3d:units = "0.001" ;

Mesh2_node_salinity_3d:coordinates = "Mesh2_node_lon Mesh2_node_lat Mesh2_node_depth_zt_3d" ;

Mesh2_node_salinity_3d:_FillValue = fillvalue ;

Mesh2_node_salinity_3d:valid_range = valid minimum, valid maximum ;

Mesh2_node_salinity_3d:cell_methods = "nMesh2_layer_3d: mean" ;

Mesh2_node_salinity_3d:grid_mapping = "crs" ;

Mesh2_node_salinity_2d:mesh = "mesh2" ;

Mesh2_node_salinity_2d:location = "node"

Hinweis: Aktuelles Gewicht aus den Bounds der Hilfs-Vertikalkoordinate Mesh2_node_depth_zt_3d ermitteln

Bemerkung:

• Was muss in cell_methods korrekt verwendet werden, um über eine Schicht gemittelte Daten zu bezeichnen? Beziehen sich die Angaben auf die Dimensionen der dekomprimierten Variablen, was eigentlich logisch wäre?

Für Vertikalkoordinate mit Berechnungsformel

double Mesh2_node_salinity_3d(time,nMesh2_vedge) ; \\ compression used

double Mesh2_node_salinity_3d(time,Mesh2_node_depth_3d,nMesh2_node) ; \\ uncompressed definition

Mesh2_node_salinity_3d:standard_name = "sea_water_salinity" ;

Mesh2_node_salinity_3d:long_name = "salinity for 2D mesh nodes, vertically structured" ;

Mesh2_node_salinity_3d:units = "0.001" ;

Mesh2_node_salinity_3d:coordinates = "Mesh2_node_lon Mesh2_node_lat Mesh2_node_depth_3d" ;

Mesh2_node_salinity_3d:_FillValue = fillvalue ;

Mesh2_node_salinity_3d:valid_range = valid minimum, valid maximum ;

Mesh2_node_salinity_3d:cell_methods = "Mesh2_node_depth_3d: mean" ;

Mesh2_node_salinity_3d:cell_measures = "length: Mesh2_node_water_depth_3d" ;

Mesh2_node_salinity_3d:grid_mapping = "crs" ;

Mesh2_node_salinity_2d:mesh = "mesh2" ;

Mesh2_node_salinity_2d:location = "node"

Bemerkung:

• Was muss in cell_methods korrekt verwendet werden, um über eine Schicht gemittelte Daten zu bezeichnen? Beziehen sich die Angaben auf die Dimensionen der dekomprimierten Variablen, was eigentlich logisch wäre?

Polygone

Für zeit- und ortsvariable Vertikalkoordinate

double Mesh2_poly_salinity_3d(time,nMesh2_cell) ; \\ compression used

double Mesh2_poly_salinity_3d(time,nMesh2_layer_3d,nMesh2_poly) ; \\ uncompressed definition

Mesh2_poly_salinity_3d:standard_name = "sea_water_salinity" ;

Mesh2_poly_salinity_3d:long_name = "salinity for 2D mesh polygons, vertically structured" ;

Mesh2_poly_salinity_3d:units = "0.001" ;

Mesh2_poly_salinity_3d:coordinates = "Mesh2_poly_lon Mesh2_poly_lat Mesh2_poly_depth_zt_3d" ;

Mesh2_poly_salinity_3d:_FillValue = fillvalue ;

Mesh2_poly_salinity_3d:valid_range = valid minimum, valid maximum ;

Mesh2_poly_salinity_3d:cell_methods = "nMesh2_layer_3d: nMesh2_poly: mean" ;

Mesh2_poly_salinity_3d:cell_measures = "volume: Mesh2_poly_water_volume_3d" ;

Mesh2_poly_salinity_3d:grid_mapping = "crs" ;

Mesh2_poly_salinity_3d:mesh = "mesh2" ;

Mesh2_poly_salinity_3d:location = "poly"

Für Vertikalkoordinate mit Berechnungsformel

double Mesh2_poly_salinity_3d(time,nMesh2_cell) ; \\ compression used

double Mesh2_poly_salinity_3d(time,Mesh2_poly_depth_3d,nMesh2_poly) ; \\ uncompressed definition

Mesh2_poly_salinity_3d:standard_name = "sea_water_salinity" ;

Mesh2_poly_salinity_3d:long_name = "salinity for 2D mesh polygons, vertically structured" ;

Mesh2_poly_salinity_3d:units = "0.001" ;

Mesh2_poly_salinity_3d:coordinates = "Mesh2_poly_lon Mesh2_poly_lat Mesh2_poly_depth_3d" ;

Mesh2_poly_salinity_3d:_FillValue = fillvalue ;

Mesh2_poly_salinity_3d:valid_range = valid minimum, valid maximum ;

Mesh2_poly_salinity_3d:cell_methods = "Mesh2_poly_depth_3d: nMesh2_poly: mean" ;

Mesh2_poly_salinity_3d:cell_measures = "volume: Mesh2_poly_water_volume_3d" ;

Mesh2_poly_salinity_3d:grid_mapping = "crs" ;

Mesh2_poly_salinity_3d:mesh = "mesh2" ;

Mesh2_poly_salinity_3d:location = "poly"

Tiefengemittelte Strömungsgeschwindigkeit

Knoten

Analog zu tiefengemittelter Salzgehalt definieren, jedoch mit folgenden Änderungen in den Attributen:

Mesh2_node_velocity_x_2d:standard_name = "sea_water_x_velocity" ; \\ or better eastward_sea_water_velocity

Mesh2_node_velocity_x_2d:long_name = "current velocity in x-direction for 2D mesh nodes, depth averaged" ;

Mesh2_node_velocity_x_2d:units = "m s-1" ;

Bemerkung: y-Komponente sea_water_y_velocity (northward_sea_water_velocity) analog.

Kanten

Für zeit- und ortsvariable Vertikalkoordinate

double Mesh2_edge_velocity_x_2d(time,nMesh2_layer_2d,nMesh2_edge) ;

Mesh2_edge_velocity_x_2d:standard_name = "sea_water_x_velocity" ; \\ or better eastward_sea_water_velocity

Mesh2_edge_velocity_x_2d:long_name = "current velocity in x-direction for 2D mesh edges, depth averaged" ;

Mesh2_edge_velocity_x_2d:units = "m s-1" ;

Mesh2_edge_velocity_x_2d:coordinates = "Mesh2_edge_lon Mesh2_edge_lat Mesh2_edge_depth_zt_2d" ;

Mesh2_edge_velocity_x_2d:_FillValue = fillvalue ;

Mesh2_edge_velocity_x_2d:valid_range = valid minimum, valid maximum ;

Mesh2_edge_velocity_x_2d:cell_methods = "nMesh2_layer_2d: nMesh2_edge: mean" ;

Mesh2_edge_velocity_x_2d:cell_measures = "area: Mesh2_edge_flow_area_2d" ;

Mesh2_edge_velocity_x_2d:grid_mapping = "crs"

Mesh2_edge_velocity_x_2d:mesh = "mesh2" ;

Mesh2_edge_velocity_x_2d:location = "edge"

Bemerkung: y-Komponente sea_water_y_velocity (northward_sea_water_velocity) analog.

double Mesh2_edge_velocity_n_2d(time,nMesh2_layer_2d,nMesh2_edge) ;

Mesh2_edge_velocity_n_2d:standard_name = "???" ;

Mesh2_edge_velocity_n_2d:long_name = "normal current velocity for 2D mesh edges, depth averaged" ;

Mesh2_edge_velocity_n_2d:units = "m s-1" ;

Mesh2_edge_velocity_n_2d:coordinates = "Mesh2_edge_lon Mesh2_edge_lat Mesh2_edge_depth_zt_2d" ;

Mesh2_edge_velocity_n_2d:_FillValue = fillvalue ;

Mesh2_edge_velocity_n_2d:valid_range = valid minimum, valid maximum ;

Mesh2_edge_velocity_n_2d:cell_methods = "nMesh2_layer_2d: nMesh2_edge: mean" ;

Mesh2_edge_velocity_n_2d:cell_measures = "area: Mesh2_edge_flow_area_2d" ;

Mesh2_edge_velocity_n_2d:grid_mapping = "crs"

Mesh2_edge_velocity_n_2d:mesh = "mesh2" ;

Mesh2_edge_velocity_n_2d:location = "edge"

Für Vertikalkoordinate mit Berechnungsformel

double Mesh2_edge_velocity_x_2d(time,Mesh2_edge_depth_2d,nMesh2_edge) ;

Mesh2_edge_velocity_x_2d:standard_name = "sea_water_x_velocity" ; \\ or better eastward_sea_water_velocity

Mesh2_edge_velocity_x_2d:long_name = "current velocity in x-direction for 2D mesh edges, depth averaged" ;

Mesh2_edge_velocity_x_2d:units = "m s-1" ;

Mesh2_edge_velocity_x_2d:coordinates = "Mesh2_edge_lon Mesh2_edge_lat" ;

Mesh2_edge_velocity_x_2d:_FillValue = fillvalue ;

Mesh2_edge_velocity_x_2d:valid_range = valid minimum, valid maximum ;

Mesh2_edge_velocity_x_2d:cell_methods = "Mesh2_edge_depth_2d: nMesh2_edge: mean" ;

Mesh2_edge_velocity_x_2d:cell_measures = "area: Mesh2_edge_flow_area_2d" ;

Mesh2_edge_velocity_x_2d:grid_mapping = "crs"

Mesh2_edge_velocity_x_2d:mesh = "mesh2" ;

Mesh2_edge_velocity_x_2d:location = "edge"

Bemerkung: y-Komponente sea_water_y_velocity (northward_sea_water_velocity) analog.

double Mesh2_edge_velocity_n_2d(time,Mesh2_edge_depth_2d,nMesh2_edge) ;

Mesh2_edge_velocity_n_2d:standard_name = "???" ;

Mesh2_edge_velocity_n_2d:long_name = "normal current velocity for 2D mesh edges, depth averaged" ;

Mesh2_edge_velocity_n_2d:units = "m s-1" ;

Mesh2_edge_velocity_n_2d:coordinates = "Mesh2_edge_lon Mesh2_edge_lat" ;

Mesh2_edge_velocity_n_2d:_FillValue = fillvalue ;

Mesh2_edge_velocity_n_2d:valid_range = valid minimum, valid maximum ;

Mesh2_edge_velocity_n_2d:cell_methods = "Mesh2_edge_depth_2d: nMesh2_edge: mean" ;

Mesh2_edge_velocity_n_2d:cell_measures = "area: Mesh2_edge_flow_area_2d" ;

Mesh2_edge_velocity_n_2d:grid_mapping = "crs"

Mesh2_edge_velocity_n_2d:mesh = "mesh2" ;

Mesh2_edge_velocity_n_2d:location = "edge"

Tiefenstrukturierte Strömungsgeschwindigkeit

Knoten

Analog zu tiefenstrukturierter Salzgehalt definieren, jedoch mit folgenden Änderungen in den Attributen:

Mesh2_node_velocity_x_3d:standard_name = "sea_water_x_velocity" ; \\ or better eastward_sea_water_velocity

Mesh2_node_velocity_x_3d:long_name = "current velocity in x-direction for 2D mesh nodes, vertically structured" ;

Mesh2_node_velocity_x_3d:units = "m s-1" ;

Bemerkung: y-Komponente sea_water_y_velocity (northward_sea_water_velocity) analog.

Kanten

Für zeit- und ortsvariable Vertikalkoordinate

double Mesh2_edge_velocity_x_3d(time,nMesh2_face) ; \\ compression used

double Mesh2_edge_velocity_x_3d(time,nMesh2_layer_3d,nMesh2_edge) ; \\ uncompressed definition

Mesh2_edge_velocity_x_3d:standard_name = "sea_water_x_velocity" ; \\ or better eastward_sea_water_velocity

Mesh2_edge_velocity_x_3d:long_name = "current velocity in x-direction for 2D mesh edges, vertically structured" ;

Mesh2_edge_velocity_x_3d:units = "m s-1" ;

Mesh2_edge_velocity_x_3d:coordinates = "Mesh2_edge_lon Mesh2_edge_lat Mesh2_edge_depth_zt_3d" ;

Mesh2_edge_velocity_x_3d:_FillValue = fillvalue ;

Mesh2_edge_velocity_x_3d:valid_range = valid minimum, valid maximum ;

Mesh2_edge_velocity_x_3d:cell_methods = "nMesh2_layer_3d: nMesh2_edge: mean" ;

Mesh2_edge_velocity_x_3d:cell_measures = "area: Mesh2_edge_flow_area_3d" ;

Mesh2_edge_velocity_x_3d:grid_mapping = "crs"

Mesh2_edge_velocity_x_3d:mesh = "mesh2" ;

Mesh2_edge_velocity_x_3d:location = "edge"

Bemerkung: y-Komponente sea_water_y_velocity (northward_sea_water_velocity) analog.

double Mesh2_edge_velocity_z_3d(time,nMesh2_face) ; \\ compression used

double Mesh2_edge_velocity_z_3d(time,nMesh2_layer_3d,nMesh2_edge) ; \\ uncompressed definition

Mesh2_edge_velocity_z_3d:standard_name = "upward_sea_water_velocity" ;

Mesh2_edge_velocity_z_3d:long_name = "current velocity in z-direction for 2D mesh nodes, vertically structured" ;

Mesh2_edge_velocity_z_3d:units = "m s-1" ;

Mesh2_edge_velocity_z_3d:coordinates = "Mesh2_edge_lon Mesh2_edge_lat Mesh2_edge_depth_zt_3d" ;

Mesh2_edge_velocity_z_3d:_FillValue = fillvalue ;

Mesh2_edge_velocity_z_3d:valid_range = valid minimum, valid maximum ;

Mesh2_edge_velocity_z_3d:cell_methods = "nMesh2_layer_3d: nMesh2_edge: mean" ;

Mesh2_edge_velocity_z_3d:cell_measures = "area: Mesh2_edge_flow_area_3d" ;

Mesh2_edge_velocity_z_3d:grid_mapping = "crs"

Mesh2_edge_velocity_z_3d:mesh = "mesh2" ;

Mesh2_edge_velocity_z_3d:location = "edge"

double Mesh2_edge_velocity_n_3d(time,nMesh2_face) ; \\ compression used

double Mesh2_edge_velocity_n_3d(time,nMesh2_layer_3d,nMesh2_edge) ; \\ uncompressed definition

Mesh2_edge_velocity_n_3d:standard_name = "???" ;

Mesh2_edge_velocity_n_3d:long_name = "normal current velocity for 2D mesh edges, vertically structured" ;

Mesh2_edge_velocity_n_3d:units = "m s-1" ;

Mesh2_edge_velocity_n_3d:coordinates = "Mesh2_edge_lon mesh2_edge_lat Mesh2_edge_depth_zt_3d" ;

Mesh2_edge_velocity_n_3d:_FillValue = fillvalue ;

Mesh2_edge_velocity_n_3d:valid_range = valid minimum, valid maximum ;

Mesh2_edge_velocity_n_3d:cell_methods = "nMesh2_layer_3d: nMesh2_edge: mean" ;

Mesh2_edge_velocity_n_3d:cell_measures = "length: Mesh2_edge_flow_area_3d" ;

Mesh2_edge_velocity_n_3d:grid_mapping = "crs"

Mesh2_edge_velocity_n_3d:mesh = "mesh2" ;

Mesh2_edge_velocity_n_3d:location = "edge"

Für Vertikalkoordinate mit Berechnungsformel

double Mesh2_edge_velocity_x_3d(time,nMesh2_face) ; \\ compression used

double Mesh2_edge_velocity_x_3d(time,Mesh2_edge_depth_3d,nMesh2_edge) ; \\ uncompressed definition

Mesh2_edge_velocity_x_3d:standard_name = "sea_water_x_velocity" ; \\ or better eastward_sea_water_velocity

Mesh2_edge_velocity_x_3d:long_name = "current velocity in x-direction for 2D mesh edges, vertically structured" ;

Mesh2_edge_velocity_x_3d:units = "m s-1" ;

Mesh2_edge_velocity_x_3d:coordinates = "Mesh2_edge_lon Mesh2_edge_lat Mesh2_edge_depth_3d" ;

Mesh2_edge_velocity_x_3d:_FillValue = fillvalue ;

Mesh2_edge_velocity_x_3d:valid_range = valid minimum, valid maximum ;

Mesh2_edge_velocity_x_3d:cell_methods = "Mesh2_edge_depth_3d: nMesh2_edge: mean" ;

Mesh2_edge_velocity_x_3d:cell_measures = "area: Mesh2_edge_flow_area_3d" ;

Mesh2_edge_velocity_x_3d:grid_mapping = "crs"

Mesh2_edge_velocity_x_3d:mesh = "mesh2" ;

Mesh2_edge_velocity_x_3d:location = "edge"

Bemerkung: y-Komponente sea_water_y_velocity (northward_sea_water_velocity) analog.

double Mesh2_edge_velocity_z_3d(time,nMesh2_face) ; \\ compression used

double Mesh2_edge_velocity_z_3d(time,Mesh2_edge_depth_3d,nMesh2_edge) ; \\ uncompressed definition

Mesh2_edge_velocity_z_3d:standard_name = "upward_sea_water_velocity" ;

Mesh2_edge_velocity_z_3d:long_name = "current velocity in z-direction for 2D mesh nodes, vertically structured" ;

Mesh2_edge_velocity_z_3d:units = "m s-1" ;

Mesh2_edge_velocity_z_3d:coordinates = "Mesh2_edge_lon Mesh2_edge_lat Mesh2_edge_depth_3d" ;

Mesh2_edge_velocity_z_3d:_FillValue = fillvalue ;

Mesh2_edge_velocity_z_3d:valid_range = valid minimum, valid maximum ;

Mesh2_edge_velocity_z_3d:cell_methods = "Mesh2_edge_depth_3d: nMesh2_edge: mean" ;

Mesh2_edge_velocity_z_3d:cell_measures = "area: Mesh2_edge_flow_area_3d" ;

Mesh2_edge_velocity_z_3d:grid_mapping = "crs"

Mesh2_edge_velocity_z_3d:mesh = "mesh2" ;

Mesh2_edge_velocity_z_3d:location = "edge"

double Mesh2_edge_velocity_n_3d(time,nMesh2_face) ; \\ compression used

double Mesh2_edge_velocity_n_3d(time,Mesh2_edge_depth_3d,nMesh2_edge) ; \\ uncompressed definition

Mesh2_edge_velocity_n_3d:standard_name = "???" ;

Mesh2_edge_velocity_n_3d:long_name = "normal current velocity for 2D mesh edges, vertically structured" ;

Mesh2_edge_velocity_n_3d:units = "m s-1" ;

Mesh2_edge_velocity_n_3d:coordinates = "Mesh2_edge_lon mesh2_edge_lat Mesh2_edge_depth_3d" ;

Mesh2_edge_velocity_n_3d:_FillValue = fillvalue ;

Mesh2_edge_velocity_n_3d:valid_range = valid minimum, valid maximum ;

Mesh2_edge_velocity_n_3d:cell_methods = "Mesh2_edge_depth_3d: nMesh2_edge: mean" ;

Mesh2_edge_velocity_n_3d:cell_measures = "length: Mesh2_edge_flow_area_3d" ;

Mesh2_edge_velocity_n_3d:grid_mapping = "crs"

Mesh2_edge_velocity_n_3d:mesh = "mesh2" ;

Mesh2_edge_velocity_n_3d:location = "edge"

Anmerkungen, Fragen

• Datei nutzt Deltares-CF-Erweiterungen.
• Datei ist nicht vollständig CF-konform. Für das Attribut cell_measures müsste length als Wert zugelassen werden.
• Dasselbe gilt im Prinzip für depth. Allerdings ist depth ein CF Standardname, und dann könnte dieser Wert doch gemäß Abschnitt 7.3.4 in der CF-Metadaten Konvention zulässig sein.

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