View source for NetCDF synoptic data at multiple locations

[[de:NetCDF Synoptische Daten an Einzelpositionen]]

=Short Description=

Synoptic data for multiple locations are described. A few examples for typical variables are shown.

=Additional Descriptions=

* [[NetCDF multiple locations]]: coordinates as well as coordinate transformation for multiple locations.
* [[NetCDF time coordinate]]: coordinate variable ''time''.
* [[NetCDF vertical coordinate]]: time and space dependent vertical coordinate variable.

=Version ''Discrete Sampling Geometry'' '''timeSeriesProfile'''=

Data for several individual locations are stored in a [[netCDF]] file in accordance with the concept of a ''Discrete Sampling Geometry'' with '''featureType=timeSeriesProfile'''. An example (output from NCDUMP) for geometry as well as data is shown in  [[Media:L_synop_ncdump_2D.pdf|L_synop_ncdump_2D.pdf]].

==Data without Z-Dependence==

[[Water level]] typically depends on time and location. But it is independent from the z-coordinate. [[Water level]] is therefore a good example for a geophysical variable without z-dependence.

float '''Mesh0_node_Wasserstand_2d'''(nMesh0_data_time, nMesh0_node) ;
: :long_name = "Wasserstand [ node ]" ;
: :units = "m" ;
: :name_id = 3 ;
: :_FillValue = 1.e+31f ;
: :ancillary_variables = "Mesh0_node_Gesamtwassertiefe_2d" ;
: :cell_measures = "area: Mesh0_node_Wasserflaeche_2d" ;
: :cell_methods = "nMesh0_data_time: point nMesh0_node: mean" ;
: :comment = "ancillary variables may be used ..." ;
: :coordinates = "Mesh0_node_lon Mesh0_node_lat Mesh0_node_x Mesh0_node_y Mesh0_node_long_name" ;
: :grid_mapping = "Mesh0_crs" ;
: :standard_name = "sea_surface_height" ;

Remarks:
# Invalid data may be present (see ''_FillValue'').
# Auxiliary variable (see ''ancillary_variables'') '''Mesh0_node_Gesamtwassertiefe_2d''' may be used during processing (data analysis and visualization) to neglect data for locations with very [[shallow water]].
# [[Water level]] is synoptic and (in our case) an area mean value (see ''cell_methods'').
# Variable '''Mesh0_node_Wasserflaeche_2d''' contains the relevant area for area mean values.
# Label coordinate variable '''Mesh0_node_long_name''' can be used for selection of locations (see ''coordinates'').

==Data with Z-Dependence==

Salinity typically depends on time, location and depth. In our case the z-coordinate reflects the center of water mass for the respective volume. Salinity is therefore a good example for a geophysical variable with z-dependence.

float Mesh0_node_Salzgehalt_2d(nMesh0_data_time, nMesh0_layer_2d, nMesh0_node) ;
: :long_name = "Salzgehalt [ node ]" ;
: :units = "1e-3" ;
: :name_id = 5 ;
: :_FillValue = 1.e+31f ;
: :ancillary_variables = "Mesh0_node_Gesamtwassertiefe_2d" ;
: :cell_measures = "volume: Mesh0_node_Wasservolumen_2d area: Mesh0_node_Wasserflaeche_2d" ;
: :cell_methods = "nMesh0_data_time: point nMesh0_layer_2d: mean nMesh0_node: mean" ;
: :comment = "ancillary variables may be used ..." ;
: :coordinates = "Mesh0_node_lon Mesh0_node_lat Mesh0_node_x Mesh0_node_y Mesh0_node_z_node_2d Mesh0_node_long_name" ;
: :grid_mapping = "Mesh0_crs" ;
: :standard_name = "sea_water_salinity" ;

Remarks:
# Invalid data may be present (see ''_FillValue'').
# Auxiliary variable (see ''ancillary_variables'') '''Mesh0_node_Gesamtwassertiefe_2d''' may be used during processing (data analysis and visualization) to neglect data for locations with very [[shallow water]].
# Salinity is synoptic and (in our case) an volume mean value (see ''cell_methods'').
# Variable '''Mesh0_node_Wasservolumen_2d''' contains the relevant volume for volume mean values.
# With additional help of '''Mesh0_node_Wasserflaeche_2d''' exact values for salt mass per area can be derived.
# Label coordinate variable '''Mesh0_node_long_name''' can be used for selection of locations (see ''coordinates'').

==Data for several Fractions==

[[Suspended sediment concentration]] typically depends on time, location and depth. Also different sediment fractions ''nMesh0_suspension_classes'' can be available. In our case the z-coordinate reflects the center of water mass for the respective volume. [[Suspended sediment concentration]] is therefore a good example for a geophysical variable with dependence on a label coordinate variable for one or more fractions.

float Mesh0_node_Schwebstoffgehalt_2d(nMesh0_data_time, nMesh0_suspension_classes, nMesh0_layer_2d, nMesh0_node) ;
: :long_name = "Schwebstoffgehalt [ node ]" ;
: :units = "kg m-3" ;
: :name_id = 7 ;
: :_FillValue = 1.e+31f ;
: :ancillary_variables = "Mesh0_node_Gesamtwassertiefe_2d" ;
: :cell_measures = "volume: Mesh0_node_Wasservolumen_2d area: Mesh0_node_Wasserflaeche_2d" ;
: :cell_methods = "nMesh0_data_time: point nMesh0_suspension_classes: point nMesh0_layer_2d: mean nMesh0_node: mean" ;
: :comment = "ancillary variables may be used ..." ;
: :coordinates = "Mesh0_node_lon Mesh0_node_lat Mesh0_node_x Mesh0_node_y Mesh0_node_z_node_2d Mesh0_node_long_name Mesh0_Schwebstoffklassen_2d" ;
: :grid_mapping = "Mesh0_crs" ;
: :standard_name = "concentration_of_suspended_matter_in_sea_water" ;

Remarks:
# Invalid data may be present (see ''_FillValue'').
# Auxiliary variable (see ''ancillary_variables'') '''Mesh0_node_Gesamtwassertiefe_2d''' may be used during processing (data analysis and visualization) to neglect data for locations with very [[shallow water]].
# [[Suspended sediment concentration]] is synoptic and (in our case) an volume mean value (see ''cell_methods'').
# Variable '''Mesh0_node_Wasservolumen_2d''' contains the relevant volume for volume mean values.
# With additional help of '''Mesh0_node_Wasserflaeche_2d''' exact values for suspended sediment mass per area can be derived.
# Label coordinate variable '''Mesh0_node_long_name''' can be used for selection of locations (see ''coordinates'').
# Label coordinate variable '''Mesh0_Schwebstoffklassen_2d''' can be used for selection of fractions (see ''coordinates'').

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