View source for NetCDF synoptic data for multiple profiles

[[de:NetCDF Synoptische Daten auf Profilen]]

=Short Description=

Synoptic data for several profiles with different number of locations along each profile.

=Further Descriptions=
* [[NetCDF multiple profiles]]: coordinates and coordinate transformation for multiple profiles.
* [[NetCDF time coordinate]]: coordinate variable ''time''.
* [[NetCDF vertical coordinate]]: time and location dependent vertical coordinate.

=Version ''Discrete Sampling Geometry'' '''trajectoryProfile'''=

Data for multiple locations along one or several profiles (trajectories) are stored in a [[netCDF]] file in accordance with the concept of a ''Discrete Sampling Geometry'' with '''featureType=trajectoryProfile'''. An example (output from NCDUMP) for geometry as well as data is shown in  [[Media:P_synop_ncdump_2D.pdf|P_synop_ncdump_2D.pdf]].

This type of data is essentially identical with [[netCDF synoptic data at multiple locations]]. All relevant differences, which are the same for all geophysical variables, are explained for variable [[water level]].

float Mesh0_node_Wasserstand_2d(nMesh0_data_time, nMesh0_[[trajectory]], nMaxMesh0_[[trajectory]]_nodes) ;
: :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 area: mean" ;
: :comment = "ancillary variables may be used for visualization and data analysis as threshold and plot subgrid mask" ;
: :coordinates = "Mesh0_node_lon Mesh0_node_lat Mesh0_node_x Mesh0_node_y Mesh0_[[trajectory]]_long_name Mesh0_[[trajectory]]_node_distance" ;
: :grid_mapping = "Mesh0_crs" ;
: :standard_name = "sea_surface_height" ;

The following essential differences with respect to data defined for multiple locations exist:
# There are two instead of one (horizontal) dimensions: ''nMesh0_[[trajectory]]'' corresponds to the number of trajectories and ''nMaxMesh0_[[trajectory]]_nodes'' reflects the (maximum) number of locations for a [[trajectory]]. Using the two independent dimensions allows easy access to data along a single [[trajectory]].
# Auxiliary coordinate variable '''Mesh0_[[trajectory]]_node_distance''' is available. With this coordinate variable it is easy to display data along a [[trajectory]] in dependence on coordinate profile-meter.

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[[Overview]]