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PyFVCOM: a collection of tools to interact with FVCOM
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README.md

Welcome to PyFVCOM!

Table of contents

Introduction

PyFVCOM is a collection of various tools and utilities which can be used to extract, analyse and plot input and output files from FVCOM as well as generate model inputs.

Installing

Easiest way is to install with pip/pip3:

pip install PyFVCOM

If you want to install the development version, checkout the `dev' branch and then from within the top-level directory:

pip install --user -e .

We are targeting Python 3.6+. PyFVCOM no longer supports Python 2.

We recommend Jupyter (formerly iPython) for interactive use of PyFVCOM (and python generally).

Provides

  • buoy - read data from an SQLite3 database of BODC buoy data.

    • Buoy - class to hold a range of time series data from buoys.
    • get_buoy_metadata
    • get_buoy_data
  • coordinate - convert from spherical and cartesian (UTM) coordinates. Also work with British National Grid coordinates and spherical.

    • utm_from_lonlat
    • lonlat_from_utm
    • british_national_grid_to_lonlat
    • lonlat_decimal_from_degminsec
    • lonlat_decimal_from_degminsec_wco
  • ctd - interrogate an SQLite data base of CTD casts.

    • CTD - class to hold a range of time series data from many different CTD formats we (PML) encounter.
    • get_CTD_metadata
    • get_CTD_data
    • get_ferrybox_data
  • current - tools related to processing currents

    • Residuals
    • scalar2vector
    • vector2scalar
    • residual_flow
    • progressive_vectors
    • vorticity
    • ebb_flood
    • principal_axis
  • grid - tools to parse SMS, DHI MIKE, GMSH and FVCOM unstructured grids. Also provides functionality to add coasts and clip triangulations to a given domain. Functions to parse FVCOM river files are also included, as is a function to resample an unstructured grid onto a regular grid (without interpolation, simply finding the nearest point within a threshold distance). This module contains a number of generally useful tools related to unstructured grids (node and element lookups, grid connectivity, grid metrics, area tools).

    • Domain - class to abstract loading different grid types away. The read_*_mesh methods below are now slighly redundant.
    • Domain.closest_node
    • Domain.closest_element
    • Domain.horizontal_transect_nodes
    • Domain.horizontal_transect_elements
    • Domain.calculate_areas
    • mp_interp_func
    • OpenBoundary - class to handle model open boundaries.
    • OpenBoundary.add_sponge_layer
    • OpenBoundary.add_tpxo_tides
    • OpenBoundary.add_nested_forcing
    • read_sms_mesh
    • read_fvcom_mesh
    • read_smesh_mesh
    • read_mike_mesh
    • read_gmsh_mesh
    • read_fvcom_obc
    • parse_obc_sections
    • read_sms_cst
    • write_sms_mesh
    • write_sms_bathy
    • write_mike_mesh
    • write_sms_cst
    • shp2cst
    • MIKEarc2cst
    • find_nearest_point
    • element_side_lengths
    • clip_triangulation
    • get_river_config
    • get_rivers
    • mesh2grid
    • line_sample
    • element_sample
    • connectivity
    • find_connected_nodes
    • find_connected_elements
    • get_area
    • find_bad_node
    • trigradient
    • rotate_points
    • get_boundary_polygons
    • get_attached_unique_nodes
    • grid_metrics
    • control_volumes
    • node_control_area
    • clockwise
    • element_control_area
    • unstructured_grid_volume
    • unstructured_grid_depths
    • elems2nodes
    • nodes2elems
    • vincenty_distance
    • haversine_distance
    • shape_coefficients
    • reduce_triangulation
    • getcrossectiontriangles
    • isintriangle
    • subset_domain
    • model_exterior
    • fvcom2ugrid
    • point_in_pixel
    • node_to_centre
    • Graph - class to hold an unstructured grid as a graph
    • ReducedFVCOMdist - class to query a grid graph for distance-based metrics
    • GraphFVCOMdepth - class to query a grid graph for depth-based metrics
  • interpolate - a class to handle interpolation between unstructured and regular grids.

    • mask_to_fvcom
    • mask_to_fvcom_meshgrid
    • MPIRegularInterpolateWorker
    • MPIRegularInterpolateWorker.InitialiseGrid
    • MPIRegularInterpolateWorker.InterpolateRegular
  • ocean - a number of routines to convert between combinations of temperature, salinity, pressure, depth and density.

    • pressure2depth
    • depth2pressure
    • dT_adiab_sw
    • theta_sw
    • cp_sw
    • sw_smow
    • sw_dens0
    • sw_seck
    • sw_dens
    • sw_svan
    • sw_sal78
    • dens_jackett
    • cond2salt
    • zbar
    • pea
    • simpsonhunter
    • mixedlayerdepth
    • stokes
    • dissipation
    • calculate_rhum
  • plot - plotting class for FVCOM outputs.

    • Depth - for plotting vertical slices
    • Depth.plot_slice
    • Time - for plotting timer series of data
    • Time.plot_line
    • Time.plot_scatter
    • Time.plot_quiver
    • Time.plot_surface
    • Plotter - for plotting horizontal maps
    • Plotter.plot_field
    • Plotter.plot_quiver
    • Plotter.plot_lines
    • Plotter.remove_line_plots
    • Plotter.plot_scatter
    • Plotter.plot_streamlines
    • CrossPlotter - for plotting cross-sections
    • CrossPlotter.cross_section_init
    • CrossPlotter.plot_pcolor_field
    • CrossPlotter.plot_quiver
    • MPIWorker - for plotting in parallel with MPI
    • MPIWorker.plot_field
    • MPIWorker.plot_streamlines
    • Player - for interactive animation of horizontal maps
    • plot_domain - to quickly plot a FileReader.
    • colourbar_extension
    • cm2inch
  • preproc - class for creating input files for FVCOM model runs.

    • Model - hold everything needed to generate new model inputs
    • Model.write_grid
    • Model.write_coriolis
    • Model.add_bed_roughness
    • Model.write_bed_roughness
    • Model.interp_sst_assimilation
    • Model.write_sstgrd
    • Model.interp_ady
    • Model.interp_ady_climatology
    • Model.write_adygrd
    • Model.add_sigma_coordinates
    • Model.sigma_generalized
    • Model.sigma_geometric
    • Model.sigma_tanh
    • Model.hybrid_sigma_coordinate
    • Model.write_sigma
    • Model.add_open_boundaries
    • Model.write_sponge
    • Model.add_grid_metrics
    • Model.write_tides
    • Model.add_rivers
    • Model.check_rivers
    • Model.write_river_forcing
    • Model.write_river_namelist
    • Model.read_nemo_rivers
    • Model.read_ea_river_temperature_climatology
    • Model.add_probes
    • Model.write_probes
    • Model.add_stations
    • Model.write_stations
    • Model.add_nests
    • Model.add_nests_harmonics
    • Model.add_nests_regular
    • Model.avg_nest_force_vel
    • Model.load_nested_forcing
    • Model.write_nested_forcing
    • Model.add_obc_types
    • Model.write_obc
    • Model.add_groundwater
    • Model.write_groundwater
    • Model.read_regular
    • Model.subset_existing_nest
    • Model.load_elevtide
    • Model.write_tsobc
    • NameListEntry - class for holding entries in a NameList class
    • NameListEntry.string
    • NameListEntry.tolist
    • NameList - class for creating FVCOM model namelists
    • NameList.index
    • NameList.value
    • NameList.update
    • NameList.update_nudging
    • NameList.update_nesting_interval
    • NameList.valid_nesting_timescale
    • NameList.update_ramp
    • NameList.write_model_namelist
    • write_model_namelist
    • Nest - class for holding nested OpenBoudnary objects
    • Nest.add_level
    • Nest.add_weights
    • Nest.add_tpxo_tides
    • Nest.add_nested_forcing
    • Nest.add_fvcom_tides
    • Nest.avg_nest_force_vel
    • WriteForcing - actually a fairly generic class to write netCDFs with a concise syntax
    • WriteForcing.add_variable
    • WriteForcing.write_fvcom_time
    • RegularReader - like PyFVCOM.read.FileReader, but for regularly gridded data
    • RegularReader.closest_element
    • RegularReader.closest_node
    • read_regular - load multiple regularly gridded files
    • HYCOMReader - like PyFVCOM.read.FileReader, but for HYCOM data
    • HYCOMReader.load_data
    • read_hycom - load multiple regularly gridded files
    • NEMOReader - like RegularReader, but specifically for NEMO outputs
    • NEMOReader.load
    • NemoRestartRegularReader
    • Regular2DReader
    • Restart - class to interact/modify FVCOM restart files
    • Restart.replace_variable
    • Restart.replace_variable_with_regular
    • Restart.write_restart
    • Restart.read_regular
  • read - parse the netCDF model output and extract a subset of the variables.

    • FileReader - read in FVCOM outputs
    • FileReader.add
    • FileReader.subtract
    • FileReader.multiply
    • FileReader.divide
    • FileReader.power
    • FileReader.load_data
    • FileReader.closest_time
    • FileReader.grid_volume
    • FileReader.total_volume_var
    • FileReader.avg_volume_var
    • FileReader.time_to_index
    • FileReader.time_average
    • `FileReader.add_river_flow
    • FileReader.to_excel
    • FileReader.to_csv
    • read_nesting_nodes
    • apply_mask
    • MFileReader - read in multiple FVCOM outputs
    • SubDomainReader - subset a model domain in space
    • SubDomainReader.add_evap_precip
    • SubDomainReader.add_river_data
    • SubDomainReader.aopen_integral
    • SubDomainReader.volume_integral
    • SubDomainReader.surface_integral
    • time_to_index
    • FileReaderFromDict - have a go at converting from ncread output to FileReader format
    • ncwrite
    • ncread - read netCDF data to a dictionary
    • read_probes
    • write_probes
    • WriteFVCOM - write a FileReader object to a netCDF file in FVCOM format
  • stats - some basic statistics tools.

    • calculate_regression
    • calculate_polyfit
    • rmse
    • calculate_coefficient
  • tidal_ellipse - Python version of the Tidal Ellipse MATLAB toolbox http://woodshole.er.usgs.gov/operations/sea-mat/tidal_ellipse-html/index.html.

    • ap2ep
    • ep2ap
    • cBEpm
    • get_BE
    • sub2ind
    • plot_ell
    • do_the_plot
    • prep_plot
  • tide - tools to use and abuse tidal data from an SQLite database of tidal time series.

    • HarmonicOutput
    • add_harmonic_results
    • get_observed_data
    • get_observed_metadata
    • clean_observed_data
    • parse_TAPPY_XML
    • get_harmonics
    • read_POLPRED
    • grid_POLPRED
    • get_harmonics_POLPRED
    • make_water_column
    • Lanczos - Lanczos time filter.
    • lanczos - As above, but not a class.
  • utilities - general utilities (including time utilities)

    • general.PassiveStore - our template class for lots of other classes
    • general.fix_range
    • general.ind2sub
    • general.flatten_list
    • general.split_string
    • general.ObjectFromDict
    • general.clean_html
    • general.cart2pol
    • general.pol2cart
    • time.julian_day
    • time.gregorian_date
    • time.overlap
    • time.common_time
    • time.make_signal
    • time.ramped_signal
  • validation - post-processing and validation utilities. Some of these are currently incomplete.

    • ValidationDB
    • ValidationDB.execute_sql
    • ValidationDB.create_table
    • ValidationDB.insert_into_table
    • ValidationDB.select_qry
    • ValidationDB.table_exists
    • ValidationDB.close_conn
    • dt_to_epochsec
    • epochsec_to_dt
    • plot_map
    • plot_tides
    • TideDB
    • TideDB.make_bodc_tables
    • TideDB.insert_tide_file
    • TideDB.get_tidal_series
    • TideDB.get_gauge_locations
    • TideDB.get_nearest_gauge_id
    • BODCAnnualTideFile
    • WCODB
    • WCODB.make_wco_tables
    • WCODB.insert_CTD_file
    • WCODB.insert_buoy_file
    • WCODB.insert_CTD_dir
    • WCODB.insert_csv_file
    • WCODB.get_observations
    • WCOParseFile
    • CSVFormatter
    • CompareData
    • CompareData.retrieve_file_data
    • CompareData.retrieve_obs_data
    • CompareData.get_comp_data_interpolated
    • CompareData.comp_data_nearest
    • CompareData.model_closest_time
    • CompareDataFileReader
    • CompareDataFileReader.retrieve_file_data
    • CompareDataFileReader.model_closest_time
    • CompareDataProbe
    • CompareDataProbe.retrieve_file_data
    • CompareICES
    • CompareICES.get_var_comp

Examples

The examples directory includes some Jupyter notebooks of some brief examples of how to use PyFVCOM. There are also sample scripts of those notebooks.

Quick oneliners:

Grid tools

  • Read an SMS unstructured grid: mesh = PyFVCOM.grid.Domain('mesh.2dm')
  • Read an FVCOM unstructured grid: mesh = PyFVCOM.grid.Domain('mesh.dat')
  • Find elements connected to node: elements = PyFVCOM.grid.find_connected_elements(n, mesh.grid.triangles)
  • Find nodes connected to node: nodes = PyFVCOM.grid.find_connected_nodes(n, mesh.grid.triangles)
  • Find model boundary from a grid: coast = PyFVCOM.grid.get_boundary_polygons(mesh.grid.triangles)
  • Calculate element areas: mesh.calculate_areas()
  • Calculate node control areas: node_control_area = [PyFVCOM.grid.node_control_area(n) for n in range(mesh.dims.node)]
  • Calculate element control areas: element_control_area = [PyFVCOM.grid.element_control_area(e, mesh.grid.triangles, area) for e in range(fvcom.dims.nele)]
  • Move a field from elements to nodes: on_nodes = elems2nodes(fvcom.data.field, mesh.grid.triangles)
  • Move a field from nodes to elements: on_elements = nodes2elems(fvcom.data.field, mesh.grid.triangles)

Model data

  • Read model output: fvcom = PyFVCOM.read.FileReader('casename_0001.nc', variables=['temp', 'salinity'])
  • Calculate density from temperature and salinity: density = PyFVCOM.ocean.dens_jackett(fvcom.data.temp, fvcom.data.salinity)

Miscellaneous tools

  • Make an array of datetime objects: times = PyFVCOM.utilities.time.date_range(start, end, inc=0.5)

Coding conventions

  • Use 4 spaces per indentation level
  • Never mix tabs and spaces
  • Imports should usually be on separate lines
  • from module import * is not OK; rather, use from module import name
  • Imports are always put at the top of the file
  • Avoid extraneous whitespace
  • Use parentheses sparingly
  • Don't put an if/for/while with a small body on a single line
  • Do not terminate your lines with semi-colons and do not use semi-colons to put two commands on the same line
  • If a class inherits from no other base classes, explicitly inherit from object. This also applies to nested classes.
  • Function names should be lowercase, underscore separated. Class names should be of the form `MyClass'.
  • Names of members considered private shall start with two underscores
  • Use lambda expressions only for one-liners (else: hard to read and to debug)
  • Use properties for accessing or setting data where you would normally have used simple, lightweight getter or setter methods
  • Use with when opening files or explicitly close files and sockets when done with them
  • Use TODO comments for code that is temporary, a short-term solution, or good-enough but not perfect
  • Verbose output should be off by default

Citation

Cazenave, P. W. et al. (2018). PyFVCOM (version x.x.x) [software]. Plymouth, Devon, United Kingdom: Plymouth Marine Laboratory. https://doi.org/10.5281/zenodo.1422462

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