Draft of FFT Filter

Some minor edits

Update environment and requirements.
Style check

1. Rename function to isostatic_moho_airy
2. Test density array

This reverts commit 3e4d141.

Add new filter

commit 54c3cbe52bd33a94ccbb5bb44f2958bb3afc9330
Author: LL-Geo <[email protected]>
Date:   Thu Jun 23 21:36:23 2022 +0800

    Update filter

    Add more filter

commit 4a5d6f1
Author: Santiago Soler <[email protected]>
Date:   Thu Jun 16 18:00:32 2022 -0300

    Avoid checking floats in tesseroid doctests (fatiando#326)

    Remove expected results for tesseroid calculations in docstring examples.
    Printing floats in forward modelling examples isn't that meaningful and often
    creates failures when running doctests: small differences between the expected
    and the got value could occur under some dependency and OS combinations.

commit cc697af
Author: Matt Tankersley <[email protected]>
Date:   Fri Jun 17 08:24:32 2022 +1200

    Add progressbar to prism forward gravity calculations (fatiando#315)

    Add optional `progressbar` flag to `prism_gravity` function and to the
    `gravity` method of the prism layer accesor to print a progress bar using
    `numba_progress`. Add `numba_progress` as optional dependency. Add test
    functions for the new feature.

commit 5a1c895
Author: Santiago Soler <[email protected]>
Date:   Tue Jun 14 13:20:39 2022 -0300

    Specify spherical latitude in point sources guide (fatiando#325)

    Replaces latitude for spherical latitude in another place of the
    `point.rst`. Fix typo on "Alternatively".

commit cb476b2
Author: Federico Esteban <[email protected]>
Date:   Tue Jun 14 11:33:22 2022 -0300

    Note that spherical and geodetic latitudes are equal in spherical ellipsoids (fatiando#324)

    Add sentence in the Coordinate Systems section of the User Guide noting that
    if the reference ellipsoid were a sphere both the spherical latitude and the
    geodetic latitude are equivalent.

commit 1256ff6
Author: Federico Esteban <[email protected]>
Date:   Mon Jun 13 11:35:02 2022 -0300

    Add Federico Esteban to AUTHORS.md (fatiando#323)

    Add his name, link to his GitHub account, affiliation and ORCID number.

commit 32de6e0
Author: Federico Esteban <[email protected]>
Date:   Thu Jun 9 15:44:48 2022 -0300

    Specify "spherical latitude" when describing coordinates of point masses (fatiando#321)

    Add "spherical" when describing the spherical latitude coordinate of point
    masses in the user guide. This way we differentiate it from the "latitude"
    geodetic coordinate.

commit 9667fab
Author: Santiago Soler <[email protected]>
Date:   Mon Jun 6 11:05:17 2022 -0300

    Fix small format errors in the user guide (fatiando#319)

    Fix link to EquivalentSources.predict method and fix superscripts in the docs.

commit 2f7fcb6
Author: Santiago Soler <[email protected]>
Date:   Fri Jun 3 11:17:51 2022 -0300

    Update docs and create a proper user guide (fatiando#305)

    Update Sphinx docs using sphinx-panels.
    Add a proper User Guide that will ultimately replace the gallery examples.
    Each page of the new User Guide is a .rst file that uses jupyter-sphinx to run example code blocks.
    Added pages for: Coordinate systems, Forward Modelling, Gravity corrections and Equivalent Sources.
    Added a new doc/versions.rst file with links to previous documentations.

commit cf4080c
Author: Santiago Soler <[email protected]>
Date:   Tue May 31 15:58:25 2022 -0300

    Compute upward derivative of a grid in the frequency domain (fatiando#238)

    Define a new derivative_upward function for computing the spatial upward
    derivative of a 2D grid in the frequency domain. The function makes use of
    xrft for handling Fourier transformations of xarray objects. Add a new
    filters subpackage that includes FFT filters: functions that take grids in
    frequency domain and return the desired filter also in frequency domain. Add
    fft and ifft wrapper functions of the xrft.fft and xrft.ifft ones. Add
    a new apply_filter function that takes a grid in the spatial domain, applies
    fft, the filter and ifft and returns the filtered grid also in spatial domain.
    Add tests for the new features and a gallery example for the upward derivative.
    Add netcdf4 as requirement for testing.

commit 6a30797
Author: Santiago Soler <[email protected]>
Date:   Fri May 27 16:22:18 2022 -0300

    Ditch soon-to-be deprecated args of equivalent sources grid method (fatiando#311)

    The grid() method of Verde gridders now take a coordinates argument with
    the coordinates of the target grid. The previous region, shape and
    spacing arguments will be deprecated in Verde v2.0.0. This change makes it
    easier for our equivalent sources classes: we don't need the extra upward
    argument, users can create the coordinates of the target grid using
    verde.grid_coordinates and pass them via coordinates argument. Ditch the
    upward, shape, spacing and region arguments from the equivalent sources
    gridders. Replace them for the new coordinates argument: users need to
    provide the coordinates of the target grid instead of building it through the
    grid method. Raise errors if any of those old arguments are being passed. Raise
    warnings if any kwargs are passed: they are being ignored and not passed to the
    BaseGridder.grid() method.

commit 51ceb7e
Author: Agustina <[email protected]>
Date:   Mon May 23 11:03:54 2022 -0300

    Remove deprecated point_mass_gravity function (fatiando#310)

    Remove point_mass_gravity function from harmonica because it was deprecated on
    PR fatiando#280. Remove related test functions.

commit f336aa8
Author: Santiago Soler <[email protected]>
Date:   Thu May 5 14:52:08 2022 -0300

    Drop support for Python 3.6 (fatiando#309)

    Remove the compatibility metadata, remove from the CI matrix, bump the
    python_requires to 3.7+.

commit d132abb
Author: Santiago Soler <[email protected]>
Date:   Tue May 3 12:47:22 2022 -0300

    Add computation of gravitational tensor components for point sources (fatiando#288)

    Add new kernel functions to compute gravity tensor components generated by
    point sources. Add test functions for the new feature: check that the diagonal
    elements satisfy the Laplace equation, compare all components against finite
    difference computations from the gravity acceleration. Add test class for
    checking the symmetry of tensor components. Refactor old test functions for
    point gravity: merge some functions into single ones through pytest
    parametrizations. Avoid using "gradient" for specifying the gravity
    acceleration vector: the "gravity gradient" is usually used to refer to the
    tensor.

commit eb71d54
Author: Santiago Soler <[email protected]>
Date:   Fri Apr 22 17:23:00 2022 -0300

    Add deprecations to datasets and synthetic modules (fatiando#304)

    Add FutureWarnings to public functions of the synthetic and dataset
    modules. Add tests for the new warnings. Both modules will be deprecated in
    Harmonica v0.6.0. Instead of providing sample datasets, Harmonica will depend
    on Ensaio for that. The synthetic surveys depend on some of the sample
    datasets, but those functions are intended to be used in methodology articles,
    so they should live somewhere else.

commit a4598ef
Author: Santiago Soler <[email protected]>
Date:   Fri Apr 22 17:06:43 2022 -0300

    Add conversion of prisms or a prism layer to PyVista objects (fatiando#291)

    Add a new visualization module that hosts prism_to_pyvista: a function to
    convert a set of prisms into a pyvista.UnstructuredGrid. Include the new
    module and this function in the API Reference. Add a new to_pyvista() method
    to the PrismLayer accessor that converts a prism layer into a pyvista grid,
    making it easier to plot it in 3D. The UnstructuredGrid has the information
    about each prism as hexahedrons, along with their physical properties as cell
    data. Add tests for the new features. Add pyvista and vtk as optional
    dependencies to environment.yml and setup.cfg. Add a new example for
    plotting a PrismLayer. Configure Sphinx to show pyvista plots in the gallery
    and to use the pyvista-plot directive in docstrings.

commit 762d210
Author: Santiago Soler <[email protected]>
Date:   Mon Apr 4 14:09:45 2022 -0300

    Update Black to its stable version (fatiando#301)

    Black has released a stable version: 22.3.0. Now the style check tests use this
    version. Fixes a bug on CI in which Black was trying to import a private module
    of click that doesn't exist anymore. Rerun black: now Black hugs simple
    power operators.

commit 10577fa
Author: Santiago Soler <[email protected]>
Date:   Mon Apr 4 14:00:42 2022 -0300

    Update Sphinx version to 4.5.0 (fatiando#302)

    Updates also sphinx gallery and sphinx book theme.
    This fixes a issue between latest jinja2 and Sphinx 3.5.*.

commit f880065
Author: Leonardo Uieda <[email protected]>
Date:   Fri Mar 18 13:34:51 2022 +0000

    Move configuration from setup.py to setup.cfg (fatiando#296)

    Make the move away from setup.py following the recommendations from the
    Python packaging guides. Moves the requirement listing to setup.cfg as
    well and will use a script to extract this for conda installing on CI.

Update test for filter ( derivative_easting,
    derivative_northing, derivative_upward, upward_continuation)

fix pseudo gravity filter

update PG filter and kernel test

upload filter test file

Change docstrings

Co-authored-by: Santiago Soler <[email protected]>

correct docstrings

Co-authored-by: Santiago Soler <[email protected]>

correct docstrings

Co-authored-by: Santiago Soler <[email protected]>

Correct docstring

Co-authored-by: Santiago Soler <[email protected]>

Update docstring and add test for other filters

Update test file from netcdf4 to netcdf3

1. Add drop coordinate in test
2. change atol in high and low pass filter
2. Remove black space

Improve the math showed in the docstrings of the horizontal derivative
filters and the bandpass filters.

1. improve test for filter kernel (set test with numerical output, RTP test with old Fatiando package)
2. set back 0 wavenumber to 0
3. Reduce the code length for pseudo_gravity
4. update test for transformation

Increase rtol from 1e-6 to 2e-6

change height_displacement to positive
increase rtol for height_displacement = 1000

Move some portions of the RTP code into its own private function that
both the RTP filter and the pseudogravity filter can use. Refactor the
code to generate the filter to improve readability and make it a little
bit more optimal by predefining the cosines and sines. Define a private
function to check if the two angles for the magnetization are both None
or both angles but not one None and one angle.

Add test function that raises an error if only one of the magnetization
angles is None.

1. update f to ambient_field
2. update 149 to 1/gravitational constant
3. set 0 wavenumber to 0
4. add test for case magnetization is none

1. change expected value due to change 149.8 to 1/gravitational constant
2. update test for inclination = 90

Avoid repetition of the kernel line and reduce the if else to a single
if statement.

1. Change pseudo_gravity from cgs unit to SI unit
2. update test according to this change

Remove PG filter for future

remove pg

increase rtol from 1e-5 to 1.3e-5

The wavelength should have the inverse units of the frequencies
coordinates.