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Fatiando a Terra (Portuguese for Slicing the Earth) is an open-source Python toolkit for modeling and inversion in geophysics. It provides an easy and flexible way to perform and implement geophysical data analysis.

Official website and documentation: http://www.fatiando.org

Main changes to version 0.5: http://www.fatiando.org/changelog.html#version-0-5

doi: 10.5281/zenodo.157746

Fatiando a Terra (Portuguese for Slicing the Earth) is an open-source Python toolkit for modeling and inversion in geophysics. It provides an easy and flexible way to perform and implement geophysical data analysis.

Official website and documentation: http://www.fatiando.org

DOI for this release: http://dx.doi.org/10.5281/zenodo.49087

Main changes to version 0.4 (see http://www.fatiando.org/changelog.html#version-0-4 for a complete list):

• New module to obtain a synthetic convolutional seismogram in fatiando.seismic.conv. It can be given a depth model that will be converted to a time model before generating the synthetic seismogram.
• Refactor fatiando.inversion. Completely redesigned classes make implementing new inversions simpler. Subclassing Misfit is simpler, with fewer parameters necessary. The usage of existing inversions has changed little. A new dependency future was added to ease the transition to support Python 3.
• BUG FIX: Tesseroid computations failed (silently) when tesseroids were smaller than 1e-6 degrees on a side (~ 10 cm). Code now ignores these tesseroids on input and warns the user about it. If a tesseroid becomes smaller than this during adaptive discretization, the tesseroid effect will be computed without division. The user will be warned when this happens.
• New reduction to the pole and upward continuation with FFT in fatiando.gravmag.transform. The pole reduction allows both remanent and induced magnetization. Upward continuation is more stable and faster than the old space domain approach that was implemented.
• IMPORTANT BUG FIX: Fixed wrong ordering of nodes in fatiando.mesher.PointGrid. The order of nodes had the same problem as the regular grids. This was not caught before because PointGrid didn't use gridder.regular to generate its internal regular grid. This is an example of why reuse is a good thing! Tests now should catch any future problems.
• IMPORTANT BUG FIX: fatiando.gridder.regular and many other places in Fatiando where using the wrong convention for x, y dimensions. x should point North and y East. Thus, a data matrix (regular grid) should have x varying in the lines and y varying in the columns. This is oposite what we had. This fix also changes the shape argument to be (nx, ny) instead of (ny, nx). Users should be aware of this and double check their code.
• More stable derivatives in fatiando.gravamag.transform. The horizontal derivatives default to central finite-differences for greater stability. The FFT based derivatives use a grid padding to avoid edge effects. Thanks to Matteo Niccoli for suggesting this fix.
• Renamed fatiando.gravmag.fourier.ansig to fatiando.gravmag.transform.tga
• Remove fatiando.gravmag.fourier by moving relevant functions into fatiando.gravmag.transform.
• New seismic_wiggle and seismic_image plotting functions for seismic data in fatiando.vis.mpl
• Remove OpenMP parallelism from the fatiando.gravmag Cython coded forward modeling. Caused the majority of our install problems and didn't offer a great speed up anyway (< 2x). Can be replaced by multiprocessing parallelism without the install problems
• Tesseroid forward modeling functions in fatiando.gravmag.tesseroid take an optional pool argument. Use it to pass an open multiprocessing.Pool for the function to use. Useful to avoid processes spawning overhead when calling the forward modeling many times
• BUG FIX: Avoid weird numba error when tesseroid has zero volume. Let to better sanitizing the input model. Tesseroids with dimensions < 1cm are ignored because they have almost zero gravitational effect
• Ported the tesseroid forward modeling code from Cython to numba. This is following the discussion on issue #169 to make installing less of burden by removing the compilation step. The numba code runs just as fast. New functions support multiprocessing parallelism. Thanks to new contributor Graham Markall for help with numba.
• BUG FIX: Replace matplotlib.mlab.griddata with scipy.interpolate.griddata in fatiando.gridder.interp to avoid incompatibilities when using matplotlib > 1.3 (at least in MacOS). Nearest neighbor interpolation method flagged as nn was removed. Now it becomes only nearest. Also replace matplotlib with scipy in fatiando.mesher.PrismMesh.carvetopo
• New class fatiando.gravmag.basin2d.PolygonalBasinGravity for 2D gravity inversion for the relief of a basin.
• Removed package fatiando.gui. This was an experimental and temporary package to explore interactivity.
• Moved Moulder to the new module fatiando.gravmag.interactive. Completely rewrote the application. It now allows editing, moving, and deleting polygons, persisting the application to a pickle file and reloading, etc.

Fatiando a Terra (Portuguese for Slicing the Earth) is an open-source Python toolkit for modeling and inversion in geophysics. It provides an easy and flexible way to perform and implement geophysical data analysis.

Official website and documentation: http://www.fatiando.org

DOI for this release: http://dx.doi.org/10.5281/zenodo.16207

This is the first public release of the package.

Fatiando a Terra (Portuguese for Slicing the Earth) is an open-source Python toolkit for modeling and inversion in geophysics. It provides an easy and flexible way to perform and implement geophysical data analysis.

Official website and documentation: http://www.fatiando.org

DOI for this release: http://dx.doi.org/10.5281/zenodo.16205

Changes to version 0.3:

• New module fatiando.gravmag.normal_gravity
• BUG FIX: fatiando.gravmag.prism gravitational field functions now give correct results in all sides of the prism as well as inside.
• PEP8 compliance (started by @SamuelMarks)
• Cython implementations of fatiando.gravmag.sphere and fatiando.gravmag.polyprism.
• Multithreaded parallelism with OpenMP in fatiando.gravmag.sphere, fatiando.gravmag.polyprism and fatiando.gravmag.prism. Speedups are range from practically none to over 3x. Works automatically. Windows users will have to install an extra dependency! See the [install instructions](http://fatiando.readthedocs.org
• New class LCurve in fatiando.inversion.regularization for estimating the regularization parameter using an L-curve criterion.
• New module fatiando.gravmag.magdir for estimating the total magnetization vector of multiple sources.

Fatiando a Terra (Portuguese for Slicing the Earth) is an open-source Python toolkit for modeling and inversion in geophysics. It provides an easy and flexible way to perform and implement geophysical data analysis.

Official website and documentation: http://www.fatiando.org

DOI for this release: http://dx.doi.org/10.6084/m9.figshare.1115194

Changes to version 0.2:

• A complete re-implementation of fatiando.inversion and all modules that depended on it
• 300x speed-up of fatiando.seismic.ttime2d with new Cython code
• Various tweaks to fatiando.vis.myv
• New Euler deconvolution code for potential fields
• New gravity gradient tensor modeling with spheres in fatiando.gravmag.sphere (the first by @birocoles)
• Better support for random numbers
• New scalar wave 2D finite differences modeling in fatiando.seismic.wavefd (the first by @eusoubrasileiro)
• New more stable algorithms in fatiando.seismic.wavefd
• New function to load a grid in Surfer format. (first by @hbueno)
• New module fatiando.gravmag.eqlayer for equivalent layer processing of potential fields.