Changelog¶

Version 1.2.0¶

Released on: 2019/07/23

Bug fixes:

Return the correct coordinates when passing pixel_register=True and shape to verde.grid_coordinates. The returned coordinates had 1 too few elements in each dimension (and the wrong values). This is because we generate grid-line registered points first and then shift them to the center of the pixels and drop the last point. This only works when specifying spacing because it will generate the right amount of points. When shape is given, we need to first convert it to “grid-line” shape (with 1 extra point per dimension) before generating coordinates. (#183)
Reset force coordinates when refitting splines. Previously, the splines set the force coordinates from the data coordinates only the first time fit was called. This means that when fitting on different data, the spline would still use the old coordinates leading to a poor prediction score. Now, the spline will use the coordinates of the current data passed to fit. This only affects cases where force_coords=None. It’s a slight change and only affects some of the scores for cross-validation. (#191)

New functions/classes:

New class verde.SplineCV: a cross-validated version of Spline . that performs grid search cross-validation to automatically tune the parameters of a Spline. (#185)
New function verde.longitude_continuity to format longitudes to a continuous range so that they can be indexed with verde.inside (#181)
New function verde.load_surfer to load grid data from a Surfer ASCII file (a contouring, griding and surface mapping software from GoldenSoftware). (#169)
New function verde.median_distance that calculates the median near neighbor distance between each point in the given dataset. (#163)

Improvements:

Allow verde.block_split and verde.BlockReduce to take a shape argument instead of spacing. Useful when the size of the block is less meaningful than the number of blocks. (#184)
Allow zero degree polynomials in verde.Trend, which represents a mean value. (#162)
Function verde.cross_val_score returns a numpy array instead of a list for easier computations on the results. (#160)
Function verde.maxabs now handles inputs with NaNs automatically. (#158)

Documentation:

New tutorial to explain the intricacies of grid coordinates generation, adjusting spacing vs region, pixel registration, etc. (#192)

Maintenance:

Drop support for Python 3.5. (#178)
Add support for Python 3.7. (#150)
More functions are now part of the base API: n_1d_arrays, check_fit_input and least_squares are now included in verde.base. (#156)

This release contains contributions from:

Released on: 2018/11/06

New features:

New verde.grid_to_table function that converts grids to xyz tables with the coordinate and data values for each grid point (#148)
Add an extra_coords option to coordinate generators (grid_coordinates, scatter_points, and profile_coordinates) to specify a constant value to be used as an extra coordinate (#145)
Allow gridders to pass extra keyword arguments (**kwargs) for the coordinate generator functions (#144)

Improvements:

Don’t use the Jacobian matrix for predictions to avoid memory overloads. Use dedicated and numba wrapped functions instead. As a consequence, predictions are also a bit faster when numba is installed (#149)
Set the default n_splits=5 when using KFold from scikit-learn (#143)

Bug fixes:

Use the xarray grid’s pcolormesh method instead of matplotlib to plot grids in the examples. The xarray method takes care of shifting the pixels by half a spacing when grids are not pixel registered (#151)

New contributors to the project:

Released on: 2018/10/10

Paper submission to JOSS (#134). This is the new default citation for Verde.
Remove default shape for the grid method (#140). There is no reason to have one and it wasn’t even implemented in grid_coordinates.
Fix typo in the weights tutorial (#136).

Released on: 2018/09/13

First release of Verde. Establishes the gridder API and includes blocked reductions, bi-harmonic splines [Sandwell1987], coupled 2D interpolation [SandwellWessel2016], chaining operations to form a pipeline, and more.