# API Reference¶

## Interpolators¶

 Spline([mindist, damping, force_coords, engine]) Biharmonic spline interpolation using Green’s functions. VectorSpline2D([poisson, mindist, damping, …]) Elastically coupled interpolation of 2-component vector data. ScipyGridder([method, extra_args]) A scipy.interpolate based gridder for scalar Cartesian data.

## Data Processing¶

 BlockReduce(reduction, spacing[, region, …]) Apply a reduction/aggregation operation to the data in blocks/windows. BlockMean(spacing[, region, adjust, …]) Apply a (weighted) mean to the data in blocks/windows. Trend(degree) Fit a 2D polynomial trend to spatial data.

## Composite Estimators¶

 Chain(steps) Chain filtering operations to fit on each subsequent output. Vector(components) Fit an estimator to each component of multi-component vector data.

## Model Selection¶

 train_test_split(coordinates, data[, weights]) Split a dataset into a training and a testing set for cross-validation. cross_val_score(estimator, coordinates, data) Score an estimator/gridder using cross-validation.

## Coordinate Manipulation¶

 grid_coordinates(region[, shape, spacing, …]) Generate the coordinates for each point on a regular grid. scatter_points(region, size[, random_state]) Generate the coordinates for a random scatter of points. profile_coordinates(point1, point2, size[, …]) Coordinates for a profile along a line between two points. get_region(coordinates) Get the bounding region of the given coordinates. pad_region(region, pad) Extend the borders of a region by the given amount. project_region(region, projection) Calculate the bounding box of a region in projected coordinates. inside(coordinates, region[, out, tmp]) Determine which points fall inside a given region. block_split(coordinates, spacing[, adjust, …]) Split a region into blocks and label points according to where they fall.

## Utilities¶

 distance_mask(data_coordinates, maxdist[, …]) Mask grid points that are too far from the given data points. maxabs(*args) Calculate the maximum absolute value of the given array(s). variance_to_weights(variance[, tol, dtype]) Converts data variances to weights for gridding. test([doctest, verbose, coverage, figures]) Run the test suite.

## Datasets¶

 datasets.CheckerBoard([amplitude, region, …]) Generate synthetic data in a checkerboard pattern. datasets.fetch_baja_bathymetry() Fetch sample bathymetry data from Baja California. datasets.setup_baja_bathymetry_map(ax[, …]) Setup a Cartopy map for the Baja California bathymetry dataset. datasets.fetch_california_gps() Fetch sample GPS velocity data from California (the U.S. datasets.setup_california_gps_map(ax[, …]) Setup a Cartopy map for the California GPS velocity dataset. datasets.fetch_texas_wind() Fetch sample wind speed and air temperature data for the state of Texas, USA. datasets.setup_texas_wind_map(ax[, region, …]) Setup a Cartopy map for the Texas wind speed and air temperature dataset. datasets.fetch_rio_magnetic() Fetch sample total-field magnetic anomaly data from Rio de Janeiro, Brazil. datasets.setup_rio_magnetic_map(ax[, region]) Setup a Cartopy map for the Rio de Janeiro magnetic anomaly dataset.

## Base Classes¶

 base.BaseGridder Base class for gridders.