pangeo-pyinterp
Python library for optimized geo-referenced interpolation.
About
The motivation of this project is to provide tools for interpolating geo-referenced data used in the field of geosciences. Other libraries cover this problem, but written entirely in Python, the performance of these projects was not quite sufficient for our needs. That is why this project started.
With this library, you can interpolate 2D, 3D, or 4D fields using n-variate and bicubic interpolators and unstructured grids. You can also apply for a data binning on the bivariate area by simple or linear binning.
The library core is written in C++ using the Boost C++ Libraries, Eigen3 and nanobind libraries.
This software also uses CMake to configure the project and Googletest to perform unit testing of the library kernel.
Fill undefined values
The undefined values in the grids do not allow interpolation of values located in the neighborhood. This behavior is a concern when you need to interpolate values near the mask of some fields. The library provides utilities to fill the undefined values:
fft_inpaint to fill all undefined values in a grid using the FFT Inpainting method.
loess to fill the undefined values on the boundary between the defined/undefined values using local regression.
gauss_seidel to fill all undefined values in a grid using the Gauss-Seidel method by relaxation.
multi_grid to fill all undefined values in a grid using the Multi-Grid method.
Geographic indexers
N-Dimensional Grids
N-dimensional grid is a grid defined by a matrix, in a 2D space, by a cube in a 3D space, etc. Each dimension of the grid is associated with a vector corresponding to its coordinates or axes. Axes used to locate a pixel in the grid from the coordinates of a point. These axes are either:
regular: a vector of 181 latitudes spaced a degree from -90 to 90 degrees;
irregular: a vector of 109 latitudes irregularly spaced from -90 to 89.940374 degrees.
These objects are manipulated by the class pyinterp.Axis, which will choose, according to Axis definition, the best implementation. This object will allow you to find the two indexes framing a given value. This operating mode allows better performance when searching for a regular axis (a simple calculation will enable you to see the index of a point immediately). In contrast, in the case of an irregular axis, the search will be performed using a binary search.
Finally, this class can define a circular axis from a vector to correctly locate a value on the circle. This type of Axis will is used for handling longitudes.
Temporal Axes
The pyinterp.TemporalAxis class handles temporal axes, i.e., axes defined by 64-bit integer vectors, which is the encoding used by numpy to control dates. This class allows you to process dates using integer arithmetic to ensure that no information is lost during calculations. These objects are used by spatiotemporal grids to perform temporal interpolations.
Unstructured Grids
In the case of unstructured grids, the index used is a R*Tree. These trees have better performance than the KDTree generally found in Python library implementations.
The tree used here is the implementation provided by the C++ Boost library.
An adaptation has been introduced to address spherical equatorial coordinates effectively. Although the Boost library allows these coordinates to manipulate natively, the performance is lower than in the case of Cartesian space. Thus, we have chosen to implement a conversion of Longitude Latitude Altitude (LLA) coordinates into Earth-Centered, Earth-Fixed (ECEF) coordinates transparently for the user to ensure that we can preserve excellent performance. The disadvantage of this implementation is that it requires fairly more memory, as one more element gets used to index the value of the Cartesian space.
The management of the LLA/ECEF coordinate conversion is managed to use the Vermeille, H. algorithm. It has an excellent performance with the accuracy of 1e-8 meters for altitude.
Geohash
Geohashing is a geocoding method used to encode geographic coordinates (latitude and longitude) into a short string of digits and letters delineating an area on a map, which is called a cell, with varying resolutions. The more characters in the string, the more precise the location.
Geohashes use Base-32 alphabet encoding (characters can be 0 to 9 and A to Z, excl A, I, L and O).
The geohash is a compact way of representing a location, and is useful for storing a location in a database, or for indexing a location in a database.
Geometry
This library provides Python bindings to Boost Geometry concepts and algorithms for both geographic and Cartesian coordinate spaces. The geometry module offers a comprehensive set of geometric primitives including points, linestrings, polygons, rings, segments, and bounding boxes. For each coordinate space (cartesian and geographic), dedicated algorithms are provided for common geometric operations such as:
Computing areas and perimeters of geometries
Calculating distances and azimuths between points
Determining centroids and closest points
Performing buffer and envelope operations
Converting between coordinate spaces
In the geographic space, additional features include support for multiple geodetic strategies (Andoyer, Karney, Thomas, Vincenty) for precise calculations on a spheroid, and coordinate transformations (LLA/ECEF, geographic to Cartesian conversions).
1 maintainer
Metadata
1 maintainer
Release files for pyinterp 2026.10.0
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