ppgrid sped up large-scale spatial interpolation by pre-indexing points per grid
This approach shows that pre-indexing spatial data to avoid multiplicative scaling in interpolation can unlock practical processing of continent-scale point datasets on modest hardware, enabling faster visualizations and iterative workflows.
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ppgrid speeds up continent-scale IDW interpolation by pre-indexing points
ppgrid is an open-source GIS tool that modifies the traditional Inverse Distance Weighting (IDW) interpolation by precalculating which points intersect which grid cells. This avoids the classical O(N*M) complexity of traversing every point for every grid cell. As a result, ppgrid achieves roughly 17x speed improvement over standard IDW implementations like gdal_grid or GRASS and can process 16 million points on a modest laptop where traditional tools fail.