Lanczos Interpolation

Description

Perform interpolation using the Lanczos filter. This method uses a kernel-based approach to weigh contributions from nearby points, providing a balance between smoothing and sharpness.

Usage

import { lanczosInterpolation, PointIndexFast } from 'gis-tools-ts';
import type { VectorPoint } from 'gis-tools-ts';

// We have m-value data that we want to interpolate
interface TempData { temp: number; }

const pointIndex = new PointIndexFast<TempData>();
// add lots of points
pointIndex.insertLonLat(lon, lat, data);
// ....

// given a point we are interested in
const point: VectorPoint = { x: 20, y: -40 };
//  get a collection of points relative to the point
const data = await pointIndex.searchRadius(point.x, point.y, radius);

// interpolate
const interpolatedValue = lanczosInterpolation<TempData>(point, data, (p) => p.m.temp);
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