# @turf/interpolate > Creates an interpolated grid of points using the Inverse Distance Weighting method. Latest version **7.4.0** (published 2026-08-03) · MIT license · 0 weekly downloads ## Install ```sh npm install @turf/interpolate pnpm add @turf/interpolate yarn add @turf/interpolate bun add @turf/interpolate ``` ## Health **Score 80/100 (A)** — status: active. Positive: has types; esm support; no vulnerabilities; has provenance; recently updated; high maintenance score; high quality score; popular repo. Warnings: low downloads. ## Facts | | | |---|---| | Version | 7.4.0 | | Published | 2026-08-03 | | First published | 2017-08-02 | | Weekly downloads | 0 | | License | MIT | | TypeScript types | bundled | | Module format | ESM + CommonJS | | Dependencies | 13 | | Unpacked size | 31.3 KB | | Known vulnerabilities | 0 | | Install scripts | no | | Provenance | attested (GitHub Actions) | | GitHub stars | 10491 | | Author | Turf Authors | | Maintainers | rowanwins, tmcw, morganherlocker, tcql, mdfedderly, twelch, jamesmilneruk, morgan.herlocker | | Keywords | turf, idw, interpolate | ## Links - npm: https://www.npmjs.com/package/@turf/interpolate - Repository: https://github.com/Turfjs/turf - Issues: https://github.com/Turfjs/turf/issues - Funding: https://opencollective.com/turf - npm.io page: https://npm.io/package/@turf/interpolate ## Dependencies (13) - [tslib](https://npm.io/package/tslib.md) ^2.8.1 - [@turf/bbox](https://npm.io/package/@turf/bbox.md) 7.4.0 - [@turf/meta](https://npm.io/package/@turf/meta.md) 7.4.0 - [@turf/clone](https://npm.io/package/@turf/clone.md) 7.4.0 - [@turf/helpers](https://npm.io/package/@turf/helpers.md) 7.4.0 - [@turf/centroid](https://npm.io/package/@turf/centroid.md) 7.4.0 - [@turf/distance](https://npm.io/package/@turf/distance.md) 7.4.0 - [@turf/hex-grid](https://npm.io/package/@turf/hex-grid.md) 7.4.0 - [@types/geojson](https://npm.io/package/@types/geojson.md) ^7946.0.10 - [@turf/invariant](https://npm.io/package/@turf/invariant.md) 7.4.0 - [@turf/point-grid](https://npm.io/package/@turf/point-grid.md) 7.4.0 - [@turf/square-grid](https://npm.io/package/@turf/square-grid.md) 7.4.0 - [@turf/triangle-grid](https://npm.io/package/@turf/triangle-grid.md) 7.4.0 ## Alternatives - [@sindresorhus/slugify](https://npm.io/package/@sindresorhus/slugify.md) — 3.7M weekly downloads - [solid-js](https://npm.io/package/solid-js.md) — 2.7M weekly downloads - [expo-glass-effect](https://npm.io/package/expo-glass-effect.md) — 2.5M weekly downloads - [nanoassert](https://npm.io/package/nanoassert.md) — 780.8K weekly downloads - [@ffmpeg/ffmpeg](https://npm.io/package/@ffmpeg/ffmpeg.md) — 529.5K weekly downloads ## Recent versions - 7.4.0 (latest) — 2026-08-03 - 7.1.0-alpha.70 (prerelease) — 2024-08-09 - 7.3.5 — 2026-04-19 - 7.3.4 — 2026-02-08 - 7.3.3 — 2026-01-28 - 7.3.2 — 2026-01-14 - 7.3.1 — 2025-11-27 - 7.3.0 — 2025-11-17 - 7.2.0 — 2024-12-29 - 7.1.0 — 2024-08-09 - 7.1.0-alpha.7 — 2024-06-25 - 7.0.0 — 2024-06-07 - 7.0.0-alpha.116 — 2024-05-07 - 7.0.0-alpha.115 — 2024-04-23 - 7.0.0-alpha.114 — 2024-03-11 - … 24 more at https://npm.io/package/@turf/interpolate/versions ## README # @turf/interpolate ## interpolate Takes a set of points and estimates their 'property' values on a grid using the [Inverse Distance Weighting (IDW) method][1]. ### Parameters * `points` **[FeatureCollection][2]<[Point][3]>** with known value * `cellSize` **[number][4]** the distance across each grid point * `options` **[Object][5]** Optional parameters (optional, default `{}`) * `options.gridType` **[string][6]** defines the output format based on a Grid Type (options: 'square' | 'point' | 'hex' | 'triangle') (optional, default `'square'`) * `options.property` **[string][6]** the property name in `points` from which z-values will be pulled, zValue fallbacks to 3rd coordinate if no property exists. (optional, default `'elevation'`) * `options.units` **Units** used in calculating cellSize. Supports all valid Turf [Units][7]. (optional, default `'kilometers'`) * `options.weight` **[number][4]** exponent regulating the distance-decay weighting (optional, default `1`) * `options.bbox` **[BBox][8]** Bounding Box Array \[west, south, east, north] associated with the FeatureCollection. (optional, default `bbox(points)`) ### Examples ```javascript var points = turf.randomPoint(30, {bbox: [50, 30, 70, 50]}); // add a random property to each point turf.featureEach(points, function(point) { point.properties.solRad = Math.random() * 50; }); var options = {gridType: 'points', property: 'solRad', units: 'miles'}; var grid = turf.interpolate(points, 100, options); //addToMap var addToMap = [grid]; ``` Returns **[FeatureCollection][2]<([Point][3] | [Polygon][9])>** grid of points or polygons with interpolated 'property' [1]: https://en.wikipedia.org/wiki/Inverse_distance_weighting [2]: https://tools.ietf.org/html/rfc7946#section-3.3 [3]: https://tools.ietf.org/html/rfc7946#section-3.1.2 [4]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number [5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object [6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String [7]: https://turfjs.org/docs/api/types/Units [8]: https://tools.ietf.org/html/rfc7946#section-5 [9]: https://tools.ietf.org/html/rfc7946#section-3.1.6 --- This module is part of the [Turfjs project](https://turfjs.org/), an open source module collection dedicated to geographic algorithms. It is maintained in the [Turfjs/turf](https://github.com/Turfjs/turf) repository, where you can create PRs and issues. ### Installation Install this single module individually: ```sh $ npm install @turf/interpolate ``` Or install the all-encompassing @turf/turf module that includes all modules as functions: ```sh $ npm install @turf/turf ``` --- _Source: https://npm.io/package/@turf/interpolate · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._