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geojson-vt

Slice GeoJSON data into vector tiles efficiently

  • 4.0.2
  • unpublished
  • latest
  • Source
  • npm
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1.3M
increased by12.74%
Maintainers
29
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Created

What is geojson-vt?

The geojson-vt package is a library for slicing GeoJSON into vector tiles on the fly. It's primarily designed to handle large amounts of data by cutting them into smaller, more manageable pieces called 'tiles'. These tiles can then be used for efficient rendering and manipulation on map interfaces.

What are geojson-vt's main functionalities?

Slicing GeoJSON into vector tiles

This feature allows you to convert a GeoJSON object into vector tiles. You can then retrieve specific tiles by their x, y, and z coordinates.

const geojsonVt = require('geojson-vt');
const geojsonData = {
  type: 'FeatureCollection',
  features: [...]
};
const options = {};
const tileIndex = geojsonVt(geojsonData, options);
const tile = tileIndex.getTile(z, x, y);

Custom tile generation options

This feature allows you to customize how the GeoJSON data is sliced into vector tiles, including the level of detail, simplification tolerance, and tile dimensions.

const options = {
  maxZoom: 17,  // max zoom to preserve detail on; can't be higher than 24
  tolerance: 3, // simplification tolerance (higher means simpler)
  extent: 4096, // tile extent (both width and height)
  buffer: 64,   // tile buffer on each side
  debug: 0,     // logging level (0 to disable, 1 or 2)
  lineMetrics: false, // whether to enable line metrics tracking for LineString/MultiLineString features
  promoteId: null,   // name of a feature property to promote to feature.id
  generateId: false, // whether to generate feature ids. Cannot be used with promoteId
  indexMaxZoom: 5,       // max zoom in the initial tile index
  indexMaxPoints: 100000 // max number of points per tile in the index
};
const tileIndex = geojsonVt(geojsonData, options);

On-the-fly tile generation

This feature allows you to generate tiles on demand, rather than processing an entire set of tiles upfront. This can be more efficient when dealing with large datasets.

const tile = tileIndex.getTile(z, x, y);
if (!tile) {
  console.log('Tile not found');
} else {
  console.log('Generated tile:', tile);
}

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Package last updated on 17 Jun 2024

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