a5-layer.md

A5Layer

import {A5LayerDemo} from '@site/src/doc-demos/geo-layers';

The A5Layer renders filled and/or stroked polygons based on the A5 geospatial indexing system.

A5Layer is a CompositeLayer.

import Tabs from '@theme/Tabs'; import TabItem from '@theme/TabItem';

import {Deck} from '@deck.gl/core';
import {A5Layer} from '@deck.gl/geo-layers';

const layer = new A5Layer({
  id: 'A5Layer',
  data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/sf.bike.parking.a5.json',
  
  extruded: true,
  getPentagon: f => f.pentagon,
  getFillColor: f => {
    const value = f.count / 211;
    return [(1 - value) * 235, 255 - 85 * value, 255 - 170 * value];
  },
  getElevation: f => f.count,
  elevationScale: 10,
  pickable: true
});

new Deck({
  initialViewState: {
    longitude: -122.4,
    latitude: 37.74,
    zoom: 11
  },
  controller: true,
  getTooltip: ({object}) => object && `${object.pentagon} count: ${object.count}`,
  layers: [layer]
});

import {Deck, PickingInfo} from '@deck.gl/core';
import {A5Layer} from '@deck.gl/geo-layers';

type DataType = {
  pentagon: string;
  count: number;
};

const layer = new A5Layer<DataType>({
  id: 'A5Layer',
  data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/sf.bike.parking.a5.json',
  
  extruded: true,
  getPentagon: (f: DataType) => f.pentagon,
  getFillColor: (f: DataType) => {
    const value = f.count / 211;
    return [(1 - value) * 235, 255 - 85 * value, 255 - 170 * value];
  },
  getElevation: (f: DataType) => f.count,
  elevationScale: 10,
  pickable: true
});

new Deck({
  initialViewState: {
    longitude: -122.4,
    latitude: 37.74,
    zoom: 11
  },
  controller: true,
  getTooltip: ({object}: PickingInfo<DataType>) => object && `${object.pentagon} count: ${object.count}`,
  layers: [layer]
});

import React from 'react';
import {DeckGL} from '@deck.gl/react';
import {A5Layer} from '@deck.gl/geo-layers';
import type {PickingInfo} from '@deck.gl/core';

type DataType = {
  pentagon: string;
  count: number;
};

function App() {
  const layer = new A5Layer<DataType>({
    id: 'A5Layer',
    data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/sf.bike.parking.a5.json',
    
    extruded: true,
    getPentagon: (f: DataType) => f.pentagon,
    getFillColor: (f: DataType) => {
      const value = f.count / 211;
      return [(1 - value) * 235, 255 - 85 * value, 255 - 170 * value];
    },
    getElevation: (f: DataType) => f.count,
    elevationScale: 10,
    pickable: true
  });

  return <DeckGL
    initialViewState={{
      longitude: -122.4,
      latitude: 37.74,
      zoom: 11
    }}
    controller
    getTooltip={({object}: PickingInfo<DataType>) => object && `${object.pentagon} count: ${object.count}`}
    layers={[layer]}
  />;
}

Installation

To install the dependencies from NPM:

npm install deck.gl
# or
npm install @deck.gl/core @deck.gl/layers @deck.gl/geo-layers

import {A5Layer} from '@deck.gl/geo-layers';
import type {A5LayerProps} from '@deck.gl/geo-layers';

new A5Layer<DataT>(...props: A5LayerProps<DataT>[]);

To use pre-bundled scripts:

<script src="https://unpkg.com/deck.gl@^9.0.0/dist.min.js"></script>
<!-- or -->
<script src="https://unpkg.com/@deck.gl/core@^9.0.0/dist.min.js"></script>
<script src="https://unpkg.com/@deck.gl/layers@^9.0.0/dist.min.js"></script>
<script src="https://unpkg.com/@deck.gl/geo-layers@^9.0.0/dist.min.js"></script>

new deck.A5Layer({});

Properties

Inherits from all Base Layer, CompositeLayer, and PolygonLayer properties, plus the following:

Data Accessors

getPentagon (Accessor<bigint | string>, optional) {#getpentagon}

Called for each data object to retrieve the identifier of the A5 pentagon cell. May return one of the following:

• A 64-bit BigInt identifier for the A5 cell.
• A base-16 string encoding of the 64-bit integer

For more information on representing the A5 cell, see A5 Cell Representation

• default: object => object.pentagon

Sub Layers

The A5Layer renders the following sublayers:

• cell - a PolygonLayer rendering all A5 cells.

Source

modules/geo-layers/src/a5-layer