@types/d3-geo

What is @types/d3-geo?

The @types/d3-geo package contains TypeScript type definitions for d3-geo, a JavaScript library that provides geographical projections, transformations, and path generators. It enables developers to work with geographic data using D3.js, ensuring type safety and autocompletion in TypeScript projects.

What are @types/d3-geo's main functionalities?

Geographic Projections

This feature allows you to create various geographic projections to map spherical coordinates to a flat surface. The code sample demonstrates how to create an Albers projection and a path generator for rendering.

import * as d3 from 'd3-geo';

const projection = d3.geoAlbers();
const pathGenerator = d3.geoPath().projection(projection);
const pathData = pathGenerator({ type: 'Sphere' });

Spherical Shapes

This feature enables the creation of spherical shapes such as circles on the globe. The code sample shows how to create a geoCircle with a specified center and radius, and generate the path data for rendering.

import * as d3 from 'd3-geo';

const circle = d3.geoCircle().center([0, 0]).radius(90);
const circlePathData = d3.geoPath()(circle());

Geographic Transformations

This feature provides transformations such as rotations to manipulate geographic coordinates. The code sample illustrates how to rotate a point on the globe.

import * as d3 from 'd3-geo';

const rotate = d3.geoRotation([90, -45]);
const rotatedCoordinates = rotate([0, 0]);

GeoJSON Feature Rendering

This feature allows rendering of GeoJSON objects using D3's path generator. The code sample demonstrates how to generate path data for a GeoJSON feature.

import * as d3 from 'd3-geo';
import { Feature } from 'geojson';

const pathGenerator = d3.geoPath();
const feature: Feature = {
  type: 'Feature',
  geometry: {
    type: 'Point',
    coordinates: [0, 0]
  }
};
const pathData = pathGenerator(feature);

Other packages similar to @types/d3-geo

topojson

TopoJSON is an extension of GeoJSON that encodes topology. It offers functionality to encode geographic data structures in a more efficient format than GeoJSON. Unlike @types/d3-geo, which provides type definitions for D3's geographic functionalities, TopoJSON focuses on the data format itself.

leaflet

Leaflet is a leading open-source JavaScript library for mobile-friendly interactive maps. It is designed with simplicity, performance, and usability in mind. While @types/d3-geo provides type definitions for D3's geographic functions, Leaflet offers a full-fledged mapping solution with a wide range of features including tile layers, markers, popups, and more.

proj4

Proj4js is a JavaScript library to transform point coordinates from one coordinate system to another, including datum transformations. It is similar to @types/d3-geo in that it deals with geographic projections, but it is a standalone library for coordinate transformation rather than type definitions for D3's geographic functions.

README

Installation

npm install --save @types/d3-geo

Summary

This package contains type definitions for d3-geo (https://github.com/d3/d3-geo/).

Details

Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/d3-geo/v1.

Additional Details

• Last updated: Tue, 07 Nov 2023 15:11:37 GMT
• Dependencies: @types/geojson

Credits

These definitions were written by Hugues Stefanski, Tom Wanzek, Alex Ford, Boris Yankov, and Nathan Bierema.