The @turf/invariant package focuses on ensuring the integrity and validity of GeoJSON data. It provides functions for validating GeoJSON geometries, checking their types, and ensuring they conform to the GeoJSON specification. This package is crucial for developers who need to validate spatial data, enforce data quality, and prevent errors when working with geographic information.

The @turf/helpers package provides a collection of utility functions for creating and manipulating GeoJSON data. It includes functions for generating various GeoJSON geometries (points, lines, polygons), as well as helper methods for working with features and feature collections. This package is essential for developers who need lightweight, reusable functions to handle GeoJSON data without the overhead of a full geospatial library.

The @turf/meta package offers tools for working with collections of GeoJSON features. It provides functions for iterating over features, applying transformations, and extracting data from feature collections. This package is useful for developers who need to perform operations on multiple features at once, such as aggregating values, applying styles, or modifying geometries in bulk.

The @turf/turf package is a comprehensive geospatial library that includes a wide array of functions for spatial analysis, geometry manipulation, and geographic calculations. It provides tools for measuring distances, calculating areas, performing geometric operations (such as intersection and union), and much more. This package is ideal for developers who need a full-featured solution for complex geospatial tasks, all within a single, well-documented library.

The @turf/invariant package is dedicated to GeoJSON validation. It includes functions that check whether a given geometry or feature is valid according to the GeoJSON specification. This package helps developers ensure data integrity by providing tools to validate and normalize GeoJSON data before processing it.

The @turf/helpers package does not provide validation for GeoJSON data. Its primary focus is on creating and manipulating GeoJSON geometries and features. Developers are responsible for ensuring that the data they work with is valid GeoJSON.

The @turf/meta package does not focus on validation but rather on iterating and manipulating collections of GeoJSON features. It assumes that the input data is valid GeoJSON and provides tools for working with features and feature collections efficiently.

The @turf/turf package includes some validation features as part of its comprehensive geospatial toolkit. While it is not primarily a validation library, it provides functions that check the validity of geometries and features as part of its broader functionality.

The @turf/invariant package does not focus on feature creation. Its primary purpose is to validate and ensure the integrity of GeoJSON data. It does not provide functions for creating features but rather for checking and enforcing their validity.

The @turf/helpers package excels in feature creation, providing a variety of functions to generate GeoJSON geometries, features, and feature collections. It includes utilities for creating points, lines, polygons, and more, making it easy for developers to generate valid GeoJSON data programmatically.

The @turf/meta package is not designed for feature creation. It focuses on iterating over and manipulating existing GeoJSON features and collections. It provides tools for working with features but does not include utilities for generating new ones.

The @turf/turf package provides some feature creation capabilities as part of its extensive geospatial functionality. However, it is not its primary focus. The package is more comprehensive, offering a wide range of tools for analysis, manipulation, and geometric operations.

The @turf/invariant package does not include iteration functions. Its focus is on validating GeoJSON data rather than processing or iterating over features.

The @turf/helpers package does not provide specific functions for iterating over features. It focuses on feature creation and manipulation but does not include utilities for traversing or processing collections of features.

The @turf/meta package specializes in iterating over features. It provides functions for traversing GeoJSON feature collections, applying transformations, and performing operations on multiple features efficiently. This package is ideal for developers who need to work with collections of features and perform batch processing or aggregation.

The @turf/turf package includes some iteration capabilities as part of its geospatial toolkit. However, it is not specialized for iteration. The package provides functions that can operate on features and collections, but it does not focus exclusively on iterating over them.

Validating a GeoJSON Feature with @turf/invariant

import { isValid } from '@turf/invariant';
const myFeature = {
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [102.0, 0.5]
},
properties: {}
};
console.log(isValid(myFeature)); // true

Creating a Point Feature with @turf/helpers

import { point } from '@turf/helpers';
const myPoint = point([102.0, 0.5]);
console.log(myPoint);

Iterating Over Features with @turf/meta

import { featureEach } from '@turf/meta';
const featureCollection = {
type: 'FeatureCollection',
features: [
{ type: 'Feature', geometry: { type: 'Point', coordinates: [102.0, 0.5] }, properties: {} },
{ type: 'Feature', geometry: { type: 'Point', coordinates: [103.0, 1.0] }, properties: {} }
]
};
featureEach(featureCollection, (feature) => {
console.log(feature);
});

Calculating Distance with @turf/turf

import { distance } from '@turf/turf';
const point1 = [102.0, 0.5];
const point2 = [103.0, 1.0];
const dist = distance(point1, point2);
console.log(dist);