Question 1

How to install GEOSwift using Swift Package Manager?

Accepted Answer

Add the package dependency in your Package.swift with .package(url: "https://github.com/GEOSwift/GEOSwift.git", from: "11.2.0") and include "GEOSwift" in your target dependencies. Note that you might need to explicitly add the geos dependency in some cases, as per issue #195.

Question 2

GEOSwift vs Core Location for geometric operations?

Accepted Answer

GEOSwift is focused on advanced spatial analysis like intersections and unions, while Core Location is better for basic GPS and mapping features. Use GEOSwift when you need complex geometry processing beyond simple distance calculations.

Question 3

How to handle NaN values in GEOSwift coordinates?

Accepted Answer

Convert geometries to XY type using initialization like Geometry<XY>(geometry) to avoid NaN issues, as Z/M coordinates can be set to NaN during operations, and NaN != NaN in Swift can break equality checks.

Question 4

What are the licensing implications of using GEOSwift?

Accepted Answer

GEOSwift itself is MIT-licensed, but it depends on GEOS under LGPL 2.1, which may require dynamic linking or careful compliance, especially for static linking in commercial apps.

Question 5

How to migrate from GEOSwift version 4 to 5?

Accepted Answer

Check the VERSION_5.md file for details, as version 5 is a complete rewrite. You'll likely need to update your codebase for API changes and coordinate type handling.

Question 6

Does GEOSwift support 3D geometry operations?

Accepted Answer

Yes, it supports XYZ coordinates, but topological operations are primarily XY planar; Z coordinates are often preserved as user data and may not affect results, with potential NaN issues as noted in the README.

GEOSwift

What is GEOSwift?

Overview

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Pros & Cons

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Frequently Asked Questions