NGeoKDBush 1.0.1

.NET Standard 2.0
NuGet\Install-Package NGeoKDBush -Version 1.0.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
dotnet add package NGeoKDBush --version 1.0.1
<PackageReference Include="NGeoKDBush" Version="1.0.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add NGeoKDBush --version 1.0.1
#r "nuget: NGeoKDBush, 1.0.1"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install NGeoKDBush as a Cake Addin
#addin nuget:?package=NGeoKDBush&version=1.0.1

// Install NGeoKDBush as a Cake Tool
#tool nuget:?package=NGeoKDBush&version=1.0.1


This library allows indexing geographical points, and then querying for all points of interest that are some distance from some location. The points will be returned ordered by being closet to furthest.

It implements fast nearest neighbors queries for locations on Earth, taking Earth curvature and date line wrapping into account. Direct port of geokdbush which itself was inspired by sphere-knn, but uses a different algorithm.

A geographic extension for nkdbush.


var index = new KDBush<City>(cities.ToArray(), p => p.Lon, p => p.Lat);
var geoKdBush = new GeoKDBush<City>();
var nearest = geoKdBush.Around(index, -119.7051, 34.4363, 5);


Around(IKDBush<T> index, double lng, double lat, int? maxResults = null, double? maxDistance = null, Predicate<T> predicate = null)

Returns an array of the closest points from a given location in order of increasing distance.

  • index: nkdbush index.
  • lng: query point longitude.
  • lat: query point latitude.
  • maxResults: (optional) maximum number of points to return (int.MaxValue by default).
  • maxDistance: (optional) maximum distance in kilometers to search within (double.MaxValue by default).
  • predicate: (optional) a lambda to filter the results with.
Distance(double lng, double lat, double lng2, double lat2)

Returns great circle distance between two locations in kilometers.


I have found the performance of this port fast enough for my purposes, so I haven't yet had the justification to run micro-bechmarks.
However, I'm sure many performance improvements are possilbe and I might get to it someday.

Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net461 net462 net463 net47 net471 net472 net48
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
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Version Downloads Last updated
1.0.1 602 4/9/2019
1.0.0 779 5/26/2018