SharpProj - Providing OSGEO PROJ for .Net (Core)

Use the real OSGeo PROJ implementation, implemented the .Net way, reusable and available as simple to use package on NuGet.

https://www.nuget.org/packages/SharpProj/

Usage

using SharpProj;

using var rd = CoordinateReferenceSystem.CreateFromEpsg(28992);
using var wgs84 = CoordinateReferenceSystem.CreateFromEpsg(4326);

var area = rd.UsageArea;
Assert.AreEqual("Netherlands - onshore, including Waddenzee, Dutch Wadden Islands and 12-mile offshore coastal zone.", area.Name);

using (var t = CoordinateTransform.Create(rd, wgs84))
{
    var r = t.Apply(new PPoint(155000, 463000));
    Assert.AreEqual(new PPoint(52.155, 5.387), r.ToXY(3)); // Round to 3 decimals for easy testing
}

Building SharpProj

Setup build environment using:

mkdir dev
cd dev
git clone https://github.com/Microsoft/vcpkg.git
git clone https://github.com/AmpScm/SharpProj.git
cd vcpkg
bootstrap-vcpkg.bat
vcpkg install proj[core,tiff]:x64-windows-static-md proj[core,tiff]:x86-windows-static-md proj[core,tiff]:arm64-windows-static-md tiff[core,lzma,zip]:x64-windows-static-md tiff[core,lzma,zip]:x86-windows-static-md tiff[core,lzma,zip]:arm64-windows-static-md
cd ..

The explicit feature selection here explicitly builds PROJ without the builtin network support to remove the curl dependency. It also disables 'jpeg' support in tiff. This shrinks the library and allows configuring http(s) the .NET way. The network requests are just forwared to the .Net WebClient class using a bit of code in SharpProj (see ProjNetworkHandler.cpp).

This script handles the assumption inside SharpProj that the library and header files required can be found in ../vcpkg/installed/. If you choose a different layout you will need a custom setup later on. But with just this you are now able to build using either Visual Studio 2019 or 2022.

Handling PROJ updates with major proj.db changes

SharpProj needs a working proj.db to run its tests. if you are bumping proj to a new version you may need to run $ scripts\gh-version-setup ..\vcpkg\installed\x86-windows-static-md\include\proj.h 1 $ scripts\gh-build-nuget.cmd --db-only To create a local newer than official nuget package for the proj data. Then update the test package to reference it. This should fix the chicken-and-egg problem for bootstrapping without a proper package in the nuget repository. Usually I will fix this for you shortly after a new majr proj X is released/

Error in ALINK 'access denied'

If you see this on your box you can fix this by runnning

$ reg add HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\StrongName /v MachineKeyset /t REG_DWORD /d 0 $ reg add HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\StrongName /v MachineKeyset /t REG_DWORD /d 0 (From: https://stackoverflow.com/questions/4606342/signing-assembly-access-is-denied )