The work for extracting maps from the game has already been done, you just need to find ones without someone else's markings.
The maps for the new 4.0 areas are here. No dungeons, just the open world maps.
For the others, I've found that they're fairly easy to get from XIVDB.com. Just go to any page with a map, right-click on an area with no markings and choose "view image"
Also I can't run this, crashes instantly with an overflow error. Windows 10, so .net 4.5 is packaged with the OS.
************** Exception Text **************
System.OverflowException: Overflow error.
at System.Drawing.Graphics.CheckErrorStatus(Int32 status)
at System.Drawing.Graphics.DrawLine(Pen pen, Single x1, Single y1, Single x2, Single y2)
at FFXIV_Radar_NS.FFXIV_Radar_F1.DrawRadar(Graphics g)
at FFXIV_Radar_NS.FFXIV_Radar_F1.OnPaint(PaintEventAr gs e)
at System.Windows.Forms.Control.PaintWithErrorHandlin g(PaintEventArgs e, Int16 layer)
at System.Windows.Forms.Control.OnPrint(PaintEventArg s e)
at System.Windows.Forms.Control.WmPrintClient(Message & m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
************** Loaded Assemblies **************
mscorlib
Assembly Version: 4.0.0.0
Win32 Version: 4.7.2102.0 built by: NET47REL1LAST
CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll
----------------------------------------
FFXIV Radar
Assembly Version: 1.0.0.0
Win32 Version: 1.0.0.0
CodeBase: file:///D:/games/uminchu/FFXIV%20Radar.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 4.0.0.0
Win32 Version: 4.7.2104.0 built by: NET47REL1LAST
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
Assembly Version: 4.0.0.0
Win32 Version: 4.7.2103.2 built by: NET47REL1LAST
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
Assembly Version: 4.0.0.0
Win32 Version: 4.7.2046.0 built by: NET47REL1
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Configuration
Assembly Version: 4.0.0.0
Win32 Version: 4.7.2046.0 built by: NET47REL1
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Core
Assembly Version: 4.0.0.0
Win32 Version: 4.7.2102.0 built by: NET47REL1LAST
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Xml
Assembly Version: 4.0.0.0
Win32 Version: 4.7.2102.0 built by: NET47REL1LAST
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
System.Numerics
Assembly Version: 4.0.0.0
Win32 Version: 4.7.2046.0 built by: NET47REL1
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Numerics/v4.0_4.0.0.0__b77a5c561934e089/System.Numerics.dll
----------------------------------------