How can I extract spatially varying scalar data from a dfs2 file to match a model setup using another projection?


Use MIKE SDK to create a small tool that can extract the values in a specific area, interpolate and save the scalar data to a new file - see example in Fig. 1.

Fig. 1 -  Plot showing domain with input area (blue palette) and output area (rainbow palette)


The input data is defined in LONG/LAT and covers a large area (input.dfs2). The output data is derived in a smaller area, defined by a grid with the origin (50.632, -2.0114) oriented -8.555 deg.N. The grid data is saved in WGS_1984_UTM_Zone_32N using 119 x 104 grid cells with a grid spacing of 16668 m in both directions.


The source code for extracting the data to output.dfs2 looks as follows in the file Reproject.cs: 


using System;
using System.Collections.Generic;
using System.Linq;
using DHI.Generic.MikeZero.DFS;
using DHI.Generic.MikeZero.DFS.dfs123;

namespace DHI.Generic.MikeZero.DFSTest
   class Program  
      /// <summary>
      /// Static constructor, setting up search paths for MIKE assemblies
      /// </summary>
      static Program()
        // The setup method will make your application find the MIKE assemblies at runtime.
        if (!DHI.Mike.Install.MikeImport.Setup(22, DHI.Mike.Install.MikeProducts.Mike1D))
          throw new Exception("Could not find a MIKE installation");

     /// <summary>    
     /// Main method, Extract spatially varying data from a dfs2 to match another projection    
     /// </summary>    
     public static void Main(string[] args)    
         string sourceFilename  =  "Input.dfs2";
         string targetFilename =  "Output.dfs2";

         string targetProj = @"PROJCS[""WGS_1984_UTM_Zone_32N"",GEOGCS[""GCS_WGS_1984"",DATUM[""D_WGS_1984"",SPHEROID[""WGS_1984"",6378137,298.257223563]],PRIMEM[""Greenwich"",0],UNIT[""Degree"",0.017453292519943295]],PROJECTION[""Transverse_Mercator""],PARAMETER[""False_Easting"",500000],PARAMETER[""False_Northing"",0],PARAMETER[""Central_Meridian"",9],PARAMETER[""Scale_Factor"",0.9996],PARAMETER[""Latitude_Of_Origin"",0],UNIT[""Meter"",1]]";
        Dfs2File dfs2source = DfsFileFactory.Dfs2FileOpen(sourceFilename);

        Dfs2Reprojector reproj = new Dfs2Reprojector(dfs2source, targetFilename);
        reproj.Interpolate = true;
        reproj.SetTarget(targetProj, -2.0114, 50.632, -8.555, 119, 0, 16668, 104, 0, 16668);


        // Load new file and ensure axis unit is meter
        IDfsFile dfsFile = DfsFileFactory.DfsGenericOpenEdit("projected.dfs2");

        foreach (var itemInfo in dfsFile.ItemInfo)
             itemInfo.SpatialAxis.AxisUnit = eumUnit.eumUmeter;
         // Close File


The build statement to create the executionable ‘ReprojectDfs2.exe’ looks as follows: 

set csc=c:\windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
set sdkBin=c:\Program Files (x86)\DHI\MIKE Core SDK\2024\bin\x64
%csc% /r:"%sdkBin%\DHI.Generic.MikeZero.DFS.dll" /r:"%sdkBin%\DHI.Generic.MikeZero.EUM.dll" /r:"%sdkBin%\DHI.Mike.Install.dll" /r:"netstandard.dll" ReprojectDfs2.cs

Note: MIKE Core SDK installation contains the source code for several more examples. Compiled versions of various tools are also available from GitHub at


Manuals and User Guides
MIKE Core SDK Documentation Index

Release Notes
MIKE Core SDK Release Note



Related Products: MIKE 21/3