This utility generates an ASCII-raster file based on a 2D surface mesh. A raster is superimposed on the mesh and pixel values are set to the surface elevation at each pixel’s position. If no mesh element is located beneath a pixel it’s value is set to NODATA.
Mesh2Raster -i <string> -o <string> [-c <real>] Where: -i <string>, --input-file <string> (required) Mesh input file (*.vtu, *.msh) -o <string>, --output-file <string> (required) Raster output file (*.asc) -c <real>, --cellsize <real> edge length of raster cells in result
c specifies the cell size (i.e. pixel size) of the raster. While optional, it is still recommended to choose a value as the default will be set to the minimum edge length in the input mesh which for unstructured grids may result in a very fine and (extremely) large output raster.
The input mesh for this example is a homogeneous, unstructured triangle mesh with an average edge length of 100m.
Mesh2Raster -i input.vtu -o output.asc -c 50
Mesh2Raster -i input.vtu -o output.asc -c 200
Mesh2Raster -i input.vtu -o output.asc -c 1000
The resulting ASCII-rasters can be used to represent surface data in geographic information systems. In the absense of input data, a detailed raster can also be used by OpenGeoSys preprocessing tools to generate new surface meshes with different resolution or properties.