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Create again a new model (Files->New) and import the XYZ file but now as mesh nodes, and without connect them with triangles

Files->Import->XYZ nodes...

We can build a regular square grid of squares withusing

Geometry->Create->Geometry from mesh->Nodes→grid surfaces

Enter a grid cell size of 20 units And and select all nodes.

A regular grid of surfaces will be created, with z of points approximated from the selected nodes

Using Nodes→grid Using Nodes→grid surfaces the z's are approximated with an averaged value based on inverse of distance to a power of close nodes.

Using Triangles→grid surfaces the surfaces (in case the input data are triangles, not just nodes) the z's are would interpolated projecting the node over the selected triangles (. This option could be more expensive).

Note: A regular grid is easier to manipulate than a TIN.

Instead of create surfaces of geometry it is possible to create mesh entities, or export the grid data in a file (ARC/Info grid ASCII format, supported by most 'Geographic Information System' GIS programs). If you export a raster file using

Files->Export->Nodes→Raster...

A then, the raster can be re-imported with

Files->Import->Raster GDAL...

This import support option supports several common raster formats , based on the GDAL library (like geotiff, ARC/Info ASCII or binary, png, jpg, ...)And allow among others (based on the GDAL library), and allows to create geometry, mesh, write as ARC/Info ASCII, and also sub-sample data for big files.

e.g. For instance, subsampling with increment=2 will take into account one of each 2 point data in each direction, like shown in the figure hereafter.

Grid from Internet

It is possible to obtain a grid from the place of the world we want using:

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