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Files->Export->Nodes->Raster...

thenThis will prompt a pop up window, asking to insert a File Name. Once inserted and clicked the Save button, a second pop up window will appear, this time it will ask for the grid size. After having clicked the OK button it is required to select all the nodes to be exported. Finally press the Escape key to complete the process. 

Then, the raster can be re-imported with

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

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Grid from Internet

GiD 14 incorporates the possibility to obtain a grid from the place of the world we want using:

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