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Layer>Save As (Select KML) [Data is in OSGB36 Ordnance Survey GB] Open in Google Earth to check it is in the correct position
Most GIS desktop software apps have ability to plot table or csv data based on lng/lat or x/y values to generate a point event layer. Event layers may then be exported to a GIS layer (e.g. shapefile), and then you may run a spatial analysis interpolation tool or script to create the raster surface similar to your link example. Finally, these raster layers ...
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