Chapter 2 - Supplementary material

1. Details about the following files can be found at the ‘Sampling/GTN 160x160 km’ web page of the IUGS Commission on Global Geochemical Baselines.

(a) Global Reference Network grid cells of 160x160 km files:

• IUGS-CGGB_19833_GRN_160x160km_grid_cells.xlsx (Microsoft™ Excel workbook file containing the 19,833 grid cells that cover the whole globe).

• IUGS-CGGB_GRN_19833_160x160km_grid_cells.zip (same as above but in a Google Earth kml file format). When unzipped the file name is:

  IUGS-CGGB_19833_GRN_160x160km_grid_cells.kml.

(b) Global Terrestrial Network grid cells of 160x160 km files:

• IUGS-CGGB_7356_GTN_160x160km_grid_cells.xlsx (Microsoft™ Excel workbook file with the 7356 grid cells of the Global Terrestrial Network each of 160x160 km).

• IUGS-CGGB_7356_GTN_grid_cells_160x160km.zip (same as above but in a Google Earth kml file format). When unzipped the file name is:

        IUGS-CGGB_7356_GTN_grid_cells_160x160km.kml.

2. Details about the following six files can be found at the ‘Sampling/Sampling Design’ web page of the IUGS Commission on Global Geochemical Baselines.

(c) Randomly selected points in each Global Terrestrial Network grid cell:

• IUGS-CGGB_5-random-points_per_GTN_160x160km-grid-cell.xlsx (Microsoft™ Excel workbook file with 5 random points in each of the 7356 grid cells of 160x160 km totalling 36,780 random sampling points).

• IUGS-CGGB_5-random-points_per_GTN_160x160km-grid-cell.zip (same as above but in a Google Earth kml file format). When unzipped the file name is: IUGS-CGGB_5-random-points_per_GTN_160x160km-grid-cell.kml.

• IUGS-CGGB_8-random-points_per_GTN_160x160km-grid-cell.xlsx (Microsoft™ Excel workbook file with 8 random points in each of the 7356 grid cells of 160x160 km totalling 58,848 random sampling points).

• IUGS-CGGB_8-random-points_per_GTN_160x160km-grid-cell.zip (same as above but in a Google Earth kml file format). When unzipped the file name is: IUGS-CGGB_8-random-points_per_GTN_160x160km-grid-cell.kml.

• IUGS-CGGB_16-random-points_per_GTN_160x160km-grid-cell.xlsx (Microsoft™ Excel workbook file with 16 random points in each of the 7356 grid cells of 160x160 km totalling 117,696 random sampling points). It is noted that this sampling density is not recommended for the Global Geochemical Reference Network.

• IUGS-CGGB_16-random-points_per_GTN_160x160km-grid-cell.zip (same as above but in a Google Earth kml file format). When unzipped the file name is: IUGS-CGGB_16-random-points_per_GTN_160x160km-grid-cell.kml.

For more information consult the "International Union of Geological Sciences Manual of Standard Methods for Establishing the Global Geochemical Reference Network".