The data used here were obtained from
http://webpages.sou.edu/~sahrk/dgg/isea.old/gen/isea3h.html and represent ISEA
discrete global grids (DGGRIDs) generated using the
The original .gen files were converted to a data frame using the function
available with the
dggrids package. Only resolutions 0–6 are supplied with
and note that resolution 0 of ISEA3H is equal to resolution 1 in
FRK. For higher
dggrids can be installed from
A data frame with 284,208 rows and 5 variables:
grid identification number within the given resolution
DGGRID resolution (0 – 6)
A 0-1 variable, indicating whether the point describes the centroid of the polygon, or whether it is a boundary point of the polygon
Sahr, K. (2008). Location coding on icosahedral aperture 3 hexagon discrete global grids. Computers, Environment and Urban Systems, 32, 174–187.
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