isea3h: ISEA Aperture 3 Hexagon (ISEA3H) Discrete Global Grid

Description Usage Format References

Description

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 DGGRID software. The original .gen files were converted to a data frame using the function dggrid_gen_to_df, available with the dggrids package. Only resolutions 0–6 are supplied with FRK and note that resolution 0 of ISEA3H is equal to resolution 1 in FRK. For higher resolutions dggrids can be installed from https://github.com/andrewzm/dggrids using devtools.

Usage

1

Format

A data frame with 284,208 rows and 5 variables:

id

grid identification number within the given resolution

lon

longitude coordinate

lat

latitude coordinate

res

DGGRID resolution (0 – 6)

centroid

A 0-1 variable, indicating whether the point describes the centroid of the polygon, or whether it is a boundary point of the polygon

References

Sahr, K. (2008). Location coding on icosahedral aperture 3 hexagon discrete global grids. Computers, Environment and Urban Systems, 32, 174–187.


FRK documentation built on May 2, 2019, 8:11 a.m.