Package index • hexify

Core

Create grids and assign points to cells

hex_grid(): Create a Hexagonal Grid Specification
hexify(): Assign hexagonal DGGS cell IDs to geographic points
hexify_assign(): Assign hex cells ('ISEA3H', aperture 3) for lon/lat
HexGridInfo-class: HexGridInfo Class
HexData-class: HexData Class

Working with Results

Extract and convert HexData

grid_info(): Get Grid Specification
st_crs(<HexGridInfo>) st_crs(<HexData>): Coordinate reference system of a grid
cells(): Get Cell IDs
n_cells(): Get Number of Cells
summary(<HexGridInfo>) print(<hexify_grid_summary>) summary(<HexData>) print(<hexify_data_summary>): Summary of a grid or of gridded data
st_as_sf(<HexData>) st_as_sf(<HexGridInfo>): Convert gridded data or a grid to sf
as_tibble(<HexData>): Convert HexData to tibble
is_hex_grid(): Check if object is HexGridInfo
is_hex_data(): Check if object is HexData
hex_summarize(): Summarize Data by Hex Cell
hex_smooth(): Smooth cell values over neighbouring cells
hex_zonal(): Zonal Statistics for Hex Cells
hex_extract(): Extract Raster Values at Hex Cell Centers

Grid Generation

Create grids over regions

grid_rect(): Generate a rectangular grid of hexagons
grid_global(): Generate a global hexagon grid
grid_clip(): Clip hexagon grid to polygon boundary
cell_to_sf(): Convert cell IDs to sf polygons
lonlat_to_cell(): Convert longitude/latitude to cell ID
cell_to_lonlat(): Convert cell ID to longitude/latitude
get_parent(): Get parent cell
get_children(): Get children cells
get_siblings(): Sibling cells

Cell Operations

Relations between cells and cell sets

get_neighbors(): Get Neighboring Cells
hex_distance(): Grid Distance Between Cells
is_pentagon(): Detect Pentagon Cells
hex_compact(): Compact Hex Cells
hex_uncompact(): Uncompact Hex Cells
hex_sample(): Random points inside cells

H3 Interoperability

Cross-grid mapping and per-cell area

h3_crosswalk(): Crosswalk Between ISEA and H3 Cell IDs
cell_area(): Compute per-cell area in km²
import_h3(): Import External H3 Cell IDs into hexify
dggrs_definition(): Definition of a grid as a Discrete Global Grid Reference System

Cell Metrics

Shape and spacing of a grid’s cells

cell_metrics(): Shape metrics of cells: area, perimeter and compactness
wall_metrics(): Spacing metrics of neighbouring cells: wall length, centre distance and cell wall midpoint ratio
projection_distortion(): Distortion of a grid's face projection

Visualization

Plotting functions

hexify_heatmap(): Create a ggplot2 visualization of hexagonal grid cells
plot_grid(): Plot hexagonal grid clipped to a polygon boundary
plot_world(): Quick world map plot
plot(<HexGridInfo>,<missing>): Plot a grid on the sphere, on its solid, or on the unfolded net
net_layout(): Lay out the faces of a grid's solid in the plane
net_project(): Place points on a net layout
net_cells(): The parts of cells on a net layout
hex_rays(): Ray glyphs for cell values
hex_triangles(): The triangles of cells towards each neighbour
hex_globe(): Interactive globe of a grid
hex_globe_png(): Save a globe as a PNG image
hexify_world: Simplified World Map
globe_centers: Globe center presets
hex_browse(): Interactive Hex Map
plot(<HexData>,<missing>): Plot HexData objects

dggridR Compatibility

Interoperability with dggridR

as_dggrid(): Convert hexify grid to 'dggridR'-compatible grid object
from_dggrid(): Convert 'dggridR' grid object to hexify_grid
dggrid_is_compatible(): Validate 'dggridR' grid compatibility with hexify
dggrid_43h_sequence(): Create DGGRID 43H aperture sequence
hexify_grid(): Create a hexagonal grid specification
dgearthstat(): Get grid statistics for whole-body coverage
dgverify(): Verify grid object
hexify_compare_resolutions(): Compare grid resolutions

Low-Level API

Direct access to projection and coordinate transforms

hexify_forward(): Forward face projection
hexify_forward_to_face(): Forward projection to specific face
hexify_inverse(): Inverse face projection
hexify_which_face(): Determine which face contains a point
hexify_build_icosa(): Set the default icosahedron orientation
hexify_face_centers(): Get face centers of a solid
hexify_grid_rect(): Generate a rectangular grid of hexagon polygons
hexify_grid_global(): Generate a global grid of hexagon polygons
hexify_grid_to_cell(): Convert longitude/latitude to cell ID using a grid object
hexify_grid_cell_to_lonlat(): Convert cell ID to longitude/latitude using a grid object
hex_corners_to_sf(): Build an sf POLYGON from six (lon, lat) corner pairs
dg_closest_res_to_area(): Find closest resolution for target cell area
hexify_area_to_eff_res(): Convert area to effective resolution
hexify_eff_res_to_area(): Convert effective resolution to area
hexify_eff_res_to_resolution(): Convert effective resolution to index resolution
hexify_resolution_to_eff_res(): Convert index resolution to effective resolution
hexify_compare_indices(): Compare two indices
hexify_default_index_type(): Get default index type for aperture
hexify_is_valid_index_type(): Check if index type is valid for aperture
cell_to_index(): Convert cell ID to hierarchical index string
hexify_get_children(): Get children indices
hexify_get_parent(): Get parent index
hexify_get_resolution(): Get index resolution
hexify_z7_canonical(): Get canonical form of Z7 index
hexify_roundtrip_test(): Round-trip accuracy test

Internal

Package internals

hexify-package: hexify
hexify-conversions: Coordinate Conversions
hexify-grid: Core Grid Construction
hexify-stats: Grid Statistics
`$`(<HexGridInfo>) n_cells(<HexGridInfo>) names(<HexGridInfo>) show(<HexGridInfo>) as.list(<HexGridInfo>): HexGridInfo S4 Methods
grid_info(<HexData>) cells(<HexData>) n_cells(<HexData>) nrow(<HexData>) ncol(<HexData>) dim(<HexData>) names(<HexData>) `$`(<HexData>) `$<-`(<HexData>) `[`(<HexData>) `[[`(<HexData>) `[[<-`(<HexData>,<ANY>,<missing>) show(<HexData>) as.data.frame(<HexData>) as.list(<HexData>): HexData S4 Methods
new_hex_data(): Create a HexData Object (Internal)
extract_grid(): Extract grid from various objects
calculate_resolution_for_area(): Calculate resolution for target area
hexify_grid_to_HexGridInfo(): Convert legacy hexify_grid to HexGridInfo
HexGridInfo_to_hexify_grid(): Convert HexGridInfo to legacy hexify_grid