Aggregate values to hierarchical ancestors

Parent assignment uses the Z7 or Z3 digit-string hierarchy directly; it does not perform polygon operations or invoke DGGRID. With fun = NULL, numeric values use the mean, logical values use a majority rule, and categorical values use the mode. Summation is always explicit (fun = sum).

Usage

cell_aggregate(x, resolution, fun = NULL, na.rm = TRUE, value = NULL)

Arguments

x

A hex_data() object.

resolution

Target ancestor resolution.

fun

A summary function or function name. NULL selects a conservative type-aware default.

na.rm

Whether to remove missing values before aggregation.

value

Attribute columns to aggregate. NULL aggregates all columns.

Value

A globalhex_data object with one row per represented ancestor.

Examples

cells <- point_to_cell(rbind(c(0, 0), c(0.01, 0.01)), 5)
cell_aggregate(hex_data(cells, value = c(1, 3)), 4)
#> # A tibble: 1 × 2
#>   cell      value
#>   <gh_cell> <dbl>
#> 1 036565        2