regrid: Average onto a coarser regular grid

In varunayan: Download and Process 'ERA5', IMD, 'HadEX3' and 'CRU TS' Data

Average onto a coarser regular grid

Description

Each point goes into the cell of size resolution that contains it. The result has the cell centres, so a 0.5 degree grid has centres at x.25 and x.75, the same as CRU TS.

Usage

regrid(
  data,
  value,
  resolution,
  by = NULL,
  lat_col = "latitude",
  lon_col = "longitude"
)

Arguments

data	Data frame with latitude and longitude columns
value	Name of the column to average
resolution	Target cell size in degrees
by	Optional extra group columns, for example "year"
lat_col	Name of the latitude column
lon_col	Name of the longitude column

Value

Data frame with lat_col, lon_col, the by columns and value

Examples

df <- expand.grid(latitude = seq(10, 10.75, 0.25), longitude = seq(70, 70.75, 0.25))
df$t2m <- seq_len(nrow(df))
regrid(df, "t2m", resolution = 0.5)

varunayan documentation built on Oct. 30, 2026, 1:07 a.m.