imd_rainfall_point: Download and process IMD rainfall for a single point (nearest...

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

Download and process IMD rainfall for a single point (nearest grid cell)

Description

Extracts the daily rainfall series for the IMD grid cell that is nearest to a (lat, lon) point. For each year, the function reads only that one cell from the disk. Thus, this function is the method with the lowest cost to get a long series for one location.

Usage

IMDRainfallPoint(...)

imd_rainfall_point(
  request_id,
  start_year,
  end_year,
  latitude,
  longitude,
  resolution = 0.25,
  frequency = "daily",
  save_raw = FALSE,
  output_dir = tempdir(),
  use_cache = TRUE
)

Arguments

...	Arguments that the aliases send to the primary function.
request_id	Unique identifier for the request.
start_year	Start year (1901-2024).
end_year	End year (1901-2024).
latitude	Latitude of the point.
longitude	Longitude of the point.
resolution	Spatial resolution: 0.25 or 1.0 degrees (default: 0.25).
frequency	Temporal frequency: "daily", "monthly", "yearly" (default: "daily").
save_raw	If TRUE, keep the raw downloaded files (default: FALSE).
output_dir	Directory for the output files (default: tempdir()).
use_cache	If TRUE, use the cached data when it is available (default: TRUE).

Value

data.frame with the rainfall series of the nearest cell.

Examples

powai <- tryCatch(
  imd_rainfall_point("powai", 2023, 2023, 19.1277, 72.9047,
    resolution = 1, use_cache = FALSE
  ),
  error = function(e) message("IMD server unavailable: ", conditionMessage(e))
)

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