GetERA5DailyHeatIndexData: Download ERA5 data and calculate heat stress indices

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

Download ERA5 data and calculate heat stress indices

Description

This function downloads ERA5 temperature, dewpoint, and wind data for a region. Then it calculates the heat stress indices.

Usage

GetERA5DailyHeatIndexData(
  request_id,
  start_date,
  end_date,
  json_file = NULL,
  north = NULL,
  south = NULL,
  east = NULL,
  west = NULL,
  solar_load = FALSE,
  resolution = 0.25,
  use_cache = TRUE,
  verbose = FALSE
)

get_era5_daily_heat_index_data(
  request_id,
  start_date,
  end_date,
  json_file = NULL,
  north = NULL,
  south = NULL,
  east = NULL,
  west = NULL,
  solar_load = FALSE,
  resolution = 0.25,
  use_cache = TRUE,
  verbose = FALSE
)

GetERA5DailyHeatData(
  request_id,
  start_date,
  end_date,
  json_file = NULL,
  north = NULL,
  south = NULL,
  east = NULL,
  west = NULL,
  solar_load = FALSE,
  resolution = 0.25,
  use_cache = TRUE,
  verbose = FALSE
)

get_era5_daily_heat_data(
  request_id,
  start_date,
  end_date,
  json_file = NULL,
  north = NULL,
  south = NULL,
  east = NULL,
  west = NULL,
  solar_load = FALSE,
  resolution = 0.25,
  use_cache = TRUE,
  verbose = FALSE
)

Arguments

request_id	Unique identifier for the data request
start_date	Start date in "YYYY-MM-DD" format
end_date	End date in "YYYY-MM-DD" format
json_file	Path to the GeoJSON file that defines the region (for the geojson method)
north	Northern latitude boundary (for the bbox method)
south	Southern latitude boundary (for the bbox method)
east	Eastern longitude boundary (for the bbox method)
west	Western longitude boundary (for the bbox method)
solar_load	If TRUE, include solar radiation in the calculations (default: FALSE). If TRUE, the function downloads solar radiation data and uses these data for WBGT and UTCI.
resolution	Spatial resolution in degrees (default: 0.25)
use_cache	If TRUE, the function uses cached data when the data is available (default: TRUE)
verbose	If TRUE, the function prints progress messages (default: FALSE)

Value

data.frame with columns: date, latitude, longitude, temp_c, dewpoint_c, wind_speed, rh, wet_bulb, heat_index, wbgt, utci, humidex, wbgt_risk, heat_index_risk, utci_stress. If solar_load=TRUE, the data.frame also contains solar_radiation.

Examples

region <- system.file("extdata", "region.geojson", package = "varunayan")
heat_data <- GetERA5DailyHeatIndexData(
  request_id = "india_heat_2023",
  start_date = "2023-05-01",
  end_date = "2023-05-31",
  json_file = region
)

# With solar radiation for outdoor WBGT
heat_data <- GetERA5DailyHeatIndexData(
  request_id = "india_heat_2023_solar",
  start_date = "2023-05-01",
  end_date = "2023-05-31",
  json_file = region,
  solar_load = TRUE
)

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