Skip to contents

Fetch NASA POWER Data for Multiple Locations with a Progress Bar

get_nasapower.Rd

This function downloads daily NASA POWER data for specified weather variables over a specified number of days around a given date column for multiple locations. It includes a progress bar to show the download progress.

Usage

get_nasapower(
  data,
  days_around,
  date_col,
  pars = c("T2M", "RH2M", "PRECTOTCORR", "T2M_MAX", "T2M_MIN", "T2MDEW")
)

Arguments

data

A data frame containing the input data, including columns for latitude, longitude, study identifier, and the date column.

days_around

An integer specifying the number of days before and after the date in the date column to download data.

date_col

A character string specifying the name of the date column in the data frame.

pars

A character vector specifying the weather variables to fetch from NASA POWER (default: c("T2M", "RH2M", "PRECTOTCORR", "T2M_MAX", "T2M_MIN", "T2MDEW")).

Value

A data frame with the downloaded weather data from NASA POWER, combined for all specified locations. Includes a new variable study indicating the study identifier from the input data. Returns an empty data frame if no data is retrieved.

Details

The function uses the get_power function from the nasapower package to fetch weather data for a range of dates around the specified date column for each location. A progress bar is shown during the data download process, and the results are combined into a single data frame.

Examples

if (FALSE) {
# Sample data
data <- data.frame(
  study = c("Study1", "Study2"),
  latitude = c(-15.78, -20.45),
  longitude = c(-47.93, -54.82),
  heading = c("2022-05-10", "2022-05-15")
)

# Fetch weather data with a progress bar
results <- get_nasapower(data, days_around = 28, date_col = "heading")
}