season_uvb: Seasonal UVB

In UVdose: Estimate Ambient UV Dose from Location and Date Info

Seasonal UVB

Description

This function estimates mean or cumulative vitamin D-effective UVB dose over a period of months (<1 year) prior to the index date, at a given geographical location (longitude and latitude).

Usage

season_uvb(
  data,
  date,
  longitude,
  latitude,
  temis_path = getwd(),
  season = "summer",
  type = "cumulative",
  region = "europe"
)

Arguments

data	data frame containing sample IDs, date, longitude, and latitude
date	A date vector, usually date of assessment or recruitment.
longitude	A numeric vector of longitude values.
latitude	A numeric vector of latitude values.
temis_path	Path to TEMIS UV files downloaded using temis_uvdvc. Default is current directory.
season	The duration over which erythemal UV dose is to be estimated. One of "summer" covering April to September (default), "winter" covering October to March, or a numeric vector corresponding to month range.
type	Type of annual dose to be calculated, cumulative (default) or mean.
region	Region of TEMIS data required, options are "europe" (default) or "world".

Value

A numeric vector of mean or cumulative seasonal UVB dose estimates.

Examples

#uses sample TEMIS file
mysample <- data.frame(id = c("id000016"),
        date = as.Date(c("2010-08-04")),
        longitude = c(-2.10),
        latitude = c(50.5))
uvb_example <- system.file("extdata", "uvb_example", package="UVdose")
season_uvb(mysample, date, longitude, latitude, temis_path=uvb_example,  season = "winter")

season_uvb(mysample, date, longitude, latitude, temis_path=uvb_example, season = c(6:8))

UVdose documentation built on Nov. 5, 2025, 7:38 p.m.