Get Custom AGDD Time Series — npn_get_custom_agdd_time

This function takes a series of variables used in calculating AGDD and returns an AGDD time series, based on start and end date, for a given location in the continental US. This function leverages the USA-NPN geo web services

npn_get_custom_agdd_time_series(
  method,
  start_date,
  end_date,
  base_temp,
  climate_data_source,
  temp_unit,
  lat,
  long,
  upper_threshold = NULL
)

Arguments

method: Takes "simple" or "double-sine" as input. This is the AGDD calculation method to use for each data point. Simple refers to simple averaging.
start_date: Date at which to begin the AGDD calculations.
end_date: Date at which to end the AGDD calculations.
base_temp: This is the lowest temperature for each day for it to be considered in the calculation.
climate_data_source: Specified the climate data set to use. Takes either "PRISM" or "NCEP" as input.
temp_unit: The unit of temperature to use in the calculation. Takes either "Fahrenheit" or "Celsius" as input.
lat: The latitude of the location for which to calculate the time series.
long: The longitude of the location for which to calculate the time series.
upper_threshold: This parameter is only applicable for the double-sine method. This sets the highest temperature to be considered in any given day's AGDD calculation.

Value

A data frame containing the numeric AGDD values for each day for the specified time period/location/method/base temp/data source.