This function takes a series of variables used in calculating AGDD and returns a raster of the continental USA with each pixel representing the calculated AGDD value based on start and end date. This function leverages the USA-NPN geo web services.
npn_get_custom_agdd_raster(
method,
climate_data_source,
temp_unit,
start_date,
end_date,
base_temp,
upper_threshold = NULL
)Takes "simple" or "double-sine" as input. This is the AGDD
calculation method to use for each data point. Simple refers to simple
averaging.
Specified the climate data set to use. Takes
either "PRISM" or "NCEP" as input.
The unit of temperature to use in the calculation. Takes
either "Fahrenheit" or "Celsius" as input.
Date at which to begin the AGDD calculations.
Date at which to end the AGDD calculations.
This is the lowest temperature for each day for it to be considered in the calculation.
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.
A terra::SpatRaster object of each calculated AGDD numeric values based on specified time period/method/base temp/data source.