| npn_get_custom_agdd_raster {rnpn} | R Documentation |
Get Custom AGDD Raster Map
Description
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.
Usage
npn_get_custom_agdd_raster(
method,
climate_data_source,
temp_unit,
start_date,
end_date,
base_temp,
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. |
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. |
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. |
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 raster object of each calculated AGDD numeric values based on specified time period/method/base temp/data source.