Description Usage Arguments Details Value Author(s) References See Also Examples
View source: R/Evapotranspiration.R
Implementing the Hargreaves-Samani formulation for estimating reference crop evapotranspiration.
1 2 3 |
data |
A list of data which contains the following items (climate variables) required by Hargreaves-Samani formulation: Tmax, Tmin (degree Celcius) |
constants |
A list named |
ts |
Must be either |
message |
Must be either |
AdditionalStats |
"yes" or "no" indicating whether monthly averaged and annual averaged ET should be calculated. |
save.csv |
Must be either |
... |
Dummy for generic function, no need to define. |
This formulation provides a single calculation method with no alternatives available.
The function generates a list containing the following components:
ET.Daily |
Daily aggregated estimations of Hargreaves-Samani reference crop evapotranspiration. |
ET.Monthly |
Monthly aggregated estimations of Hargreaves-Samani reference crop evapotranspiration. |
ET.Annual |
Annually aggregated estimations of Hargreaves-Samani reference crop evapotranspiration. |
ET.MonthlyAve |
Monthly averaged estimations of daily Hargreaves-Samani reference crop evapotranspiration. |
ET.AnnualAve |
Annually averaged estimations of daily Hargreaves-Samani reference crop evapotranspiration. |
ET_formulation |
Name of the formulation used which equals to |
ET_type |
Type of the estimation obtained which is |
Danlu Guo
McMahon, T., Peel, M., Lowe, L., Srikanthan, R. & McVicar, T. 2012. Estimating actual, potential, reference crop and pan evaporation using standard meteorological data: a pragmatic synthesis. Hydrology and Earth System Sciences Discussions, 9, 11829-11910.
Hargreaves, G.H.Samani, Z.A. 1985, Reference crop evapotranspiration from ambient air temperature. American Society of Agricultural Engineers.
ET
,processeddata
,defaultconstants
,constants
1 2 3 4 5 6 7 | # Use processed existing data set and constants from kent Town, Adelaide
data("processeddata")
data("constants")
# Call ET.HargreavesSamani under the generic function ET
results <- ET.HargreavesSamani(processeddata, constants, ts="daily", message="yes",
AdditionalStats="yes", save.csv="no")
|
Loading required package: zoo
Attaching package: ‘zoo’
The following objects are masked from ‘package:base’:
as.Date, as.Date.numeric
Hargreaves-Samani Reference Crop ET
Evaporative surface: reference crop
Timestep: daily
Units: mm
Time duration: 2001-03-01 to 2004-08-31
1280 ET estimates obtained
Basic stats
Mean: 3.19
Max: 16.39
Min: 0.99
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.