In this exercise, we're going to learn how to map functions to an ImageCollection using WaPOR Actual Evapotranspiration and Interception data.
The actual evapotranspiration and interception (ETIa) (dekadal, in mm/day) is the sum of the soil evaporation (E), canopy transpiration (T), and evaporation from rainfall intercepted by leaves (I). The value of each pixel represents the average daily ETIa in a given dekad.
We're going to do the following steps:
- Upload study area polygon shapefile to the Assets
- Import the WaPOR Actual Evapotranspiration and Interception ImageCollection
- Filter on date to get all dekades in a month
- Create a function for the scaling factor
- Apply the scaling function to the ImageCollection
- Calculate the average ETIa in month
- Calculate the total ETIa in a month
- Clip the result to the study area feature
- Visualise the result using a palette
Watch this video:
The code is available in this repository under Module3/Exercise3