An exercise for beginners
Step 1: open the code editor by going to https://code.earthengine.google.com/
Step 2: import the sentinel 2 image collection by following the steps below:
Tip!: you can also use the line below to import your sentinel 2 image collection
var sentinel2 = ee.ImageCollection("COPERNICUS/S2");
Step 3: import your administrative area:
var bnd_cambodia = ee.FeatureCollection("projects/servir-mekong/referenceData/cam_adm");
Step 4: create 2 mosaics, 1 for the dry season and 1 for the wet season in 2019. Use the months jan – april for the dry season, the months jun – oct for the wet season. Make sure you sort the image collection based on cloud cover and clip the mosiac.
Tip! use the functions: .filterDate() .filterBounds() .sort() .mosaic() .clip()
Step 5: use the .normalizedDifference([“band1”,”band2”) function to calculate the Normalized Difference Water Index (NDWI). Replace the “band1” and “band2” with the relevant bands:
Tip: you can find the band designations in the “BANDS” tab
Step 6: show the RGB imagery of the Dry and Wet season and the NDWI maps you created.
Find the full code here: