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I have use the following function to calculate the area of an area of interest (AOI) of a classification using landsat8 images. this counts the area in square meters of the classification for a given polygon.

var areaChart = ui.Chart.image.byClass({
  image: ee.Image.pixelArea().addBands(lista_imagenes[0]),
  classBand: 'classification', 
  region: geometry,
  scale: 30,
  reducer: ee.Reducer.sum()
});

The problem is that the band of classification of landsat8 is just one (classification band). And the layer I am using has three layers (it is call year of loss).

There is any way to count the classes of the layer given a polygon using a similar question ?

here the code: https://code.earthengine.google.com/495ed315756b7181b4570546be82e2f4

0

i Just found the way to solve the problem, everything is in the following link (google documentation).

https://developers.google.com/earth-engine/tutorial_forest_03a

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