Comment every line of the following piece of code! What does it do?

 

This code is used to validate an already processed classification called 'rfclassified' using a validation sample set called 'valMerge'.

Then, an Error Matrix is calculated to evaluate the classifications accuracy.

 

var rfvalidation = rfclassified.sampleRegions({ //Initiates the validation
 collection: valMerge, //Choose the merged validation samples 
 properties: ['landcover'], //Choose geometry field 'landcover' as property
 scale: 30, //Set spatial resolution
});
print(rfvalidation, 'Random Forest Validation');//Print the results to the console
 
var rfTestAccuracy = rfvalidation.errorMatrix('landcover', 'classification'); //Create an Error Matrix for evaluation purposes
print(rfTestAccuracy, 'Validation of the Random Forest Error Matrix'); //Print Error Matrix to the Console
print(rfTestAccuracy.accuracy(), 'Random Forest Overall Accuracy'); //Print Overall Accuracy to the Console