1

I got a list of values and I could print them to the Console. It looks like this:

{
    "chlor_a": 0.12718113166405862
  },
  {
    "chlor_a": 0.37072379355468843
  },

How can I export it to my Drive account in csv format?

This is the code so far:

var bo=ee.FeatureCollection('users/broadsky2008/Border');

var chla = ee.ImageCollection("NASA/OCEANDATA/MODIS-Aqua/L3SMI")
.filterDate('2012-7-04', '2018-1-25')
.select('chlor_a');

var reduceR = function(image) {
  return image.set('number',image.reduceRegion({
  reducer: ee.Reducer.mean(),
  geometry: bo.geometry(),
 }));
};

// Map the function over the collection and display the result.
var mChla=chla.map(reduceR);


// Get a list of the numbers.
var numberList = mChla.aggregate_array('number');

print(numberList);
2

The argument(s) to set() should be either a key, value pair or a dictionary. Here is your (corrected) example, assuming you've got a geometry called geometry defined somewhere:

var chla = ee.ImageCollection("NASA/OCEANDATA/MODIS-Aqua/L3SMI")
  .filterDate('2018-1-04', '2018-1-25')
  .select('chlor_a');

var reduceR = function(image) {
  return image.set(image.reduceRegion({
    reducer: ee.Reducer.first(),
    geometry: geometry,
 }));
};

var mChla=chla.map(reduceR);

Export.table.toDrive({
  collection: ee.FeatureCollection(mChla), 
  description: 'foo', 
  fileNamePrefix: 'foo', 
  fileFormat: 'CSV', 
  selectors: ['chlor_a']
});

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