Google Earth Engine: Calculating image statistics for multiple study regions simultaneously

Question

I am trying to calculate burned area for the districts of Punjab state. I have used following code

var admin2 = ee.FeatureCollection("FAO/GAUL_SIMPLIFIED_500m/2015/level2");
var state = admin2.filter(ee.Filter.eq('ADM1_CODE', 1505));
print(village)
var area = village.geometry();
// Show the state polygon with a blue outline
var outline = ee.Image().byte().paint({
  featureCollection: village,
  color: 1,
  width: 3
});
Map.addLayer(outline, {palette: ['red']}, 'AOI')
var dataset4 = ee.ImageCollection('MODIS/006/MCD64A1')
                  .filter(ee.Filter.date('2010-01-01', '2010-12-31'));
var burnedArea2 = dataset4.select('BurnDate').mosaic().clip(area);
var burnedAreaVis = {
  min: 1.0,
  max: 366.0,
  palette: ['fd4100', 'fb8200','ff0000','080fff','df2fff', 'f9c400', 'f2ff00', 'b6ff05',
    '7787f9', '8b211c', '088712', '21f5ff'],
};
Map.addLayer(burnedArea2, burnedAreaVis, 'MCD64A1 Burned Area');

///////area calculation MODIS MCD64A1/////
var burnedB = burnedArea2.select('BurnDate');
var pixelArea = ee.Image.pixelArea().updateMask(burnedB.mask());
print(pixelArea);

var stats = pixelArea.reduceRegion({
  reducer: ee.Reducer.sum(),
  geometry: area,
  scale: 500,
  maxPixels: 10e13,
  //tileScale: 4
});
print('pixels representing MCD64A1 Burned Area: ', stats.get('area'), 'square meters');

The results I am getting are kind of cumulative for all the polygons as follows

However I want to get statistics for all the districts (shown in figure below) separately. I can do it by individually processing them but is there any way where I can calculate the area statistics for each district polygon at a same time?

Answer 1

Use reduceRegions() instead of reduceRegion(). While reduceRegion() accepts a geometry and produces a dictionary of reducer outputs, reduceRegions() instead accepts a FeatureCollection and produces a FeatureCollection where each feature has the reducer outputs attached as properties.