Get/extract value of a band in an image

Question

I have an ImageCollection where each image in it has only 1 band called sum. I would like to extract the value of the band and get a list of numbers. How can I do that? If the image is called im then im.get('sum') would not work.

Link to code: https://code.earthengine.google.com/bff236f76a14eba924d0ed8fcf670619

Answer 1

To get a list of pixel values from an image, you reduceRegion() with an ee.Reducer.toList() reducer:

var region = ee.Geometry.Point([0, 0]).buffer(90).bounds()
var image = ee.Image.random().rename('sum')

var values = ee.List(image
  .reduceRegion({
    reducer: ee.Reducer.toList(), 
    geometry: region, 
    scale: 30
  })
  .get('sum')
)

print(values)
Map.addLayer(image.clip(region).reproject('EPSG:4326', null, 30))
Map.centerObject(region)

https://code.earthengine.google.com/2dc8162bc6ec2d4591dfce31fdd09a36