Mask a raster image with classified image class mask

google-earth-enginegoogle-earth-engine-javascript-apisentinel-2

I have classified an image having a class by the name lights. It has value equal to zero. I select the mask by using

var lights_mask = classified_image.eq(0).selfMask(); //binary mask

Now I want to subtract the original image from this raster mask.
I have used both methods

var masked_image = image.updateMask(lights_mask);
//or
//var masked_image = image.subtract(lights_mask);

But it returns the original image with masked portion only. I want the mask portion to be removed and the rest of the multi-band image remains the same.

Simple put I want to clip a raster using a raster binary mask

Best Answer

I think you want .selfMask().mask().

Related Solutions

Eliminate isolated pixels in Google Earth Engine classified image

Just use a focal operator or reduceNeighborhood with a mode reducer.

image.focalMode(3)

image.reduceNeighborhood(ee.Reducer.mode(), ee.Kernel.circle(1))

Mask Sentinel-2 image using SCL product in Google Earth Engine

You just need to indicate which values from the SCL band you are interested in and the apply that mask to each image. Although you can indicate the values one by one, it is easier to use and and or with lt (less than) or gt (greater than) operators to select the desired SCL values.

var s2_clear_sky = function(image){
  // 1.Locate SCL product
  var scl = image.select('SCL');
  
  // 2.Apply mask to the image
  // Select values: 1) greater than 3 and less than 7 or 2) equal to 11
  var wantedPixels = scl.gt(3).and(scl.lt(7))
                              .or(scl.eq(11));
  return image.updateMask(wantedPixels);
};

Best Answer

Related Solutions

Eliminate isolated pixels in Google Earth Engine classified image

Mask Sentinel-2 image using SCL product in Google Earth Engine

Related Question