GEE: masking for multiple pixel values

Question

The GEE tutorial shows how to mask an image for one pixel value using .eq(pixel value).

However, I want to mask all pixels in an image with a value of 15 or less in this dataset

var riverflow = ee.Image('WWF/HydroSHEDS/15ACC');

var flowAccumulation = riverflow.select('b1');

And now I need to use .updateMask. This must be very straightforward right?

Answer 1

If you want to keep pixels that have a value of 15 or less than 15 and mask the rest of the pixels:

var riverflow = ee.Image('WWF/HydroSHEDS/15ACC');

var flowAccumulation = riverflow.select('b1');
//Map.addLayer(flowAccumulation)

var masked = flowAccumulation.updateMask(flowAccumulation.lte(15)); 
//Map.addLayer(masked)

On the other hand, If you want to mask the pixels that have a value of 15 or less than 15 and keep the rest of the pixels:

var riverflow = ee.Image('WWF/HydroSHEDS/15ACC');

var flowAccumulation = riverflow.select('b1');
//Map.addLayer(flowAccumulation)

var masked = flowAccumulation.updateMask(flowAccumulation.gte(15)); 
//Map.addLayer(masked)

Hope it helps.