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I am a newbie and following the GEE tutorial at this link:

https://developers.google.com/earth-engine/tutorials/tutorial_api_05

I do not understand the following line of code under the section of Mosaicking:

// Mask water with itself to mask all the zeros (non-water).
water = water.mask(water);

The water variable on the right hand side of the assignment is a mask that has value 1 for water and 0 for non-water.

Don't you get the exact same mask when applying it to itself? I am completely confused by the above statement.

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The image's mask is separate from the numerical value. If the mask is 1 (unmasked), the value can still be 0 or 1 (or anything else). Self-masking causes all the 0 values in the image to become masked (no value) instead of 0.

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