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I want to download a clipped version of image with getDownloadURL(), but the result only maintains the bounds of clip polygon, not the shape itself.

This is an example script:

var no2_coll = ee.ImageCollection("COPERNICUS/S5P/OFFL/L3_NO2");

// irregularly shaped polygon
var aoi = ee.Geometry.Polygon([[[36.19717602142744, 36.235397497040246], [35.03262524017744, 34.38876424418324],
[39.17447094330244, 34.37062991132883], [39.41617016205244, 36.36820725445314], [38.17471508392744, 35.3890351383359]]]);

var image = no2_coll.select("tropospheric_NO2_column_number_density")
  .filterBounds(aoi).first();


// this clips an image, but has no effect on result of .getDownloadURL()
var img_clip = image.clip(aoi);

// this has effect on result of .getDownloadURL()
var img_clip_double_mask = img_clip.mask(img_clip.mask());

var downloadArgs = {
  name: 'expected_clipped_image',
  crs: image.projection(),
  scale: 7000,
  region: aoi
};

var url = img_clip_double_mask.getDownloadURL(downloadArgs);

print(url);

So while both img_clip and img_clip_double_mask are rendered as a clipped image on Map, it is only when you change img_clip to img_clip_double_mask (essentially self masking - but seems redundant) when you get clipped image from .getDownloadURL().

Why is that?

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