Update image geometry from another geometry (GEE)

Question

I have a set of images I have processed. Unfortunately, the geometry of the image processed do not always fit the image data.

Problem: Let's assume I have an imageCollection. Then, when I would like to filter by bounds according the green area (using filterBounds). The 'blue' image will be selected whereas I don't want (no data in the green area).

Illustration:

• blue is the image data
• dark the image geometry
• green is the region of interest

Question: Knowing the geometry where there is data (I know it from image before pre-processing), how can I refit the image geometry ?

My attempts:

• to update the property system:footprint with:

  image = image.set('system:footprint', mygeometry)
  

  But, then, when I call image.geometry(), the geometry hasn't been updated.

• clip function: the documentation clearly explains this is applying a mask, do not update the geometry.

Reproducibility: Link code

Answer 1

Your code is fine, it's doing what you need, but you are not watching right the results:

var image = imageCollection.first();
var bad_footprint = image.geometry()

Map.addLayer(image, imageVisParam, "Original Image");
Map.addLayer(image.geometry(), {}, "Image footprint (bad)");
Map.centerObject(image);

var original_image = ee.Image("COPERNICUS/S2/20180105T112439_20180105T112439_T30VVH");
var good_footprint = original_image.geometry()

// set footprint of image
var image_updated = image.set('system:footprint', good_footprint);
Map.addLayer(image_updated.geometry(), {}, "New Image footprint (good)");

https://code.earthengine.google.com/cb0f8ae5ae6193b2678a37f7ee2e8433