[Attention] Pyramiding policy bug could have affected image asset exports between Oct 6 and 20

[Google Earth Engine Announcements]

Dear Earth Engine developers,

If you don't export data to raster assets or if you don't use the pyramidingPolicy export parameter, you can stop reading now.

Between Oct 6 and Oct 20, EE had a bug that caused the values of pyramidingPolicy to be dropped during exports to assets. This parameter is typically used when you export categorical data like land classes or bitmasked QA bands. When it was dropped, the resulting asset would have the default pyramiding policy MEAN for all bands, which would cause computations using this asset at non-native scales to return incorrect values.

If this affected your assets, you would need to reexport them.

You can examine asset pyramiding policy with the 'earthengine asset info' command. Example:

earthengine asset info NASA/NASADEM_HGT/001
...
{
  "bands": [
    {
      "id": "elevation",
      "pyramidingPolicy": "MEAN"
    },
{
  "id": "num",
  "pyramidingPolicy": "MODE"
  ...
},

We apologize for introducing the bug.

Best,
Earth Engine team