GEE Classification Error Multiple Geometry types

Question

I came to the issue of Out of Memory Error when I tried to do a supervised classification of an image using a shapefile polygons as underlying featureCollection in GEE. It turned out that some of the polygons that I used for sampling the underlying pixels are due to some reason not of "polygon" type but of "GeometryCollection" type (mostly combination of polygon and LineString). I wonder if it is possible to correct these non-polygons and correct their geometry type into "polygon" without producing other side effects?

Please see the attached image of one 'bad' geometry example. This should be a "Polygon" but it has a sliver in it which turned the polygon into "GeometryCollection" consisting of a 'Polygon' + 'LineString'. Unfortunately about one-third of my featureCollection is populated with such geometries! I need to somehow get rid of these artifacts.

Answer 1

You can get the polygon within the GeometryCollection using (if there is one):

var list = geometryCollection.geometries().filter(ee.Filter.hasType('item','Polygon'))
var polygon = ee.Geometry.Polygon(ee.Geometry(list.get(0)).coordinates())

or a multi polygon if the collection has multiple polygons:

var list = geometryCollection.geometries().filter(ee.Filter.hasType('item','Polygon'))
var multiPolygon = ee.Geometry.MultiPolygon(list)