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Returns the union of the geometry. This leaves single geometries untouched, and unions multi geometries.

MultiPolygon.dissolve(maxError, proj)Geometry
this: geometryGeometryThe geometry to union.
maxErrorErrorMargin, default: nullThe maximum amount of error tolerated when performing any necessary reprojection.
projProjection, default: nullIf specified, the union will be performed in this projection. Otherwise it will be performed in a spherical coordinate system.


Code Editor (JavaScript)

// Define a MultiPolygon object.
var multiPolygon = ee.Geometry.MultiPolygon(
    [[[[-122.092, 37.424],
       [-122.086, 37.418],
       [-122.079, 37.425],
       [-122.085, 37.423]]],
     [[[-122.081, 37.417],
       [-122.086, 37.421],
       [-122.089, 37.416]]]]);

// Apply the dissolve method to the MultiPolygon object.
var multiPolygonDissolve = multiPolygon.dissolve({'maxError': 1});

// Print the result to the console.
print('multiPolygon.dissolve(...) =', multiPolygonDissolve);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
             {'color': 'black'},
             'Geometry [black]: multiPolygon');
             {'color': 'red'},
             'Result [red]: multiPolygon.dissolve');