public int MaximumScale {get;}

{
  var levelCount = terrainDataset.GetPyramidLevelCount();
  IReadOnlyList<ArcGIS.Core.Data.Analyst3D.TerrainPyramidLevel> pyramidLevels = terrainDataset.GetPyramidLevels();
  foreach (var pyramidLevel in pyramidLevels)
  {
    var resolution = pyramidLevel.Resolution;
    var maxScale = pyramidLevel.MaximumScale;
  }
}