CustomGeoTiffRasterLayer geoTiff = new CustomGeoTiffRasterLayer(tiffFilePath);
            geoTiff.UpperThreshold = double.MaxValue;
            geoTiff.LowerThreshold = 0;
            geoTiff.Open();
            bool hasProj = geoTiff.HasProjectionText;



    public class CustomGeoTiffRasterSource : GeoTiffRasterSource
    {
        public CustomGeoTiffRasterSource(string imagePathFilename)
            : this(imagePathFilename, string.Empty)
        {
        }

        public CustomGeoTiffRasterSource(string imagePathFilename, string worldfilePathFilename)
            : base(imagePathFilename, worldfilePathFilename)
        {
        }

        public CustomGeoTiffRasterSource(string imagePathFilename, RectangleShape imageExtent)
            : base(imagePathFilename, imageExtent)
        {
        }

        protected override bool HasProjectionTextCore
        {
            get
            {
                return true;
            }
        }

        protected override string GetProjectionTextCore()
        {
            string sFilePath = this.PathFilename;

            //var proj4String = new StringBuilder(2048);
            //GeoTiffHelper.GeoTiffWrapper.GetGeoTiffProj4String(sFilePath, proj4String, 2048);
            return base.GetProjectionTextCore();
        }
    }

    public class CustomGeoTiffRasterLayer : RasterLayer
    {
        private DrawingQuality drawingQuality;
        public CustomGeoTiffRasterLayer()
            : this(string.Empty, string.Empty)
        {
        }
        public CustomGeoTiffRasterLayer(string imagePathFilename)
            : this(imagePathFilename, string.Empty)
        {
        }
        public CustomGeoTiffRasterLayer(string imagePathFilename, string worldfilePathFilename)
            : base()
        {
            ImageSource = new CustomGeoTiffRasterSource(imagePathFilename, worldfilePathFilename);
            ((GeoTiffRasterSource)ImageSource).PathFilename = imagePathFilename;
        }
        public CustomGeoTiffRasterLayer(string imagePathFilename, RectangleShape imageExtent)
            : base()
        {
            ImageSource = new CustomGeoTiffRasterSource(imagePathFilename, imageExtent);
            ((GeoTiffRasterSource)ImageSource).PathFilename = imagePathFilename;
        }

        public GeoTiffLibraryType LibraryType
        {
            get { return ((GeoTiffRasterSource)ImageSource).LibraryType; }
            set { ((GeoTiffRasterSource)ImageSource).LibraryType = value; }
        }
        public override bool HasBoundingBox
        {
            get
            {
                bool hasBoundingBox = false;
                try
                {
                    if (!ImageSource.IsOpen)
                    {
                        ImageSource.Open();
                    }
                    ImageSource.GetBoundingBox();
                    hasBoundingBox = true;
                }
                catch
                {
                    hasBoundingBox = false;
                }

                return hasBoundingBox;
            }
        }

        public DrawingQuality DrawingQuality
        {
            get { return drawingQuality; }
            set { drawingQuality = value; }
        }
        public string PathFilename
        {
            get { return ((GeoTiffRasterSource)ImageSource).PathFilename; }
            set { ((GeoTiffRasterSource)ImageSource).PathFilename = value; }
        }

        protected override void DrawCore(GeoCanvas canvas, System.Collections.ObjectModel.Collection<SimpleCandidate> labelsInAllLayers)
        {
            canvas.DrawingQuality = this.DrawingQuality;
            base.DrawCore(canvas, labelsInAllLayers);
        }
    }