private void writeGeographicElevationGeoKeys(ArrayList<TiffIFDEntry> ifds, AVList params)
throws IOException {
long offset = this.theChannel.position();
if (isElevation(params) && isGeographic(params)) {
int epsg = GeoTiff.GCS.WGS_84;
if (params.hasKey(AVKey.PROJECTION_EPSG_CODE))
epsg = (Integer) params.getValue(AVKey.PROJECTION_EPSG_CODE);
int elevUnits = GeoTiff.Unit.Linear.Meter;
if (params.hasKey(AVKey.ELEVATION_UNIT)) {
if (AVKey.UNIT_FOOT.equals(params.getValue(AVKey.ELEVATION_UNIT)))
elevUnits = GeoTiff.Unit.Linear.Foot;
}
int rasterType = GeoTiff.RasterType.RasterPixelIsArea;
if (params.hasKey(AVKey.RASTER_PIXEL)
&& AVKey.RASTER_PIXEL_IS_POINT.equals(params.getValue(AVKey.RASTER_PIXEL)))
rasterType = GeoTiff.RasterType.RasterPixelIsPoint;
short[] values =
new short[] {
// GeoKeyDirectory header
GeoTiff.GeoKeyHeader.KeyDirectoryVersion,
GeoTiff.GeoKeyHeader.KeyRevision,
GeoTiff.GeoKeyHeader.MinorRevision,
0, // IMPORTANT!! we will update count below, after the array initialization
// end of header -
// geo keys array
/* key 1 */
GeoTiff.GeoKey.ModelType,
0,
1,
GeoTiff.ModelType.Geographic,
/* key 2 */
// TODO: Replace GeoTiff.RasterType.RasterPixelIsPoint
GeoTiff.GeoKey.RasterType,
0,
1,
(short) (0xFFFF & rasterType),
/* key 3 */
GeoTiff.GeoKey.GeographicType,
0,
1,
(short) (0xFFFF & epsg),
/* key 4 */
GeoTiff.GeoKey.GeogAngularUnits,
0,
1,
GeoTiff.Unit.Angular.Angular_Degree,
/* key 5 */
GeoTiff.GeoKey.VerticalCSType,
0,
1,
GeoTiff.VCS.WGS_84_ellipsoid,
/* key 6 */
GeoTiff.GeoKey.VerticalUnits,
0,
1,
(short) (0xFFFF & elevUnits),
};
// IMPORTANT!! update count - number of geokeys
values[3] = (short) (values.length / 4);
byte[] bytes = this.getBytes(values);
this.theChannel.write(ByteBuffer.wrap(bytes));
ifds.add(
new TiffIFDEntry(GeoTiff.Tag.GEO_KEY_DIRECTORY, Tiff.Type.SHORT, values.length, offset));
}
}
