/**
* description: the following TIFFKeys count as indicator if a TIFF-File carries GeoTIFF
* information: <br>
* ModelPixelScaleTag = 33550 (SoftDesk) <br>
* ModelTransformationTag = 34264 (JPL Carto Group) <br>
* ModelTiepointTag = 33922 (Intergraph) <br>
* GeoKeyDirectoryTag = 34735 (SPOT) <br>
* GeoDoubleParamsTag = 34736 (SPOT) <br>
* GeoAsciiParamsTag = 34737 (SPOT)
*/
private boolean isGeoTiff(TIFFImage image) {
TIFFDirectory directory = (TIFFDirectory) image.getProperty("tiff_directory");
if (directory.getField(GeoTiffTag.ModelPixelScaleTag) == null
&& directory.getField(GeoTiffTag.ModelTransformationTag) == null
&& directory.getField(GeoTiffTag.ModelTiepointTag) == null
&& directory.getField(GeoTiffTag.GeoKeyDirectoryTag) == null
&& directory.getField(GeoTiffTag.GeoDoubleParamsTag) == null
&& directory.getField(GeoTiffTag.GeoAsciiParamsTag) == null) {
return false;
}
return true;
}
/**
* @return the bbox
* @throws GeoTiffException
*/
public Envelope getBoundingBox() throws GeoTiffException {
TIFFField modelPixelScaleTag = this.tifdir.getField(GeoTiffTag.ModelPixelScaleTag);
double resx = modelPixelScaleTag.getAsDouble(0);
double resy = modelPixelScaleTag.getAsDouble(1);
TIFFField modelTiepointTag = this.tifdir.getField(GeoTiffTag.ModelTiepointTag);
double val1 = 0.0;
val1 = modelTiepointTag.getAsDouble(0);
double val2 = 0.0;
val2 = modelTiepointTag.getAsDouble(1);
double val4 = 0.0;
val4 = modelTiepointTag.getAsDouble(3);
double val5 = 0.0;
val5 = modelTiepointTag.getAsDouble(4);
if ((resx == 0.0 || resy == 0.0)
|| (val1 == 0.0 && val2 == 0.0 && val4 == 0.0 && val5 == 0.0)) {
throw new GeoTiffException("The image/coverage hasn't a bounding box");
// set the geoparams derived by geoTiffTags
}
// upper/left pixel
double xOrigin = val4 - (val1 * resx);
double yOrigin = val5 - (val2 * resy);
// lower/right pixel
double xRight = xOrigin + image.getWidth() * resx;
double yBottom = yOrigin - image.getHeight() * resy;
double xmin = xOrigin;
double ymin = yBottom;
double xmax = xRight;
double ymax = yOrigin;
Envelope envelope = geometryFactory.createEnvelope(xmin, ymin, xmax, ymax, null);
return envelope;
}
/**
* @param file
* @throws FileNotFoundException
* @throws IOException
* @throws GeoTiffException
*/
public GeoTiffReader(File file) throws FileNotFoundException, IOException, GeoTiffException {
TIFFDecodeParam decodeParam = new TIFFDecodeParam();
int geodirectory = 0;
FileInputStream fis = new FileInputStream(file);
FileCacheSeekableStream fcss = new FileCacheSeekableStream(fis);
this.image = new TIFFImage(fcss, decodeParam, geodirectory);
if (!isGeoTiff(this.image)) {
throw new GeoTiffException("GeoTiffReader: TIFF is no GeoTIFF image!");
}
this.tifdir = (TIFFDirectory) image.getProperty("tiff_directory");
if (this.tifdir.getField(GeoTiffTag.GeoKeyDirectoryTag) != null) {
setGeoKeyDirectoryTag();
}
fcss.close();
}
