[udig-devel] Udig problem reading sample values of geotiff

["Pasquale Paola" <pasquale.paola@xxxxxx>]

I'm reading the sample values of geotiff with this simple code:

public static void main(String[] args)

{

try

{

 

System.out

.println(java.nio.charset.Charset.defaultCharset().name());

// System.exit(0);

// Set the default locale to pre-defined locale

// Locale.setDefault(new Locale("en", "US"));

BufferedImage image = ImageIO.read(new File(

"C:\\aaa\\combustibile.tif"));

Raster rr = image.getRaster();

int[] bandOffsets = new int[rr.getNumBands()];

int dd = rr.getSampleModel().getDataType();

for (int z = 0; z < rr.getSampleModel().getNumBands(); z++)

for (int i = 0; i < rr.getWidth(); i++)

for (int j = 0; j < rr.getHeight(); j++)

{

String sample = getSample(i, j, z, dd, rr);

System.out.println("Sample value " + sample);

}

} catch (IOException ex)

{

ex.printStackTrace();

}

}

 

 

private static String getSample(int i, int j, int z, int type,

final Raster raster)

{

String result = "";

try

{

switch (type)

{

case TIFFTag.TIFF_BYTE:

result = "" + raster.getSample(i, j, z);

break;

case TIFFTag.TIFF_UINT32:

result = "" + raster.getSample(i, j, z);

break;

case TIFFTag.TIFF_FOLAT32:

result = "" + raster.getSampleFloat(i, j, z);

break;

case TIFFTag.TIFF_INT16:

result = "" + raster.getSample(i, j, z);

break;

case TIFFTag.TIFF_UINT16:

result = "" + raster.getSample(i, j, z);

break;

default:

break;

}

} catch (IllegalArgumentException a)

{

a.printStackTrace();

throw a;

} catch (ClassCastException e)

{

e.printStackTrace();

throw e;

}

return result;

}

 

and I obtain the correct values for example 4.0

 

When I change the raster image read on filesystem, with the rendered image obtained by udig raster layer, I obtain different values. For example in the pixel with value 4.0 I found 1.512366E38.

Where is the problem?

How can I solve it?

 

Cheers

Pasquale Paola

....................................................................................................
Pasquale Paola
Engineering Ingegneria Informatica S.p.a.
Direzione: Ricerca ed Innovazione
Via Terragneta, 90
80058 Torre Annunziata (NA)
Tel. +39.081.862.68.21
Fax +39.081.862.68.19
e-mail:pasquale.paola@xxxxxx
http://www.linkedin.com/in/pasqualepaola  

 

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