Hello Simone and Michael,
Thank you very much for your interest.
I've tried to create a big TIFF (30000 x 28000 pixels) by using
DiskMemImage, but I was not fully successful.
The TIFF file was created, but all the pixels were set to 0 (which was
not my intention). I'm not sure if I was misusing DiskMemImage or
maybe it is not ready yet for such usage.
Some extra notes: the resulting TIFF file didn't have any compression,
despite I tried to set it to "Deflate".
Unfortunately I have other high priority tasks now, so I will no be
able to continue testing these classes for a while.
However I'll need both DiskMemImage and BigTiff support in my project,
so for sure I will come back to you when I have some time to spend on
this.
I paste my code bellow, because I think it may be useful for other
people interested in DiskMemImage.
Best regards,
César
-------- Sample code: ----
// I first decide if tiling must be used and which size must be used
(borrowed from ArcGridsImageReader),
//then I create the image, then I fill all the image with some useless
values, and finally try to create a coverage and write // this to disk
by using GeoTiffWriter.
/** Minimum size of a certain file source that neds tiling. */
final int MIN_SIZE_NEED_TILING = 5242880; // 5 MByte
/** Defaul tile size. */
final int DEFAULT_TILE_SIZE = 1048576 / 2; // 1 MByte
// if the imageSize is bigger than MIN_SIZE_NEED_TILING
// we proceed to image tiling
boolean isTiled = false;
/**
* Tile width for the underlying raster.
*/
int tileWidth = -1;
/**
* Tile height for the underlying raster.
*/
int tileHeight = -1;
/** Image Size */
long imageSize = -1;
try {
CoordinateReferenceSystem crs = CRS.decode("EPSG:3035");
int width = 30000, height = 28000;
int sampleSizeByte = DataBuffer.getDataTypeSize(DataBuffer.TYPE_FLOAT);
imageSize = (long)width * (long)height * (long)sampleSizeByte;
/**
* Setting Tile Dimensions (If Tiling is supported)
*/
// if the Image Size is greater than a certain dimension
// (MIN_SIZE_NEED_TILING), the image needs to be tiled
if (imageSize >= MIN_SIZE_NEED_TILING) {
isTiled = true;
// This implementation supposes that tileWidth is equal to the
width
// of the whole image
tileWidth = width;
// actually (need improvements) tileHeight is given by
// the default tile size divided by the tileWidth multiplied by
the
// sample size (in byte)
tileHeight = DEFAULT_TILE_SIZE / (tileWidth * sampleSizeByte);
// if computed tileHeight is zero, it is setted to 1 as
precaution
if (tileHeight < 1) {
tileHeight = 1;
}
} else {
// If no Tiling needed, I set the tile sizes equal to the image
// sizes
tileWidth = width;
tileHeight = height;
}
Envelope envelope = new Envelope2D(crs,
0, 0,
width, height);
ColorSpace cs = ColorSpaceJAI.getInstance(ColorSpaceJAI.CS_GRAY);
ComponentColorModelJAI cm = new ComponentColorModelJAI(cs, false,
false, ComponentColorModelJAI.OPAQUE, DataBuffer.TYPE_FLOAT);
int[] bandOffsets = new int[1];
bandOffsets[0] = 0;
ComponentSampleModelJAI sampleModel = new
ComponentSampleModelJAI(DataBuffer.TYPE_FLOAT, tileWidth, tileHeight,
1, tileWidth, bandOffsets);
DiskMemImage img = new DiskMemImage(width, height, sampleModel, cm);
for (int j=0, yTiles = img.getMaxTileY(); j<yTiles; j++) {
for (int i=0, xTiles = img.getMaxTileX(); i<xTiles; i++) {
WritableRaster tile = img.getWritableTile(i, j);
for (int jj=0, yMax=tile.getHeight(); jj<yMax; jj++) {
for (int ii=0, xMax=tile.getWidth(); ii<xMax;
ii++) {
tile.setSample(ii, jj, 0, i);
}
}
img.releaseWritableTile(i, j);
}
}
GridCoverageFactory factory =
CoverageFactoryFinder.getGridCoverageFactory(null);
GridCoverage2D gc = factory.create("bigtif", img, envelope);
GeoTiffFormat fmt = new GeoTiffFormat();
//getting the write parameters
final GeoTiffWriteParams wp = new GeoTiffWriteParams();
//setting compression to Deflate
wp.setCompressionMode(GeoTiffWriteParams.MODE_EXPLICIT);
wp.setCompressionType("Deflate");
wp.setCompressionQuality(0.75F);
//setting the tile size to 256X256
wp.setTilingMode(GeoToolsWriteParams.MODE_EXPLICIT);
wp.setTiling(256, 256);
//setting the write parameters for this geotiff
final ParameterValueGroup params = fmt.getWriteParameters();
params.parameter(
AbstractGridFormat.GEOTOOLS_WRITE_PARAMS.getName().toString())
.setValue(wp);
GridCoverageWriter writer = fmt.getWriter(m_sFilename);
writer.write(gc.geophysics(true), null);
writer.dispose();
} catch (Exception e) {
e.printStackTrace();
}
------- end of sampe code ---
El día 8 de noviembre de 2009 19:12, Simone Giannecchini
<[email protected]> escribió:
> Ciao Cesar,
> notice that a geotiff cannot be larger than 4gb. It is a format
> limitation not a geotools limitation.
> We have a student that is trying to extend imageio tiff plugin to
> support bigtiff as well, but for the moment no work should have been
> performed on writing bigtiff. If you are interested I can try to check
> with him next week.
>
> Ciao,
> Simone.
> -------------------------------------------------------
> Ing. Simone Giannecchini
> GeoSolutions S.A.S.
> Founder - Software Engineer
> Via Carignoni 51
> 55041 Camaiore (LU)
> Italy
>
> phone: +39 0584983027
> fax: +39 0584983027
> mob: +39 333 8128928
>
>
> http://www.geo-solutions.it
> http://geo-solutions.blogspot.com/
> http://simboss.blogspot.com/
> http://www.linkedin.com/in/simonegiannecchini
>
> -------------------------------------------------------
>
>
>
> 2009/10/30 César Martínez Izquierdo <[email protected]>:
>> Hello list,
>>
>> now that I've solved my problems *reading* big raster data, I'm also
>> trying to *write* them.
>> I've written some testing code:
>>
>> CoordinateReferenceSystem crs = CRS.decode(crsString);
>> Envelope envelope = new Envelope2D(crs, 0, 0, 60000, 60000);
>>
>> Raster m_Raster =
>> RasterFactory.createBandedRaster(DataBuffer.TYPE_FLOAT,
>> 60000, 60000, 1, null);
>>
>> GridCoverageFactory factory =
>> CoverageFactoryFinder.getGridCoverageFactory(null);
>>
>> GridCoverage2D gc = factory.create("bigtif",
>> (WritableRaster)m_Raster, envelope,
>> null, null, null, null, null);
>>
>> AbstractGridCoverageWriter writer = new GeoTiffWriter(m_sFilename);
>> writer.write(gc.geophysics(true), null);
>> writer.dispose();
>>
>> However, the method createBandedRaster fails (as I was expecting...):
>> java.lang.IllegalArgumentException: Size of array must be smaller
>> than Integer.MAX_VALUE.
>> at javax.media.jai.RasterFactory.createBandedRaster(RasterFactory.java:307)
>>
>> Is there a better way to achieve this?
>>
>> Regards,
>>
>>
>> César
>>
>>
>> --
>> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
>> César Martínez Izquierdo
>> GIS developer
>> - - - - - - - - - - - - - - - - - - - -
>> ETC-LUSI: http://etc-lusi.eionet.europa.eu/
>> Universitat Autònoma de Barcelona (SPAIN)
>> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
>>
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>
--
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César Martínez Izquierdo
GIS developer
- - - - - - - - - - - - - - - - - - - -
ETC-LUSI: http://etc-lusi.eionet.europa.eu/
Universitat Autònoma de Barcelona (SPAIN)
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