Sorry... there was a little bug in my posted code:
In the ASCII import routine the ArcGridRaster-constructor must be called with a
second parameter (boolean):
ArcGridRaster reader = new ArcGridRaster(
new InputStreamReader(input), false );
> -----Ursprüngliche Nachricht-----
> Von: Martin Schmitz <[EMAIL PROTECTED]>
> Gesendet: 17.11.06 16:32:47
> An: [email protected]
> Betreff: Re: [Geotools-gt2-users] working with rasters
> Hello,
>
> I did not work with ESRI or ERDAS grids yet, but the following code segments
> should work for ASCII and GeoTiff (using GT2.2.0):
>
> Importing ASCII-Grids
> ===============
> import java.io.InputStream;
> import java.io.InputStreamReader;
> import java.awt.geom.Rectangle2D;
> import java.awt.image.WritableRaster;
> import org.geotools.gce.arcgrid.ArcGridRaster;
> import org.geotools.geometry.Envelope2D;
> import org.geotools.coverage.grid.GridCoverage2D;
> import org.geotools.coverage.grid.GridCoverageFactory;
> ...
> InputStream input = ...;
> ArcGridRaster reader = new ArcGridRaster(
> new InputStreamReader(input) );
> WritableRaster raster = reader.readRaster();
> float x = (float)reader.getXlCorner(); // South West
> float y = (float)reader.getYlCorner(); // South West
> float w = (float)(reader.getNCols() * reader.getCellSize());
> float h = (float)(reader.getNRows() * reader.getCellSize());
> Envelope2D envelope = new Envelope2D(null,
> new Rectangle2D.Float(x,y,w,h));
> GridCoverage2D grid = new GridCoverageFactory().create(
> "My Grid", raster, envelope);
>
>
> Importing GeoTiff-Grids
> ================
> import java.io.File;
> import org.geotools.gce.geotiff.GeoTiffFormat;
> import org.geotools.coverage.grid.GridCoverage2D;
> ...
> File input = ...;
> GeoTiffFormat format = new GeoTiffFormat();
> GridCoverage2D grid =
> (GridCoverage2D)format.getReader(input).read(null);
>
>
> With kind regards...
>
> Martin Schmitz
>
>
> > -----Ursprüngliche Nachricht-----
> > Von: "Hari S. Khalsa" <[EMAIL PROTECTED]>
> > Gesendet: 17.11.06 15:33:33
> > An: [email protected]
> > Betreff: [Geotools-gt2-users] working with rasters
>
>
> > Hi All,
> >
> > This is my first post to these forums. I'm currently having an issue
> > relating to working with rasters in Geotools. However, before I describe
> > it, I was wondering if anyone here could give me some general help. I've
> > been working with Geotools for a couple of months now but I've just used it
> > for it's shapefile reading/writing ability and the JTS geometry
> > functionality. All this time, I've been somewhat confused by the
> > organization of the web site and all Geotools resources in general. I even
> > find this user forum hard to read as it seems that the spacings and
> > carriage returns get messed up in replies to people's questions. Where is
> > the best place to find help using Geotools? Is it this forum? Is there a
> > Developer's Guide somewhere because the link on the website to a developers
> > guide brings up a 404 error
> > (http://geotools.codehaus.org/display/GEOT/Home)?
> >
> > Currently I'm trying to read in an ERDAS imagine file. I don't think there
> > is any support for this in Geotools, but I haven't been able to make a
> > definitive determination on this. I converted the ERDAS file into the ESRI
> > raster format and then into ASCII text hoping to follow the example given
> > on the following webpage
> > http://geotools.codehaus.org/Using+Grid+Coverage+Exchange
> >
> > Unfortunately this example does not work. Can anyone provide me with a
> > method for reading in a raster in any of the three aforementioned formats
> > (ESRI, ERDAS, or ASCII)? I don't even have a GUI on my code, my ultimate
> > goal is to simply determine the underlying raster values below a vector
> > polygon. I'm sure I'll have issues with projections later, but for now I
> > just want to be able to read in the raster data.
> >
> > Thanks,
> > Hari
> >
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