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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