88 lines
2.2 KiB
Java
88 lines
2.2 KiB
Java
package btools.mapcreator;
|
|
|
|
import java.io.*;
|
|
import btools.util.*;
|
|
|
|
//
|
|
// Encode/decode a raster
|
|
//
|
|
|
|
public class RasterCoder
|
|
{
|
|
public void encodeRaster(SrtmRaster raster, OutputStream os) throws IOException
|
|
{
|
|
DataOutputStream dos = new DataOutputStream(os);
|
|
|
|
long t0 = System.currentTimeMillis();
|
|
|
|
dos.writeInt(raster.ncols);
|
|
dos.writeInt(raster.nrows);
|
|
dos.writeDouble(raster.xllcorner);
|
|
dos.writeDouble(raster.yllcorner);
|
|
dos.writeDouble(raster.cellsize);
|
|
dos.writeShort(raster.noDataValue);
|
|
|
|
_encodeRaster(raster, os);
|
|
long t1 = System.currentTimeMillis();
|
|
|
|
System.out.println("finished encoding in " + (t1 - t0) + " ms");
|
|
}
|
|
|
|
public SrtmRaster decodeRaster(InputStream is) throws IOException
|
|
{
|
|
DataInputStream dis = new DataInputStream(is);
|
|
|
|
long t0 = System.currentTimeMillis();
|
|
|
|
SrtmRaster raster = new SrtmRaster();
|
|
raster.ncols = dis.readInt();
|
|
raster.nrows = dis.readInt();
|
|
raster.xllcorner = dis.readDouble();
|
|
raster.yllcorner = dis.readDouble();
|
|
raster.cellsize = dis.readDouble();
|
|
raster.noDataValue = dis.readShort();
|
|
raster.eval_array = new short[raster.ncols * raster.nrows];
|
|
|
|
_decodeRaster(raster, is);
|
|
|
|
raster.usingWeights = true;
|
|
|
|
long t1 = System.currentTimeMillis();
|
|
System.out.println("finished decoding in " + (t1 - t0) + " ms");
|
|
return raster;
|
|
}
|
|
|
|
|
|
private void _encodeRaster(SrtmRaster raster, OutputStream os) throws IOException
|
|
{
|
|
MixCoderDataOutputStream mco = new MixCoderDataOutputStream(os);
|
|
int nrows = raster.nrows;
|
|
int ncols = raster.ncols;
|
|
short[] pixels = raster.eval_array;
|
|
|
|
for (int row = 0; row < nrows; row++)
|
|
{
|
|
for (int col = 0; col < ncols; col++)
|
|
{
|
|
mco.writeMixed(pixels[row * ncols + col]);
|
|
}
|
|
}
|
|
mco.flush();
|
|
}
|
|
|
|
private void _decodeRaster(SrtmRaster raster, InputStream is) throws IOException
|
|
{
|
|
MixCoderDataInputStream mci = new MixCoderDataInputStream(is);
|
|
int nrows = raster.nrows;
|
|
int ncols = raster.ncols;
|
|
short[] pixels = raster.eval_array;
|
|
|
|
for (int row = 0; row < nrows; row++)
|
|
{
|
|
for (int col = 0; col < ncols; col++)
|
|
{
|
|
pixels[row * ncols + col] = (short) mci.readMixed();
|
|
}
|
|
}
|
|
}
|
|
}
|