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srtm-update

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This commit is contained in:
Arndt 2016-08-05 16:03:03 +02:00
parent d277db0bd1
commit 19fd3112bf
6 changed files with 845 additions and 136 deletions
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88
brouter-map-creator/src/main/java/btools/mapcreator/RasterCoder.java Normal file
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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();
}
}
}
}