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change hgt to ConvertLidarTile

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This commit is contained in:
afischerdev 2023-05-08 16:18:24 +02:00
parent 580b7b2421
commit a2c5ed68fc
2 changed files with 167 additions and 28 deletions
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126
brouter-map-creator/src/main/java/btools/mapcreator/ConvertLidarTile.java
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@ -14,10 +14,14 @@ import java.util.zip.ZipInputStream;
public class ConvertLidarTile {
public static int NROWS;
public static int NCOLS;
public static int ROW_LENGTH;
public static final short NODATA2 = -32767; // hgt-formats nodata
public static final short NODATA = Short.MIN_VALUE;
public static final int SRTM3_ROW_LENGTH = 1200; // number of elevation values per line
public static final int SRTM1_ROW_LENGTH = 3600; //-- New file resolution is 3601x3601
static short[] imagePixels;
private static void readHgtZip(String filename, int rowOffset, int colOffset) throws Exception {
@ -26,7 +30,7 @@ public class ConvertLidarTile {
for (; ; ) {
ZipEntry ze = zis.getNextEntry();
if (ze.getName().endsWith(".hgt")) {
readHgtFromStream(zis, rowOffset, colOffset);
readHgtFromStream(zis, rowOffset, colOffset, 1200);
return;
}
}
@ -35,13 +39,40 @@ public class ConvertLidarTile {
}
}
private static void readHgtFromStream(InputStream is, int rowOffset, int colOffset)
private static void readHgtFromStream(InputStream is, int rowOffset, int colOffset, int row_length)
throws Exception {
DataInputStream dis = new DataInputStream(new BufferedInputStream(is));
for (int ir = 0; ir < 1201; ir++) {
for (int ir = 0; ir < row_length + 1; ir++) {
int row = rowOffset + ir;
for (int ic = 0; ic < 1201; ic++) {
for (int ic = 0; ic < row_length + 1; ic++) {
int col = colOffset + ic;
int i1 = dis.read(); // msb first!
int i0 = dis.read();
if (i0 == -1 || i1 == -1)
throw new RuntimeException("unexcepted end of file reading hgt entry!");
short val = (short) ((i1 << 8) | i0);
if (val == NODATA2) {
val = NODATA;
}
setPixel(row, col, val);
}
}
}
private static void readHgtFromFile(File f, int rowOffset, int colOffset)
throws Exception {
DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(f)));
for (int ir = 0; ir < ROW_LENGTH + 1; ir++) {
int row = rowOffset + ir;
for (int ic = 0; ic < ROW_LENGTH + 1; ic++) {
int col = colOffset + ic;
int i1 = dis.read(); // msb first!
@ -186,4 +217,91 @@ public class ConvertLidarTile {
doConvert(args[1], ilon_base, ilat_base, filename30);
}
public SrtmRaster getRasterDirect(File f, double lon, double lat) throws Exception {
if (f.length() > ((SRTM3_ROW_LENGTH + 1) * (SRTM3_ROW_LENGTH + 1) * 2)) {
ROW_LENGTH = SRTM1_ROW_LENGTH;
} else {
ROW_LENGTH = SRTM3_ROW_LENGTH;
}
System.out.println("read file " + f + " rl " + ROW_LENGTH);
// stay a 1x1 raster
NROWS = ROW_LENGTH + 1;
NCOLS = ROW_LENGTH + 1;
imagePixels = new short[NROWS * NCOLS]; // 650 MB !
// prefill as NODATA
for (int row = 0; row < NROWS; row++) {
for (int col = 0; col < NCOLS; col++) {
imagePixels[row * NCOLS + col] = NODATA;
}
}
readHgtFromFile(f, 0, 0);
boolean halfCol5 = false; // no halfcol tiles in lidar data (?)
SrtmRaster raster = new SrtmRaster();
raster.nrows = NROWS;
raster.ncols = NCOLS;
raster.halfcol = halfCol5;
raster.noDataValue = NODATA;
raster.cellsize = 1. / (double) ROW_LENGTH;
raster.xllcorner = (int) (lon < 0 ? lon - 1 : lon); //onDegreeStart - raster.cellsize;
raster.yllcorner = (int) (lat < 0 ? lat - 1 : lat); //latDegreeStart - raster.cellsize;
raster.eval_array = imagePixels;
return raster;
}
public SrtmRaster getRasterZip(File f, double lon, double lat) throws Exception {
ZipInputStream zis = new ZipInputStream(new BufferedInputStream(new FileInputStream(f)));
try {
for (; ; ) {
ZipEntry ze = zis.getNextEntry();
if (ze.getName().toLowerCase().endsWith(".hgt")) {
if (ze.getSize() > ((SRTM3_ROW_LENGTH + 1) * (SRTM3_ROW_LENGTH + 1) * 2)) {
ROW_LENGTH = SRTM1_ROW_LENGTH;
} else {
ROW_LENGTH = SRTM3_ROW_LENGTH;
}
System.out.println("read file " + f + " rl " + ROW_LENGTH);
// stay a 1x1 raster
NROWS = ROW_LENGTH + 1;
NCOLS = ROW_LENGTH + 1;
imagePixels = new short[NROWS * NCOLS]; // 650 MB !
// prefill as NODATA
for (int row = 0; row < NROWS; row++) {
for (int col = 0; col < NCOLS; col++) {
imagePixels[row * NCOLS + col] = NODATA;
}
}
readHgtFromStream(zis, 0, 0, ROW_LENGTH);
break;
}
}
} finally {
zis.close();
}
boolean halfCol5 = false; // no halfcol tiles in lidar data (?)
SrtmRaster raster = new SrtmRaster();
raster.nrows = NROWS;
raster.ncols = NCOLS;
raster.halfcol = halfCol5;
raster.noDataValue = NODATA;
raster.cellsize = 1. / (double) ROW_LENGTH;
raster.xllcorner = (int) (lon < 0 ? lon - 1 : lon); //onDegreeStart - raster.cellsize;
raster.yllcorner = (int) (lat < 0 ? lat - 1 : lat); //latDegreeStart - raster.cellsize;
raster.eval_array = imagePixels;
return raster;
}
}