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Deduplicate code

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This commit is contained in:
Manuel Fuhr 2023-05-15 14:30:28 +02:00
parent 8c6be04228
commit 7c184a03f9
1 changed files with 45 additions and 65 deletions
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110
brouter-map-creator/src/main/java/btools/mapcreator/ConvertLidarTile.java
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@ -5,22 +5,25 @@ import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class ConvertLidarTile {
public static int NROWS;
public static int NCOLS;
public static int ROW_LENGTH;
private static int NROWS;
private static int NCOLS;
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
private static final int SRTM_BORDER_OVERLAP = 1;
private static final int SRTM3_ROW_LENGTH = 1201; // 3 arc second resolution (90m)
private static final int SRTM3_FILE_SIZE = SRTM3_ROW_LENGTH * SRTM3_ROW_LENGTH * Short.BYTES;
private static final int SRTM1_ROW_LENGTH = 3601; // 1 arc second resolution (30m)
static short[] imagePixels;
@ -31,7 +34,7 @@ public class ConvertLidarTile {
ZipEntry ze = zis.getNextEntry();
if (ze == null) break;
if (ze.getName().endsWith(".hgt")) {
readHgtFromStream(zis, rowOffset, colOffset, 1200);
readHgtFromStream(zis, rowOffset, colOffset, SRTM3_ROW_LENGTH);
return;
}
}
@ -40,13 +43,13 @@ public class ConvertLidarTile {
}
}
private static void readHgtFromStream(InputStream is, int rowOffset, int colOffset, int row_length)
private static void readHgtFromStream(InputStream is, int rowOffset, int colOffset, int rowLength)
throws Exception {
DataInputStream dis = new DataInputStream(new BufferedInputStream(is));
for (int ir = 0; ir < row_length + 1; ir++) {
for (int ir = 0; ir < rowLength; ir++) {
int row = rowOffset + ir;
for (int ic = 0; ic < row_length + 1; ic++) {
for (int ic = 0; ic < rowLength; ic++) {
int col = colOffset + ic;
int i1 = dis.read(); // msb first!
@ -191,80 +194,57 @@ public class ConvertLidarTile {
}
public SrtmRaster getRaster(File f, double lon, double lat) throws Exception {
long fileSize;
InputStream inputStream;
if (f.getName().toLowerCase().endsWith(".zip")) {
String HGT_FILE_EXT = ".hgt";
ZipInputStream zis = new ZipInputStream(new BufferedInputStream(new FileInputStream(f)));
try {
for (; ; ) {
ZipEntry ze = zis.getNextEntry();
if (ze == null) break;
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;
}
// 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;
}
for (; ; ) {
ZipEntry ze = zis.getNextEntry();
if (ze == null) {
throw new FileNotFoundException(f.getName() + " doesn't contain a " + HGT_FILE_EXT + " file.");
}
if (ze.getName().toLowerCase().endsWith(HGT_FILE_EXT)) {
fileSize = ze.getSize();
inputStream = zis;
break;
}
} finally {
zis.close();
}
} else {
if (f.length() > ((SRTM3_ROW_LENGTH + 1) * (SRTM3_ROW_LENGTH + 1) * 2)) {
ROW_LENGTH = SRTM1_ROW_LENGTH;
} else {
ROW_LENGTH = SRTM3_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;
}
}
FileInputStream dis = new FileInputStream(f);
try {
readHgtFromStream(dis, 0, 0, ROW_LENGTH);
} finally {
dis.close();
}
fileSize = f.length();
inputStream = new FileInputStream(f);
}
System.out.println("read file " + f + " rl " + ROW_LENGTH);
boolean halfCol5 = false; // no halfcol tiles in lidar data (?)
int rowLength;
if (fileSize > SRTM3_FILE_SIZE) {
rowLength = SRTM1_ROW_LENGTH;
} else {
rowLength = SRTM3_ROW_LENGTH;
}
// stay at 1 deg * 1 deg raster
NROWS = rowLength;
NCOLS = rowLength;
imagePixels = new short[NROWS * NCOLS];
// prefill as NODATA
Arrays.fill(imagePixels, NODATA);
readHgtFromStream(inputStream, 0, 0, rowLength);
inputStream.close();
SrtmRaster raster = new SrtmRaster();
raster.nrows = NROWS;
raster.ncols = NCOLS;
raster.halfcol = halfCol5;
raster.halfcol = false; // assume full resolution
raster.noDataValue = NODATA;
raster.cellsize = 1. / (double) ROW_LENGTH;
raster.cellsize = 1. / (double) (rowLength - SRTM_BORDER_OVERLAP);
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;
}
}