251 lines
7.5 KiB
Java
251 lines
7.5 KiB
Java
package btools.mapcreator;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.DataInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.util.Arrays;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipInputStream;
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public class ConvertLidarTile {
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private static int NROWS;
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private static int NCOLS;
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public static final short NODATA2 = -32767; // hgt-formats nodata
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public static final short NODATA = Short.MIN_VALUE;
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private static final int SRTM_BORDER_OVERLAP = 1;
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private static final int SRTM3_ROW_LENGTH = 1201; // 3 arc second resolution (90m)
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private static final int SRTM3_FILE_SIZE = SRTM3_ROW_LENGTH * SRTM3_ROW_LENGTH * Short.BYTES;
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private static final int SRTM1_ROW_LENGTH = 3601; // 1 arc second resolution (30m)
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static short[] imagePixels;
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private static void readHgtZip(String filename, int rowOffset, int colOffset) throws Exception {
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ZipInputStream zis = new ZipInputStream(new BufferedInputStream(new FileInputStream(filename)));
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try {
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for (; ; ) {
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ZipEntry ze = zis.getNextEntry();
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if (ze == null) break;
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if (ze.getName().endsWith(".hgt")) {
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readHgtFromStream(zis, rowOffset, colOffset, SRTM3_ROW_LENGTH);
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return;
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}
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}
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} finally {
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zis.close();
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}
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}
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private static void readHgtFromStream(InputStream is, int rowOffset, int colOffset, int rowLength)
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throws Exception {
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DataInputStream dis = new DataInputStream(new BufferedInputStream(is));
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for (int ir = 0; ir < rowLength; ir++) {
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int row = rowOffset + ir;
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for (int ic = 0; ic < rowLength; ic++) {
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int col = colOffset + ic;
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int i1 = dis.read(); // msb first!
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int i0 = dis.read();
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if (i0 == -1 || i1 == -1)
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throw new RuntimeException("unexcepted end of file reading hgt entry!");
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short val = (short) ((i1 << 8) | i0);
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if (val == NODATA2) {
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val = NODATA;
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}
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setPixel(row, col, val);
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}
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}
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}
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private static void setPixel(int row, int col, short val) {
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if (row >= 0 && row < NROWS && col >= 0 && col < NCOLS) {
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imagePixels[row * NCOLS + col] = val;
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}
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}
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private static short getPixel(int row, int col) {
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if (row >= 0 && row < NROWS && col >= 0 && col < NCOLS) {
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return imagePixels[row * NCOLS + col];
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}
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return NODATA;
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}
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public static void doConvert(String inputDir, int lonDegreeStart, int latDegreeStart, String outputFile) throws Exception {
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int extraBorder = 0;
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NROWS = 5 * 1200 + 1 + 2 * extraBorder;
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NCOLS = 5 * 1200 + 1 + 2 * extraBorder;
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imagePixels = new short[NROWS * NCOLS]; // 650 MB !
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// prefill as NODATA
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for (int row = 0; row < NROWS; row++) {
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for (int col = 0; col < NCOLS; col++) {
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imagePixels[row * NCOLS + col] = NODATA;
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}
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}
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for (int latIdx = -1; latIdx <= 5; latIdx++) {
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int latDegree = latDegreeStart + latIdx;
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int rowOffset = extraBorder + (4 - latIdx) * 1200;
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for (int lonIdx = -1; lonIdx <= 5; lonIdx++) {
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int lonDegree = lonDegreeStart + lonIdx;
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int colOffset = extraBorder + lonIdx * 1200;
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String filename = inputDir + "/" + formatLat(latDegree) + formatLon(lonDegree) + ".zip";
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File f = new File(filename);
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if (f.exists() && f.length() > 0) {
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System.out.println("exist: " + filename);
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readHgtZip(filename, rowOffset, colOffset);
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} else {
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System.out.println("none : " + filename);
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}
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}
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}
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boolean halfCol5 = false; // no halfcol tiles in lidar data (?)
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SrtmRaster raster = new SrtmRaster();
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raster.nrows = NROWS;
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raster.ncols = NCOLS;
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raster.halfcol = halfCol5;
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raster.noDataValue = NODATA;
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raster.cellsize = 1 / 1200.;
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raster.xllcorner = lonDegreeStart - (0.5 + extraBorder) * raster.cellsize;
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raster.yllcorner = latDegreeStart - (0.5 + extraBorder) * raster.cellsize;
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raster.eval_array = imagePixels;
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// encode the raster
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OutputStream os = new BufferedOutputStream(new FileOutputStream(outputFile));
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new RasterCoder().encodeRaster(raster, os);
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os.close();
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// decode the raster
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InputStream is = new BufferedInputStream(new FileInputStream(outputFile));
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SrtmRaster raster2 = new RasterCoder().decodeRaster(is);
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is.close();
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short[] pix2 = raster2.eval_array;
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if (pix2.length != imagePixels.length)
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throw new RuntimeException("length mismatch!");
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// compare decoding result
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for (int row = 0; row < NROWS; row++) {
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int colstep = halfCol5 ? 2 : 1;
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for (int col = 0; col < NCOLS; col += colstep) {
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int idx = row * NCOLS + col;
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short p2 = pix2[idx];
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if (p2 != imagePixels[idx]) {
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throw new RuntimeException("content mismatch: p2=" + p2 + " p1=" + imagePixels[idx]);
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}
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}
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}
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}
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private static String formatLon(int lon) {
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if (lon >= 180)
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lon -= 180; // TODO: w180 oder E180 ?
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String s = "E";
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if (lon < 0) {
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lon = -lon;
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s = "E";
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}
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String n = "000" + lon;
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return s + n.substring(n.length() - 3);
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}
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private static String formatLat(int lat) {
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String s = "N";
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if (lat < 0) {
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lat = -lat;
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s = "S";
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}
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String n = "00" + lat;
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return s + n.substring(n.length() - 2);
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}
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public static void main(String[] args) throws Exception {
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String filename90 = args[0];
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String filename30 = filename90.substring(0, filename90.length() - 3) + "bef";
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int srtmLonIdx = Integer.parseInt(filename90.substring(5, 7).toLowerCase());
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int srtmLatIdx = Integer.parseInt(filename90.substring(8, 10).toLowerCase());
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int ilon_base = (srtmLonIdx - 1) * 5 - 180;
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int ilat_base = 150 - srtmLatIdx * 5 - 90;
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doConvert(args[1], ilon_base, ilat_base, filename30);
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}
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public SrtmRaster getRaster(File f, double lon, double lat) throws Exception {
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long fileSize;
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InputStream inputStream;
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if (f.getName().toLowerCase().endsWith(".zip")) {
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String HGT_FILE_EXT = ".hgt";
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ZipInputStream zis = new ZipInputStream(new BufferedInputStream(new FileInputStream(f)));
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for (; ; ) {
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ZipEntry ze = zis.getNextEntry();
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if (ze == null) {
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throw new FileNotFoundException(f.getName() + " doesn't contain a " + HGT_FILE_EXT + " file.");
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}
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if (ze.getName().toLowerCase().endsWith(HGT_FILE_EXT)) {
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fileSize = ze.getSize();
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inputStream = zis;
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break;
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}
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}
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} else {
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fileSize = f.length();
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inputStream = new FileInputStream(f);
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}
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int rowLength;
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if (fileSize > SRTM3_FILE_SIZE) {
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rowLength = SRTM1_ROW_LENGTH;
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} else {
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rowLength = SRTM3_ROW_LENGTH;
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}
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// stay at 1 deg * 1 deg raster
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NROWS = rowLength;
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NCOLS = rowLength;
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imagePixels = new short[NROWS * NCOLS];
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// prefill as NODATA
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Arrays.fill(imagePixels, NODATA);
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readHgtFromStream(inputStream, 0, 0, rowLength);
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inputStream.close();
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SrtmRaster raster = new SrtmRaster();
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raster.nrows = NROWS;
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raster.ncols = NCOLS;
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raster.halfcol = false; // assume full resolution
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raster.noDataValue = NODATA;
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raster.cellsize = 1. / (double) (rowLength - SRTM_BORDER_OVERLAP);
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raster.xllcorner = (int) (lon < 0 ? lon - 1 : lon); //onDegreeStart - raster.cellsize;
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raster.yllcorner = (int) (lat < 0 ? lat - 1 : lat); //latDegreeStart - raster.cellsize;
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raster.eval_array = imagePixels;
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return raster;
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}
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}
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