-package tim.prune.function.srtm.gen;
-
-import java.io.BufferedReader;
-import java.io.File;
-import java.io.FileOutputStream;
-import java.io.FileReader;
-
-/**
- * Class used to generate a lookup file to find the URLs of SRTM tiles.
- * The tiles are split into directories for each continent, so we need some way
- * of going from coordinates to directories.
- * This class reads the directory listings from the files tiles1.txt, tiles2.txt etc
- * and combines the result into a binary array
- */
-public class GenerateTileLookup
-{
-
- /**
- * Main method for generating the array
- * @param args ignored
- */
- public static void main(String[] args)
- {
- System.out.println("Generate tile lookup");
- byte[] lookup = new byte[360 * 120]; // +/- 180 degrees longitude, +/- 60 degrees latitude
- for (int f=1; f<= 6; f++)
- {
- try
- {
- BufferedReader r = new BufferedReader(new FileReader(new File("tim/prune/function/srtm/gen/tiles" + f + ".txt")));
- String line = r.readLine();
- System.out.println("Read continent: '" + line + "'");
- while ((line = r.readLine()) != null) {
- if (line.length() == 7)
- {
- boolean north = (line.charAt(0) == 'N');
- int lat = Integer.parseInt(line.substring(1, 3));
- if (!north) {lat = -lat;}
- boolean east = (line.charAt(3) == 'E');
- int lon = Integer.parseInt(line.substring(4));
- if (!east) {lon = -lon;}
- // Store in lookup
- int arrindex = (lat+59)*360 + (lon+180);
- lookup[arrindex] = (byte) f;
- }
- }
- }
- catch (Exception e) {
- e.printStackTrace();
- }
- }
- // Now f should be populated
- StringBuilder b = new StringBuilder();
- for (int l=-180; l<180; l++) {
- int i = 59 * 360 + (l+180);
- b.append("" + lookup[i]);
- }
- System.out.println("equator: " + b.toString());
-
- // Write bytes to file
- try {
- FileOutputStream out = new FileOutputStream(new File("srtmtiles.dat"));
- out.write(lookup);
- out.close();
- }
- catch (Exception e) {
- e.printStackTrace();
- }
- }
-}