3 # This is a helper script for generating pimped up OSM tiles.
4 # The standard openstreetmap-carto-style as used on openstreetmap.org
5 # looks extremely dull in Zoomlevels 0-8. They look a lot nicer if
6 # "landuse" (forests, deserts) is shown. One way to do this is to
7 # generate two modifications of the osm-carto style, render tiles
8 # in each style, and then merge them:
9 # - For the background, essentially empty all .mss files except
10 # style.mss and landcover.mss - you need to throw out everything but
11 # the landuse. For the landuse, make sure to adapt the rules so that
12 # it is shown on zoomlevel 8. Render only zoomlevel 8.
13 # - For the foreground, change style.mss: background-color within
14 # Map { } needs to be "transparent" (without the quotes). #world in
15 # shapefiles.mss needs to be removed. Render zoomlevels 0-8.
16 # For rendering, the polytiles.pl script from
17 # https://github.com/Zverik/polytiles can be very helpful.
18 # You might have to remove some non installed fonts from the XML.
19 # After you are done rendering the source tiles, you can then use this
20 # script to merge back+foreground. Voila, nicer looking tiles!
22 # WARNING: Doing this for zoom level 0 in HD requires 90 GB of
23 # space in $TMPDIR and/or RAM (depending on Graphics::Magick behaviour/config)!
24 # That's why levels 0+1 are not generated by default (you need to change
25 # a line below, or generate them manually instead).
27 # URL generally is: /zoom/X/Y.png within the dirs below.
29 # The source for the foreground that you want to put over the
30 # background. The foreground needs to exist for all zoomlevels you
32 $srcfgpath = '/mnt/tiles/statictiles/osm.org-lowzoom-fg/';
33 # The source for the background. Only one zoomlevel needs to exist,
35 $srcbgpath = '/mnt/tiles/statictiles/osm.org-lowzoom-bg/';
36 # Where the combined tiles (background+foreground) are written to.
37 $dstpath='/mnt/tiles/statictiles/osm.org-lowzoom-new/';
39 # The name is a bit misleading: ZOOMMAX actually sets the zoomlevel
40 # from which the backgrounds are taken (and then scaled as needed).
41 # You obviously cannot merge tiles with a zoomlevel greater than
45 # Tilesize. Usually 256 for normal tiles or 512 for HD.
58 my $dstfilename = sprintf("%s/%d/%d/%d.png", $dstpath, $ZS, $XS, $YS);
59 my $olfilename = sprintf("%s/%d/%d/%d.png", $srcfgpath, $ZS, $XS, $YS);
61 print("Sorry - can only merge Z <= $ZOOMMAX\n"); exit(1);
64 while ($ZS < $ZOOMMAX) {
65 $N = $N * 2; # Twice as many tiles (per direction)
66 $XS = $XS * 2; # Starting at 2*X
67 $YS = $YS * 2; # and 2*Y.
70 printf("Combining %d tiles (%d x %d pixels)\n", $N * $N, $N * $TILESIZE, $N * $TILESIZE);
71 # Now load them all and fill them into one big picture.
72 my $dimage = Graphics::Magick->new('size' => sprintf("%dx%d", $N * $TILESIZE, $N * $TILESIZE)); # magick => 'png',
73 $status = $dimage->Read("xc:white"); # This actually creates the image, the above does NOT - very intuitive!
74 warn "$status" if "$status";
76 for ($x = 0; $x < $N; $x++) {
77 for ($y = 0; $y < $N; $y++) {
78 my $fn = sprintf("%s/%d/%d/%d.png", $srcbgpath, $ZOOMMAX, $XS + $x, $YS + $y);
79 #print("Loading: $fn\n");
80 my $tmpimg = Graphics::Magick->new();
81 $status = $tmpimg->Read($fn);
82 warn "$status" if "$status";
83 $dimage->Composite( 'image' => $tmpimg, 'compose' => 'over',
84 'x' => ($x * $TILESIZE),
85 'y' => ($y * $TILESIZE));
88 $dimage->Resize('geometry' => sprintf("%dx%d", $TILESIZE, $TILESIZE), 'filter' => 'Lanczos');
89 #print("Loading: $olfilename\n");
90 my $olimg = Graphics::Magick->new();
91 $status = $olimg->Read($olfilename);
92 warn "$status" if "$status";
93 $dimage->Composite( 'image' => $olimg, 'compose' => 'over', 'x' => 0, 'y' => 0 );
94 print("Writing combined image to: $dstfilename\n");
95 $status = $dimage->Write($dstfilename);
96 warn "$status" if "$status";
105 #mergetile(5, 16, 10);
106 #mergetile(6, 33, 21);
107 #mergetile(7, 67, 43);
108 #mergetile(8, 135, 87);
109 my $rz; my $rx; my $ry;
110 for ($rz = 2; $rz <= 8; $rz++) {
111 my $ntilesperdir = 2 ** $rz; # Allgemein: 2 ^ Zoomlevel
112 for ($rx = 0; $rx < $ntilesperdir; $rx++) {
113 my $targdir = sprintf("%s/%d/%d", $dstpath, $rz, $rx);
115 print("Trying to create $targdir...");
116 # FIXME: mkdir -p - the zoom level dir might not exist either!
117 if (mkdir($targdir)) {
123 for ($ry = 0; $ry < $ntilesperdir; $ry++) {
124 mergetile($rz, $rx, $ry);