StackOverflow2013

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PO
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15580772
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2013-03-22T22:20:23.200
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2013-03-22T22:20:23.200
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1996306
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15560931
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text
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I figured this one out after discovering how <code>OpenStreetMap</code> stores its tiles. The basics are: <ul> <li>Tiles are 256 × 256 pixel PNG files</li> <li>Each zoom level is a directory, each column is a subdirectory, and each tile in that column is a file</li> <li>To access a file use <code>http://localhost/osm/${z}/${x}/${y}.png</code></li> <li>Calculate the <code>${z} ${x} and ${y}</code> values based on the latitude and longitude.</li> </ul> There is some excellent documentation on this subject on the <a href="http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames" rel="nofollow">OpenStreetMap Wiki</a>, including code blocks in various languages to calculate the tile names. I needed a Java solution so the code I ended up using is: <pre><code>public class Mapper { public static void main(String[] args) { int zoom = 11; double lat = -33.77651d; double lon = 150.94712d; System.out.println("http://localhost/osm/" + getTileNumber(lat, lon, zoom) + ".png"); } public static String getTileNumber(double lat, double lon, int zoom) { int xtile = (int)Math.floor((lon + 180) / 360 * (1<<zoom)); int ytile = (int)Math.floor((1 - Math.log(Math.tan(Math.toRadians(lat)) + 1 / Math.cos(Math.toRadians(lat))) / Math.PI) / 2 * (1<<zoom)); return ("" + zoom + "/" + xtile + "/" + ytile); } } </code></pre> This returns a URL for the required image tile, eg: <code>http://localhost/osm/11/1882/1228.png</code> which you can then use to acquire the image. I then used <a href="https://code.google.com/p/thumbnailator/" rel="nofollow">Thumbnailator</a> to generate the 128x128 thumbnail size: <pre><code>Thumbnails.of(new File("tile.png")) .size(128, 128) .toFile(new File("thumbnail.png")); </code></pre> Happy days.
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1. This table or related slice is empty.
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1. POGenerating map thumbnails using OpenStreetMap
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1. PTAnswer
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1. USSteven Wolfe
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1. POGenerating map thumbnails using OpenStreetMap
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