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Jul 31st, 2012
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  1.  
  2. <html><head>
  3.  
  4.  
  5.  
  6.  
  7.  
  8. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  9.  
  10. <meta name="GENERATOR" content="Microsoft DHTML Editing Control"><title>Google Maps Image Tiles</title>
  11.  
  12.  
  13.  
  14. <style>
  15.  
  16. button, input { border-width: 1px; font-size:12px;padding: 0 2px;}
  17.  
  18. input { text-align:right; }
  19.  
  20.  
  21.  
  22. </style></head><body style="font-family: Verdana,sans-serif; font-size: 80%; text-align: center; color: rgb(204, 204, 204); background-color: black;" onload="DoRebuild()">
  23.  
  24.  
  25.  
  26. <script language="JavaScript" type="text/javascript"> <!--
  27.  
  28.  
  29.  
  30. function element(id)
  31.  
  32. {
  33.  
  34. return document.getElementById(id);
  35.  
  36. }
  37.  
  38.  
  39.  
  40. function DoRebuild()
  41.  
  42. {
  43.  
  44. var addr = GetQuadtreeAddress(element("input_longitude").value, element("input_latitude").value);
  45.  
  46. var coords = GetCoordinatesFromAddress(addr);
  47.  
  48.  
  49.  
  50. element("calculated_longitude").innerHTML = "" + GetSexagesimalNotation(coords.long);
  51.  
  52. element("calculated_latitude").innerHTML = "" + GetSexagesimalNotation(coords.lat);
  53.  
  54.  
  55.  
  56. // build a 3x3 table
  57.  
  58. var cursor = addr.substr(0, parseInt(element("input_zoom").value));
  59.  
  60. cursor = GetNextTileX(cursor,0); // move to top left
  61.  
  62. cursor = GetNextTileY(cursor,0);
  63.  
  64.  
  65.  
  66. for (var x = 0; x < 3; x++)
  67.  
  68. {
  69.  
  70. var c2 = cursor;
  71.  
  72. cursor = GetNextTileX(cursor,1);
  73.  
  74. for (var y = 0; y < 3; y++)
  75.  
  76. {
  77.  
  78.  
  79.  
  80. element("t" + y + x).style.backgroundImage = "url(" + "http://khm.google.com/kh?v=88&t=" + c2 + ")";
  81.  
  82. c2 = GetNextTileY(c2,1);
  83.  
  84. }
  85.  
  86. }
  87.  
  88.  
  89.  
  90.  
  91.  
  92.  
  93.  
  94.  
  95.  
  96. // populate the progression of images
  97.  
  98. for (var i = 0; i < 20; i++)
  99.  
  100. {
  101.  
  102.  
  103.  
  104. var el = element("m" + i);
  105.  
  106. if (el)
  107.  
  108. {
  109.  
  110. var src = "http://khm.google.com/kh?v=88&t=" + addr.substr(0, i+1);
  111.  
  112. el.alt = "Google Maps Address " + addr.substr(0, i+1);
  113.  
  114. el.style.backgroundImage = "url(" + src + ")";
  115.  
  116. el.src = "m" + addr.substr(i+1,1) + ".png";
  117.  
  118. }
  119.  
  120. }
  121.  
  122. }
  123.  
  124.  
  125.  
  126. function GetNextTileX(addr, forward)
  127.  
  128. {
  129.  
  130. if (addr == '')
  131.  
  132. return addr;
  133.  
  134.  
  135.  
  136. var parent = addr.substr(0, addr.length-1);
  137.  
  138. var last = addr.substr(addr.length-1);
  139.  
  140.  
  141.  
  142. if (last == 'q')
  143.  
  144. {
  145.  
  146. last = 'r';
  147.  
  148. if (!forward)
  149.  
  150. parent = GetNextTileX(parent, forward);
  151.  
  152. }
  153.  
  154. else if (last == 'r')
  155.  
  156. {
  157.  
  158. last = 'q';
  159.  
  160. if (forward)
  161.  
  162. parent = GetNextTileX(parent, forward);
  163.  
  164. }
  165.  
  166. else if (last == 's')
  167.  
  168. {
  169.  
  170. last = 't';
  171.  
  172. if (forward)
  173.  
  174. parent = GetNextTileX(parent, forward);
  175.  
  176. }
  177.  
  178. else if (last == 't')
  179.  
  180. {
  181.  
  182. last = 's';
  183.  
  184. if (!forward)
  185.  
  186. parent = GetNextTileX(parent, forward);
  187.  
  188. }
  189.  
  190. return parent + last;
  191.  
  192. }
  193.  
  194.  
  195.  
  196. function GetNextTileY(addr, forward)
  197.  
  198. {
  199.  
  200. if (addr == '')
  201.  
  202. return addr;
  203.  
  204.  
  205.  
  206. var parent = addr.substr(0, addr.length-1);
  207.  
  208. var last = addr.substr(addr.length-1);
  209.  
  210.  
  211.  
  212. if (last == 'q')
  213.  
  214. {
  215.  
  216. last = 't';
  217.  
  218. if (!forward)
  219.  
  220. parent = GetNextTileY(parent, forward);
  221.  
  222. }
  223.  
  224. else if (last == 'r')
  225.  
  226. {
  227.  
  228. last = 's';
  229.  
  230. if (!forward)
  231.  
  232. parent = GetNextTileY(parent, forward);
  233.  
  234. }
  235.  
  236. else if (last == 's')
  237.  
  238. {
  239.  
  240. last = 'r';
  241.  
  242. if (forward)
  243.  
  244. parent = GetNextTileY(parent, forward);
  245.  
  246. }
  247.  
  248. else if (last == 't')
  249.  
  250. {
  251.  
  252. last = 'q';
  253.  
  254. if (forward)
  255.  
  256. parent = GetNextTileY(parent, forward);
  257.  
  258. }
  259.  
  260. return parent + last;
  261.  
  262. }
  263.  
  264.  
  265.  
  266. function MercatorToNormal(y)
  267.  
  268. {
  269.  
  270. y = -y * Math.PI / 180; // convert to radians
  271.  
  272. y = Math.sin(y);
  273.  
  274. y = (1+y)/(1-y);
  275.  
  276. y = 0.5 * Math.log(y);
  277.  
  278. y *= 1.0 / (2 * Math.PI); // scale factor from radians to normalized
  279.  
  280. y += 0.5; // and make y range from 0 - 1
  281.  
  282. return y;
  283.  
  284. }
  285.  
  286.  
  287.  
  288. function NormalToMercator(y)
  289.  
  290. {
  291.  
  292. y -= 0.5;
  293.  
  294. y *= 2 * Math.PI;
  295.  
  296. y = Math.exp(y * 2);
  297.  
  298. y = (y-1)/(y+1);
  299.  
  300. y = Math.asin(y);
  301.  
  302. y = y * -180/Math.PI;
  303.  
  304. return y;
  305.  
  306. }
  307.  
  308.  
  309.  
  310. function GetSexagesimalNotation(x)
  311.  
  312. {
  313.  
  314.  
  315.  
  316. // 23° 27′ 30"
  317.  
  318. var ret = "";
  319.  
  320. if (x < 0)
  321.  
  322. {
  323.  
  324. ret += '-';
  325.  
  326. x = -x;
  327.  
  328. }
  329.  
  330. ret += Math.floor(x);
  331.  
  332. ret += '° ';
  333.  
  334.  
  335.  
  336. x = (x - Math.floor(x)) * 60;
  337.  
  338. ret += Math.floor(x);
  339.  
  340. ret += "' ";
  341.  
  342.  
  343.  
  344. x = (x - Math.floor(x)) * 60;
  345.  
  346. ret += Math.floor(x);
  347.  
  348. ret += '" ';
  349.  
  350.  
  351.  
  352. return ret;
  353.  
  354. }
  355.  
  356.  
  357.  
  358. function GetCoordinatesFromAddress(str)
  359.  
  360. {
  361.  
  362.  
  363.  
  364. // get normalized coordinate first
  365.  
  366. var x = 0.0;
  367.  
  368. var y = 0.0;
  369.  
  370. var scale = 1.0;
  371.  
  372. str = str.toLowerCase();
  373.  
  374. str = str.substr(1); // skip the first character
  375.  
  376. while (str.length > 0)
  377.  
  378. {
  379.  
  380. scale *= 0.5;
  381.  
  382. var c = str.charAt(0); // remove first character
  383.  
  384. if (c == 'r' || c == 's')
  385.  
  386. {
  387.  
  388.  
  389.  
  390. x += scale;
  391.  
  392. }
  393.  
  394. if (c == 't' || c == 's')
  395.  
  396. {
  397.  
  398.  
  399.  
  400. y += scale;
  401.  
  402. }
  403.  
  404.  
  405.  
  406. str = str.substr(1);
  407.  
  408. }
  409.  
  410.  
  411.  
  412. var ret = new Object();
  413.  
  414.  
  415.  
  416. ret.longmin = (x - 0.5) * 360;
  417.  
  418. ret.latmin = NormalToMercator(y);
  419.  
  420. ret.longmax = (x + scale - 0.5) * 360;
  421.  
  422. ret.latmax = NormalToMercator(y + scale);
  423.  
  424. ret.long = (x + scale * 0.5 - 0.5) * 360;
  425.  
  426. ret.lat = NormalToMercator(y + scale * 0.5);
  427.  
  428.  
  429.  
  430. return ret;
  431.  
  432. }
  433.  
  434.  
  435.  
  436.  
  437.  
  438.  
  439.  
  440. function GetQuadtreeAddress(long, lat)
  441.  
  442. {
  443.  
  444. // now convert to normalized square coordinates
  445.  
  446. // use standard equations to map into mercator projection
  447.  
  448.  
  449.  
  450. var x = (180.0 + parseFloat(long)) / 360.0;
  451.  
  452. var y = MercatorToNormal(parseFloat(lat));
  453.  
  454.  
  455.  
  456. var quad = "t"; // google addresses start with t
  457.  
  458. var lookup = "qrts"; // tl tr bl br
  459.  
  460.  
  461.  
  462. for (digits = 0; digits < 24; digits++)
  463.  
  464. {
  465.  
  466. // make sure we only look at fractional part
  467.  
  468. x -= Math.floor(x);
  469.  
  470. y -= Math.floor(y);
  471.  
  472.  
  473.  
  474. quad = quad + lookup.substr((x>=0.5?1:0) + (y>=0.5?2:0), 1);
  475.  
  476.  
  477.  
  478. // now descend into that square
  479.  
  480. x *= 2;
  481.  
  482. y *= 2;
  483.  
  484. }
  485.  
  486. return quad;
  487.  
  488. }
  489.  
  490.  
  491.  
  492. //--> </script>
  493.  
  494.  
  495.  
  496.  
  497.  
  498. <h2>Sample: Addressing Google Maps image tiles</h2>
  499.  
  500. <form name="theForm" onsubmit="DoRebuild(); return false;">
  501.  
  502. <em>Fetch Google Maps tiles via longitude/latitude</em>
  503.  
  504. <input style="width: 6em;" id="input_longitude" name="longitude" value="151.211">
  505.  
  506. <input style="width: 6em;" id="input_latitude" name="latitude" value="-33.852">
  507.  
  508. <input style="width: 6em;" id="input_zoom" name="zoom" value="21">
  509.  
  510. <button style="margin: 0pt 8px;" type="submit">Rebuild</button>
  511.  
  512. </form>
  513.  
  514.  
  515.  
  516. <div><em>(Image centered at: <span id="calculated_longitude"></span>, <span id="calculated_latitude"></span>)</em></div>
  517.  
  518.  
  519.  
  520. <table style="border: 2px solid white; margin: 1em auto; background-color: rgb(17, 17, 68);" align="center" cellpadding="0" cellspacing="0">
  521.  
  522. <tbody><tr><td style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttsstrst);" id="t00" height="256" width="256">&nbsp;</td><td style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttsstrss);" id="t01" height="256" width="256">&nbsp;</td><td style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttsssqtt);" id="t02" height="256" width="256">&nbsp;</td></tr>
  523.  
  524. <tr><td style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttsstsrq);" id="t10" height="256" width="256">&nbsp;</td><td style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttsstsrr);" id="t11" height="256" width="256">&nbsp;</td><td style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttssstqq);" id="t12" height="256" width="256">&nbsp;</td></tr>
  525.  
  526. <tr><td style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttsstsrt);" id="t20" height="256" width="256">&nbsp;</td><td style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttsstsrs);" id="t21" height="256" width="256">&nbsp;</td><td style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttssstqt);" id="t22" height="256" width="256">&nbsp;</td></tr>
  527.  
  528. </tbody></table>
  529.  
  530.  
  531.  
  532. <h2>All tiles containing these coordinates</h2>
  533.  
  534.  
  535.  
  536. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=t);" alt="Google Maps Address t" id="m0" src="ms.png" hspace="0">
  537.  
  538. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=ts);" alt="Google Maps Address ts" id="m1" src="mr.png" hspace="0">
  539.  
  540. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsr);" alt="Google Maps Address tsr" id="m2" src="mr.png" hspace="0">
  541.  
  542. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrr);" alt="Google Maps Address tsrr" id="m3" src="mt.png" hspace="0">
  543.  
  544. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrt);" alt="Google Maps Address tsrrt" id="m4" src="ms.png" hspace="0">
  545.  
  546. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrts);" alt="Google Maps Address tsrrts" id="m5" src="mq.png" hspace="0">
  547.  
  548. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsq);" alt="Google Maps Address tsrrtsq" id="m6" src="mr.png" hspace="0">
  549.  
  550. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqr);" alt="Google Maps Address tsrrtsqr" id="m7" src="ms.png" hspace="0">
  551.  
  552. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrs);" alt="Google Maps Address tsrrtsqrs" id="m8" src="ms.png" hspace="0">
  553.  
  554. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrss);" alt="Google Maps Address tsrrtsqrss" id="m9" src="mq.png" hspace="0">
  555.  
  556. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssq);" alt="Google Maps Address tsrrtsqrssq" id="m10" src="mq.png" hspace="0">
  557.  
  558. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqq);" alt="Google Maps Address tsrrtsqrssqq" id="m11" src="mt.png" hspace="0">
  559.  
  560. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqt);" alt="Google Maps Address tsrrtsqrssqqt" id="m12" src="mt.png" hspace="0">
  561.  
  562. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqtt);" alt="Google Maps Address tsrrtsqrssqqtt" id="m13" src="ms.png" hspace="0">
  563.  
  564. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqtts);" alt="Google Maps Address tsrrtsqrssqqtts" id="m14" src="ms.png" hspace="0">
  565.  
  566. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttss);" alt="Google Maps Address tsrrtsqrssqqttss" id="m15" src="mt.png" hspace="0">
  567.  
  568. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttsst);" alt="Google Maps Address tsrrtsqrssqqttsst" id="m16" src="ms.png" hspace="0">
  569.  
  570. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttssts);" alt="Google Maps Address tsrrtsqrssqqttssts" id="m17" src="mr.png" hspace="0">
  571.  
  572. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttsstsr);" alt="Google Maps Address tsrrtsqrssqqttsstsr" id="m18" src="mr.png" hspace="0">
  573.  
  574. <img style="background-image: url(http://khm.google.com/kh?v=88&amp;t=tsrrtsqrssqqttsstsrr);" alt="Google Maps Address tsrrtsqrssqqttsstsrr" id="m19" src="mr.png" hspace="0">
  575.  
  576.  
  577.  
  578. <p></p>
  579.  
  580.  
  581.  
  582. <p><small>
  583.  
  584. Code by <a href="http://intepid.com/">Mark Pursey</a> updated 6:52:37 PM Tuesday 27/05/2008</small>
  585.  
  586. </p> </body></html>
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