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msg# 1.6.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.2
depth:
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5234531.stg¤ä5234531.btg.gz¤È¤¤¤Ã¤¿¥¿¥¤¥ë¥Õ¥¡¥¤¥ë¤Î¥¤¥ó¥Ç¥Ã¥¯¥¹ÈÖ¹æ(tile index ¤Þ¤¿¤Ï bucket index¤È¸Æ¤Ð¤ì¤Þ¤¹)¤Ë¤Ä¤¤¤Æ¤ÎÏÃÂê¤Ç¤¹¡£

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¡¡¡¡5234544.btg.gz¡¡5234545.btg.gz¡¡5234546.btg.gz¡¡5234547.btg.gz
¡¡¡¡5234536.btg.gz¡¡5234537.btg.gz¡¡5234538.btg.gz¡¡5234539.btg.gz
À¾5234528.btg.gz¡¡5234529.btg.gz¡¡5234530.btg.gz¡¡5234531.btg.gzÅì
¡¡¡¡5234520.btg.gz¡¡5234521.btg.gz¡¡5234522.btg.gz¡¡5234523.btg.gz
¡¡¡¡5234512.btg.gz¡¡5234513.btg.gz¡¡5234514.btg.gz¡¡5234515.btg.gz
¡¡¡¡5234504.btg.gz¢«°²¥Î¸Ð¤ò´Þ¤à¡¡¡¡¡¡¡¡5234506.btg.gz¡¡5234507.btg.gz
¡¡¡¡5234496.btg.gz¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ Æî¡¡¡¡¡¡¡¡¡¡¡¡¢¬¡¡¡¡¡¡¡¡¡¡¡¡5234499.btg.gz
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SDSU / OSGeo / FlightGear Landcover Database Mapserver
http://mapserver.flightgear.org/

1. ²èÌ̾åȾʬ¤ÎÃÏ¿Þ¤ò¥¯¥ê¥Ã¥¯¤·¤Æ¸«¤¿¤¤¾ì½ê¤Ë°ÜÆ°¤¹¤ë¤«¡¢²¼È¾Ê¬¤Îɽ¤Î1¹ÔÌܤޤ¿¤Ï2¹ÔÌܤ˸«¤¿¤¤¾ì½ê¤Î¾ðÊó¤òÆþÎϤ·¤Þ¤¹¡£
¤¿¤È¤¨¤Ð¡¢RJTT¤Ê¤é
Airport code - OpenLayers: ICAO: RJTT
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2. ¥Ö¥é¥¦¥¶Á´ÂΤËÃÏ¿Þ¤¬É½¼¨¤µ¤ì¤ë¤Î¤Ç¡¢²èÌ̱¦Â¦¤Î¡Ü¤ò¥¯¥ê¥Ã¥¯¤·¡¢²¼¤«¤é2ÈÖÌܤÎ
FG Scenery buckets
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http://wiki.flightgear.org/Tile_Index_Scheme
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http://sourceforge.net/p/flightgear/simgear/ci/next/tree/simgear/bucket/newbucket.cxx
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½Ä(°ÞÅÙÊý¸þ) 0.125ÅÙ
²£(·ÐÅÙÊý¸þ) 0.25ÅÙ
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RJTT(N35.549¡¢E139.788)¤ò´Þ¤à¥¿¥¤¥ë¤Î´ð½àÅÀ¤Ï
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lat=35
y=0.500/0.125=4 (y¤Ï0¡Á7¤ÎÀ°¿ô)
lon=139
x=0.750/0.25=3 (x¤Ï0¡Á3¤ÎÀ°¿ô¡¢Äã°ÞÅ٤ǤÏ0¡Á7¤ÎÀ°¿ô)

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tile index = (lon+180)*2^14 + (lat+90)*2^6 + y*2^3 + x
=(139+180)*16384 + (35+90)*64 + 4*8 + 3
= 5234531

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      10¿Ê¿ô, 2¿Ê¿ô
lon+180: 319, 100111111 (9bit)
lat+90:  125, 01111101 (8bit)
y:         4, 100 (3bit)
x:         3, 011 (3bit)

lon+180(9bit)¡¢lat+90(8bit)¡¢y(3bit)¡¢x(3bit)¤Î½ç¤Ë2¿Ê¿ô¤òʤ٤ë¤È
100111111 01111101 100 011

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5234531
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