added dumper script first draft

git-svn-id: http://www.neo1973-germany.de/svn@18 46df4e5c-bc4e-4628-a0fc-830ba316316d

pylgrim/osmdump.py

@@ -0,0 +1,64 @@
+#!/usr/bin/python
+#coding=utf8
+
+import os
+import sys
+import math
+import time
+
+z = 10
+
+def download(x,y,z):
+    import urllib
+    try:
+        webFile = urllib.urlopen("http://a.tile.openstreetmap.org/%d/%d/%d.png"%(z,x,y))
+        if not os.path.exists("%d"%z):
+            os.mkdir("%d"%z)
+        if not os.path.exists("%d/%d"%(z,x)):
+            os.mkdir("%d/%d"%(z,x))
+        localFile = open("%d/%d/%d.png"%(z,x,y), 'w')
+        localFile.write(webFile.read())
+        webFile.close()
+        localFile.close()
+    except Exception, e:
+        print e
+        
+def lon2km(lat):
+    return math.cos(lat*math.pi/180)*2*math.pi*6378.137/360
+
+def getxy(lat,lon,z):
+    x = (lon+180)/360 * 2**z
+    y = (1-math.log(math.tan(lat*math.pi/180) + 1/math.cos(lat*math.pi/180))/math.pi)/2 * 2**z
+    return int(x),int(y)
+    
+lat = 49.009051
+lon = 8.402481
+
+r = 10
+
+lat1 = lat-r/111.32
+lon1 = lon-r/lon2km(49.009051)
+lat2 = lat+r/111.32
+lon2 = lon+r/lon2km(49.009051)
+
+tiles = 0
+#do not download zoom 18
+for z in range(5,18):
+    x1,y1 = getxy(lat1, lon1, z)
+    x2,y2 = getxy(lat2, lon2, z)
+    tiles += (x2-x1)*(y1-y2)
+    
+print "do you really want to download %d tiles? [Y/n]"%tiles,
+data = sys.stdin.read(1)
+if data in ("y", "Y"):
+    i = 1;
+    for z in range(5,18):
+        x1,y1 = getxy(lat1, lon1, z)
+        x2,y2 = getxy(lat2, lon2, z)
+        for x in xrange(x1,x2+1):
+            for y in xrange(y2,y1+1):
+                if not os.path.exists("%d/%d/%d.png"%(z,x,y)):
+                    download(x,y,z)
+                print "\r%i"%i,
+                sys.stdout.flush()
+                i+=1