refine and add README

README

@@ -0,0 +1 @@
+python initial_pano_id.py 53.168051 8.647656 | python walk_pano_id.py 10 | python streetview.py 5

initial_pano_id.py

@@ -0,0 +1,28 @@
+#!/usr/env python
+
+import sys
+import urllib2
+from xml.etree.ElementTree import ElementTree, fromstring
+
+if len(sys.argv) != 3:
+    exit("need to supply lat and lon")
+
+lat = sys.argv[1]
+lon = sys.argv[2]
+
+# yaw north: 0 south: 180 east: 90 west: 270
+# pitch up: -90 down: 90
+# http://cbk0.google.com/cbk?output=xml&panoid=p-DIQUVaFuGHWxVqpLstbA
+
+try:
+    xml = urllib2.urlopen("http://cbk0.google.com/cbk?output=xml&ll=%s,%s"%(lat, lon))
+except urllib2.HTTPError as e:
+    exit(e.code + " " + e.msg)
+
+doc = fromstring(xml.read())
+pano_id = doc.find("data_properties")
+
+if pano_id is None:
+    exit("no streetview data avaiable here")
+
+print pano_id.get("pano_id")

streetview.py

@@ -6,52 +6,61 @@ from xml.etree.ElementTree import ElementTree, fromstring
 from PIL import Image
 from StringIO import StringIO
 
-if len(sys.argv) != 4:
-    exit("need to supply lat, lon and zoom (0-5)")
-
-lat = sys.argv[1]
-lon = sys.argv[2]
-zoom = int(sys.argv[3])
+gridsizes = [(1, 1),
+             (2, 1),
+             (4, 2),
+             (6, 3),
+             (13, 7),
+             (26, 13)]
 
 # yaw north: 0 south: 180 east: 90 west: 270
 # pitch up: -90 down: 90
 # http://cbk0.google.com/cbk?output=xml&panoid=p-DIQUVaFuGHWxVqpLstbA
 
-try:
-    xml = urllib2.urlopen("http://cbk0.google.com/cbk?output=xml&ll=%s,%s"%(lat, lon))
-except urllib2.HTTPError as e:
-    exit(e.code + " " + e.msg)
+def process(panoid, zoom):
+    print >>sys.stderr, panoid
+    # retrieve tiles and save panorama
+    panorama = Image.new("RGB", (gridsizes[zoom][0]*512, gridsizes[zoom][1]*512))
+    try:
+        for x in xrange(gridsizes[zoom][0]):
+            for y in xrange(gridsizes[zoom][1]):
+                print >>sys.stderr, x, y
+                tile = urllib2.urlopen("http://cbk0.google.com/cbk?output=tile&panoid=%s&zoom=%d&x=%d&y=%d"%(panoid, zoom, x, y))
+                imtile = Image.open(StringIO(tile.read()))
+                panorama.paste(imtile, (x*512, y*512))
+    except urllib2.HTTPError as e:
+        exit(e.code + " " + e.msg)
+    panorama.save("%s_panorama.jpg"%panoid)
 
-doc = fromstring(xml.read())
-pano_id = doc.find("data_properties")
+    # divide into 16 images around the center
+    num_imgs = 8
 
-if pano_id is None:
-    exit("no streetview data avaiable here")
+    cwidth = (512*gridsizes[zoom][0])/num_imgs
+    cheight = (cwidth*3)/4 # 4:3 aspect
+    upper = (gridsizes[zoom][1]*512)/2 - cheight/2
+    lower = upper+cheight
 
-pano_id = pano_id.get("pano_id")
+    for i in xrange(num_imgs):
+        p = panorama.crop((i*cwidth,upper,(i+1)*cwidth,lower))
+        filename="%s_img_%003d.jpg"%(panoid,i)
+        p.save(filename)
 
-gridsizes = [(1, 1),
-             (2, 1),
-             (4, 2),
-             (6, 3),
-             (13, 7),
-             (26, 13)]
+    # save thumbnail
+    try:
+        url = urllib2.urlopen("http://cbk0.google.com/cbk?output=thumbnail&panoid=%s&w=416&h=208"%panoid)
+        open("%s_thumb.jpg"%panoid, "w").write(url.read())
+    except urllib2.HTTPError as e:
+        exit(e.code + " " + e.msg)
+
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        exit("need to supply zoom (0-5)")
+
+    zoom = int(sys.argv[1])
 
-panorama = Image.new("RGB", (gridsizes[zoom][0]*512, gridsizes[zoom][1]*512))
+    from_stdin = sys.stdin.readlines()
+    for line in from_stdin:
+        process(line.strip(), zoom)
 
-try:
-    for x in xrange(gridsizes[zoom][0]):
-        for y in xrange(gridsizes[zoom][1]):
-            tile = urllib2.urlopen("http://cbk0.google.com/cbk?output=tile&panoid=%s&zoom=%d&x=%d&y=%d"%(pano_id, zoom, x, y))
-            imtile = Image.open(StringIO(tile.read()))
-            panorama.paste(imtile, (x*512, y*512))
-except urllib2.HTTPError as e:
-    exit(e.code + " " + e.msg)
 
-panorama.save("panorama.jpg")
 
-try:
-    url = urllib2.urlopen("http://cbk0.google.com/cbk?output=thumbnail&w=416&h=208&ll=%s,%s"%(lat, lon))
-    open("thumbnail.jpg", "w").write(url.read())
-except urllib2.HTTPError as e:
-    exit(e.code + " " + e.msg)

walk_pano_id.py

@@ -0,0 +1,42 @@
+#!/usr/env python
+
+import sys
+import urllib2
+from xml.etree.ElementTree import ElementTree, fromstring
+
+def links_from_panoid(panoid):
+    try:
+        xml = urllib2.urlopen("http://cbk0.google.com/cbk?output=xml&panoid=%s"%panoid)
+    except urllib2.HTTPError as e:
+        exit(e.code + " " + e.msg)
+    doc = fromstring(xml.read())
+    return [link.get("pano_id") for link in doc.findall("annotation_properties/link")]
+
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        exit("need to supply maximum number of positions")
+
+    from_stdin = sys.stdin.readlines()
+    if len(from_stdin) != 1:
+        exit("only one initial pano_id expected on stdin")
+    init_pano = from_stdin[0].strip()
+    max_pos = int(sys.argv[1])
+
+    result = set([init_pano])
+    toprocess = [init_pano]
+
+    # breadth first search
+    while len(result) < max_pos and toprocess:
+        newtoprocess = []
+        for panoid in toprocess:
+            if len(result) >= max_pos:
+                break
+            ids = links_from_panoid(panoid)
+            for p in ids:
+                if p not in result:
+                    newtoprocess.append(p)
+            result.update(ids)
+        toprocess = newtoprocess
+
+    for p in result:
+        print p