def sampleAndGetStreetImageLinks(endPoints, sampleNum, picNum, ptrNum, intersectionPointInfo):
"""
Randomly select end points from the endPoint collection.
For each selected end point, call Google map street view image api
to get the street view images.
:return:
"""
print "sampling street images..."
# get 2x sampled points for skipping some images that are missing its date
sampledPoints = random.sample(endPoints, sampleNum) if sampleNum < len(endPoints) * 2 else endPoints
sampleData = [] # store (picture number, file name, lat and lng, link to image)
progress = Progress(10)
headings = CONFIG["gmap"]["headings"]
sampleNumDelta = len(headings)
for point in sampledPoints:
progress.printProgress()
result = getSurroundingStreetViewLinks(point, picNum, ptrNum, intersectionPointInfo)
sampleData += result
picNum += sampleNumDelta
ptrNum += 1
print ""
return sampleData
def sampleAndDownloadStreetImage(endPoints, sampleNum, picNum, ptrNum,
targetDirectory, intersectionPointInfo):
"""
Randomly select end points from the endPoint collection.
For each selected end point, call Google map street view image api
to get the street view images.
:return:
"""
print "downloading street images..."
sampledPoints = random.sample(
endPoints, sampleNum) if sampleNum < len(endPoints) else endPoints
sampleData = [] # store (picture number, file name, lat and lng)
progress = Progress(10)
headings = CONFIG["gmap"]["headings"]
sampleNumDelta = len(headings)
for point in sampledPoints:
progress.printProgress()
result = downloadSurroundingStreetView(point, targetDirectory, picNum,
ptrNum, intersectionPointInfo)
sampleData += result
picNum += sampleNumDelta
ptrNum += 1
print ""
return sampleData
