osm: add script to grab all tiles for an area

This commit is contained in:
Frédéric Péters 2018-07-08 23:43:47 +02:00
parent e8d4e1ba28
commit 3d6b62eac0
1 changed files with 38 additions and 0 deletions

38
osm/grabtiles.py Normal file
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import math
import os
import requests
def deg2num(lat_deg, lon_deg, zoom):
lat_rad = math.radians(lat_deg)
n = 2.0 ** zoom
xtile = int((lon_deg + 180.0) / 360.0 * n)
ytile = int((1.0 - math.log(math.tan(lat_rad) + (1 / math.cos(lat_rad))) / math.pi) / 2.0 * n)
return (xtile, ytile)
COMBO_MAP_MAX_BOUNDS = {
"corner1": {"lat": 45.9134, "lng": 4.6733},
"corner2": {"lat": 45.5583, "lng": 5.1574}
}
for zoom in range(3, 19):
xtile1, ytile1 = deg2num(COMBO_MAP_MAX_BOUNDS['corner1']['lat'],
COMBO_MAP_MAX_BOUNDS['corner1']['lng'],
zoom)
xtile2, ytile2 = deg2num(COMBO_MAP_MAX_BOUNDS['corner2']['lat'],
COMBO_MAP_MAX_BOUNDS['corner2']['lng'],
zoom)
for xtile in range(xtile1, xtile2+1):
for ytile in range(ytile1, ytile2+1):
path = '%s/%s/%s.png' % (zoom, xtile, ytile)
if os.path.exists(path):
continue
url = 'https://tiles.entrouvert.org/hdm/%s/%s/%s.png' % (zoom, xtile, ytile)
print url
if not os.path.exists(os.path.dirname(path)):
os.makedirs(os.path.dirname(path))
r = requests.get(url)
if r.status_code != 200:
continue
with open(path, 'w') as fd:
fd.write(r.content)