python抓取天地图瓦片

抓取天地图瓦片

【实例截图】

【核心代码】

# _*_coding:utf-8_*_
from urllib import request
import re
import urllib.request
import os
import random
import math

agents = [
    'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.101 Safari/537.36',
    'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.0.249.0 Safari/532.5',
    'Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US) AppleWebKit/532.9 (KHTML, like Gecko) Chrome/5.0.310.0 Safari/532.9',
    'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.7 (KHTML, like Gecko) Chrome/7.0.514.0 Safari/534.7',
    'Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/534.14 (KHTML, like Gecko) Chrome/9.0.601.0 Safari/534.14',
    'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.14 (KHTML, like Gecko) Chrome/10.0.601.0 Safari/534.14',
    'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.20 (KHTML, like Gecko) Chrome/11.0.672.2 Safari/534.20", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.27 (KHTML, like Gecko) Chrome/12.0.712.0 Safari/534.27',
    'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.24 Safari/535.1']

resolution={18:5.36441802978515E-06,
            17:1.07288360595703E-05,
            16:2.1457672119140625E-05,
            15:4.29153442382814E-05,
            14:8.58306884765629E-05,
            13:0.000171661376953125,
            12:0.00034332275390625,
            11:0.0006866455078125,
            10:0.001373291015625,
            9:0.00274658203125,
            8:0.0054931640625,
            7:0.010986328125,
            6:0.02197265625,
            5:0.0439453125,
            4:0.087890625,
            3:0.17578125,
            2:0.3515625,
            1:0.703125}



# 经纬度反算切片行列号 3857坐标系
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)
    xtile = math.floor(( lon_deg 180.0)/(resolution[zoom]*256))
    ytile = math.floor((90.0-lat_deg)/(resolution[zoom]*256))
    return (xtile, ytile)


# 下载图片
def getimg(Tpath, Spath, x, y):
    try:
        f = open(Spath, 'wb')
        req = urllib.request.Request(Tpath)
        req.add_header('User-Agent', random.choice(agents))  # 换用随机的请求头
        pic = urllib.request.urlopen(req, timeout=60)

        f.write(pic.read())
        f.close()
        print(str(x) '_' str(y) '下载成功')
    except Exception:
        print(str(x) '_' str(y) '下载失败,重试')
        getimg(Tpath, Spath, x, y)

zoom =16  # 下载切片的zoom


lefttop = deg2num( 28.317231,115.846340, zoom)  # 下载切片的左上角角点
rightbottom = deg2num( 23.567119,120.722095, zoom) 

print(str(lefttop[0]))
print(str(rightbottom[0]))
print(str(lefttop[1]))
print(str(rightbottom[1]))
print("共" str(lefttop[0] - rightbottom[0]))
print("共" str(lefttop[1] - rightbottom[1]))

for x in range(lefttop[0], rightbottom[0]):
    for y in range(lefttop[1], rightbottom[1]):
        path = "F:/lcc/fujian" "/" str(zoom) "/" str(x)
        if not os.path.exists(path):
           os.makedirs(path)

        tilepath = "http://t0.tianditu.gov.cn/DataServer?T=cia_c&x=" str(x) "&y=" str(y) "&l=" str(zoom) "&tk=28b495e4df789d971d2ae77b01a55a55"
        # 天地图的url 可以换成谷歌地图的
        getimg(tilepath, path "/" str(y) ".png", x, y)
print('完成')