將PM25資料套在台灣縣市區地圖上

tag 地圖繪製

good900700 2020-09-13 12:08:03 ‧ 1327 瀏覽

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import pandas as pd
import folium
pm25_url ='http://opendata.epa.gov.tw/webapi/Data/REWIQA/?$orderby=SiteName&$skip=0&$top=1000&format=json'
pm25 = pd.read_json(pm25_url)
m = folium.Map(location=[24, 121], zoom_start=7)
然後怎麼寫

㊣浩瀚星空㊣ iT邦大神 1 級 ‧ 2020-09-14 09:16:10 檢舉

用手寫

good900700 iT邦新手 5 級 ‧ 2020-09-19 11:04:44 檢舉

好

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1 個回答

japhenchen

iT邦超人 1 級 ‧ 2020-09-14 13:29:00

最佳解答

我真的不愛pandas，所以我改用jsonpickle改寫一下

import folium
import jsonpickle
import requests
import re
import os
localhtml = "taiwan.html"
pm25_url ='http://opendata.epa.gov.tw/webapi/Data/REWIQA/?$orderby=SiteName&$skip=0&$top=1000&format=json'
html = requests.get(pm25_url)

json = jsonpickle.decode(html.text)
m = folium.Map(location=[24, 121], zoom_start=7)
isdigit = re.compile(r'^\d+\.*\d*$')
for j in json:
    pm2p5 = j["PM2.5"]
    if isdigit.match(pm2p5) is not None:
        r = int(pm2p5)*500
        loc = (j["Latitude"],j["Longitude"])
        folium.Circle(loc,radius=r).add_to(m)

currpath = os.path.join( os.getcwd(),localhtml)
m.save(currpath)
os.system('start "{0}"'.format(currpath))  # windows開啟

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japhenchen iT邦超人 1 級 ‧ 2020-09-14 14:50:14 檢舉

改一下區分顏色跟填滿......看起來比較順眼
(點圏圈會出現地名跟數值)
寫的不好看還請見諒，今天第一次初學folium，真的靠摸索
借花獻佛...剛好派的上用場

# -*- coding:utf-8 -*-

import folium
import jsonpickle
import requests
import re
import os
from time import gmtime,strftime,localtime

def color_producer(r):
    cn="white"
    if r<=10 :
        cn = 'green'
    elif r>10 and r<=15:
        cn = 'yellow'
    elif r>15 and r<=20:
        cn= "red"
    else:
        cn= "purple"
    cr=  0.7
    return [cn,cr]

localhtml = "taiwan.html"
pm25_url ='http://opendata.epa.gov.tw/webapi/Data/REWIQA/?orderby=SiteName&skip=0&top=1000&format=json'
html = requests.get(pm25_url)

json = jsonpickle.decode(html.text)
center = (23.5, 121)
m = folium.Map(location=center, zoom_start=8,title="全台PM2.5分布圖")
folium.map.Marker(
    location=(23.2,121.4),
    icon=folium.DivIcon(
        icon_size=(300,36),
        icon_anchor=(0,0),
        html="<div style='font-size:1.8em;color:red;background-color:yellow;'>全台PM2.5分布圖</div>".format(strftime("%Y年%m月%d日 %H:%M:%S",localtime(8)))),
    ).add_to(m)

isdigit = re.compile(r'^\d+\.*\d*$')
fg = folium.FeatureGroup(name="PM2.5")
for j in json: 
    pm2p5 = j["PM2.5_AVG"]
    if j["Latitude"]!= "" and j["Longitude"]!="" and isdigit.match(pm2p5) is not None:
        r = int(pm2p5)
        cc = color_producer(r)
        loc = (j["Latitude"],j["Longitude"])
        #folium.Circle(loc,radius=r).add_to(m)
        fg.add_child(folium.CircleMarker(
            location=loc, 
            radius = r, 
            tooltip=str(r)+'\n'+j["SiteName"],
            fill_color=cc[0], 
            color = 'grey', 
            fill_opacity=cc[1]))

m.add_child(fg)                    

m.save(localhtml)

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