led_karte/get_coordinates.py

#!/usr/bin/python
import requests, json, pickle, os.path, svgwrite

URL = "https://directory.spaceapi.io/"
NORTHERNMOST = 55.05
EASTERNMOST = 15.033333
SOUTHERNMOST = 47.270108
WESTERNMOST = 5.866667
YSPAN = NORTHERNMOST - SOUTHERNMOST
XSPAN = EASTERNMOST - WESTERNMOST
locations = {}
if os.path.isfile('locations.bin'):
    print ("using offline data...")
    with open("locations.bin", "rb") as f:
        locations = pickle.load(f)
else:
    print ("offline data not available, downloading...,")
    r = requests.get(url = URL)
    data = r.json()
    for space in data:
        spacerequest = None
        try:
            spacerequest = requests.get(url = data[space], timeout=1)
        except requests.exceptions.RequestException as e:  # This is the correct syntax
            continue
        try:
            spacedata = spacerequest.json()
        except json.JSONDecodeError as jde:
            continue
        if "location" in spacedata:
            if "lat" in spacedata["location"]:
                lat = spacedata["location"]["lat"]
                lon = spacedata["location"]["lon"]
                locations[space] = [float(lat), float(lon)]

    for space in locations:
        print (space + " " +  str(locations[space]))
    with open("locations.bin", "wb") as f:
        pickle.dump(locations, f, pickle.HIGHEST_PROTOCOL)
print ("Removing non-german points...")
german_locations = locations.copy()
for space in locations:
    if locations[space][0] > NORTHERNMOST:
        del german_locations[space]
        print ("kicked " + space + " too far north")
    elif locations[space][0] < SOUTHERNMOST:
        del german_locations[space]
        print ("kicked " + space + " too far south")
    elif locations[space][1] < WESTERNMOST:
        del german_locations[space]
        print ("kicked " + space + " too far west")
    elif locations[space][1] > EASTERNMOST:
        del german_locations[space]
        print ("kicked " + space + " too far east")

dwg = svgwrite.Drawing('svgwrite-example.svg', profile='tiny')
dwg.add(svgwrite.image.Image(href="Karte_Deutschland.svg", size=(572,770)))
dwg.add(dwg.circle(center=(0,0), r=3, fill='black'))
for space in german_locations:
    ypoint = (770 - (((german_locations[space][0] - SOUTHERNMOST) / YSPAN)* 770))
    dwg.add(dwg.circle(center=(((locations[space][1] - WESTERNMOST) / XSPAN) *
        572, ypoint), r=1, fill='black'))
dwg.save()