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こんにちは私の助けが必要なのは、座標と衛星投影の距離を計算する方法を知っている人ならば、私は衛星の進路を予測するときに、将来のパスと私が置いた座標。その衛星が座標に近づくと、そのことを知らせるメッセージが表示されます。どうすればpyephemとの距離を計算できますか？
これは私があなたを助けてくれるコードを使用しています。
from mpl_toolkits.basemap import Basemap
from geopy.distance import great_circle
from matplotlib import colors
from pyorbital import tlefile
import matplotlib.pyplot as plt
import numpy as np
import math
import ephem
from datetime import datetime
tlefile.TLE_URLS = ( 'http://celestrak.com/NORAD/elements/resource.txt',)
sat_tle = tlefile.read('NUSAT 1 (FRESCO)')
sat = ephem.readtle("NUSAT 1 (FRESCO)", sat_tle.line1, sat_tle.line2)
obs = ephem.Observer()
# location for tge coordinates
print("Latitud ")
sat_lat = input()
print("Longitud suggested point")
sat_lon = input()
obs.lat = str(sat_lat)
obs.long = str(sat_lon)
# programar proyeccion del mapa
map = Basemap(projection='ortho', lat_0=sat_lat, lon_0=sat_lon, resolution='l')
# draw coastlines, country boundaries, fill continents.
map.drawcoastlines(linewidth=0.25)
map.drawcountries(linewidth=0.25)
map.fillcontinents(color='coral',lake_color='aqua')
# draw the edge of the map projection region (the projection limb)
map.drawmapboundary(fill_color='aqua')
# grid in latitud and longitud every 30 sec.
map.drawmeridians(np.arange(0,360,30))
map.drawparallels(np.arange(-90,90,30))
# plot
passes = 4
for p in range(passes):
coords = []
dists = []
tr, azr, tt, altt, ts, azs = obs.next_pass(sat)
print """Date/Time (UTC) Alt/Azim Lat/Long Elev"""
print """====================================================="""
while tr < ts:
obs.date = tr
sat.compute(obs)
print "%s | %4.1f %5.1f | %4.1f %+6.1f | %5.1f" % \
(tr, math.degrees(sat.alt), math.degrees(sat.az), math.degrees(sat.sublat), math.degrees(sat.sublong), sat.elevation/1000.)
sat_lat = math.degrees(sat.sublat)
sat_lon = math.degrees(sat.sublong)
dist = great_circle((sat_lat, sat_lon), (sat_lat, sat_lon)).miles
coords.append([sat_lon, sat_lat])
dists.append(dist)
tr = ephem.Date(tr + 30.0 * ephem.second)
md = min(dists)
imd = 1 - (float(md)/1400)
hue = float(240)/float(360)
clr = colors.hsv_to_rgb([hue, imd, 1])
map.drawgreatcircle(coords[0][0], coords[0][1], coords[-1][0], coords[-1][1], linewidth=2, color=clr)
obs.date = tr + ephem.minute
# map with UTC
date = datetime.utcnow()
cs=map.nightshade(date)
plt.title('next '+ str(passes)+ ' passes of the satellite')
plt.show()