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plotLightningStrikes.py
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plotLightningStrikes.py
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#!/usr/bin/env python
import socket
import struct
import json
from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
import numpy as np
#####################################
### REFERENCES
# ENTLN Data Feed Documentation: http://www.bandgap.cs.rice.edu/classes/comp410/resources/SiteAssets/Using%20IoT/WeatherBug%20API%20info/ENTLN%20Lightning%20Data%20Feed%20v3%20ICD%20-%20UM67.pdf
# Parse byte string payload: http://stackoverflow.com/questions/27428936/python-size-of-message-to-send-via-socket
# Map of CONUS: http://geodesygina.com/matplotlib.html
# Plot lat/lng point on map: https://peak5390.wordpress.com/2012/12/08/matplotlib-basemap-tutorial-plotting-points-on-a-simple-map/
#####################################
### CONNECTION INFO
# TCP URL FOR ENTLN
TCP_URL = 'lx.datamart.earthnetworks.com'
TCP_PORT = 80
# TCP URL (SSL) FOR ENTLN
#TCP_SSL_URL = TCP_URL
#TCP_SSL_PORT = 443
#####################################
### AUTHENTICATION MESSAGE
# PARTER ID (PROVIDED BY EARTH NETWORKS)
a_partner_id = 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX'
# VERSION
a_version = '3'
# FORMAT
# 1 - ASCII format (UTF-8 format)
# 2 - Binary format
a_format = '1'
# TYPE
# 1 - Flash
# 2 - Pulse
# 3 - Combination Flash and Pulse
a_type = '2'
# AUTHENTICATION PAYLOAD
msg_authenticate = {
"p": a_partner_id,
"v": a_version,
"f": a_format,
"t": a_type
}
#####################################
### DEFINE FUNCTIONS
# INITIALIZE MAP OF CONUS
def initMap():
# Plot Interactive Mode
plt.ion()
# Create New Map
m = Basemap(projection='merc',llcrnrlat=20,urcrnrlat=50,\
llcrnrlon=-130,urcrnrlon=-60,lat_ts=20,resolution='i')
# Draw Coastlines, Countries, States
m.drawcoastlines()
m.drawcountries()
m.drawstates()
# Draw Parallels and Meridians.
parallels = np.arange(-90.,91.,5.)
# Label the Meridians and Parallels
m.drawparallels(parallels,labels=[False,True,True,False])
# Draw Meridians and Labels
meridians = np.arange(-180.,181.,10.)
m.drawmeridians(meridians,labels=[True,False,False,True])
m.drawmapboundary(fill_color='grey')
plt.title("Lightning!")
plt.show()
return m
# PLOT LIGHTNING STRIKE ON MAP
def plotStrike(m, data):
# Extract Lat/Lon from Message
lat = float(data['latitude'])
lon = float(data['longitude'])
# Convert to Map XY
x,y = m(lon, lat)
# Add XY Point to Map
m.plot(x, y, 'rx', markersize=18)
# Pause Plot to Allow Refresh
plt.pause(0.1)
# Get Socket Message
def get_msg(s):
header_bytes = 4
count = struct.unpack('>i', _get_block(s, header_bytes))[0]
return _get_block(s, count-header_bytes)
# Get Message Block
def _get_block(s, count):
if count <= 0:
return ''
buf = ''
while len(buf) < count:
buf2 = s.recv(count - len(buf))
if not buf2:
# error or just end of connection?
if buf:
raise RuntimeError("underflow")
else:
return ''
buf += buf2
return buf
#####################################
### INITIALIZE MAP
m = initMap();
#####################################
### START SOCKET
raw_input("Press Enter to start socket connection...")
print ''
# Connect to Socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_URL, TCP_PORT))
# Socket Authentication
msg_authenticate_o = json.dumps(msg_authenticate)
print msg_authenticate_o
print ''
s.send(msg_authenticate_o)
# Start Getting Messages...
while True:
# Get Message from Socket
payload = get_msg(s)
# Convert to JSON object
payload_o = json.loads(payload)
print payload_o
print ''
# Check if strike, then...
# NOTE: This is a crude way to validate a data payload vs a keep-alive payload.
if 'latitude' in payload_o:
# PLOT LIGHTNING STRIKE
plotStrike(m,payload_o)