Last active
August 29, 2015 14:06
-
-
Save privong/63ac04c6287fb9612b50 to your computer and use it in GitHub Desktop.
Earthquake checker
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/usr/bin/env python | |
# Load the daily USGS atom feed and see if there are any earthquakes within | |
# a specified distance of a specified location | |
import feedparser | |
import argparse | |
import math | |
import sys | |
# compute the great circle distance using the haversine formula | |
def GreatCircDist(loc1, loc2): | |
dlat = loc2[0] - loc1[0] | |
dlong = loc2[1] - loc1[1] | |
rdlat = math.radians(dlat) | |
rdlong = math.radians(dlong) | |
ha = math.sin(rdlat/2) * math.sin(rdlat/2) + \ | |
math.cos(math.radians(loc1[0])) * \ | |
math.cos(math.radians(loc2[0]))*math.sin(rdlong/2) * \ | |
math.sin(rdlong/2) | |
hc = 2 * math.atan2(math.sqrt(ha), math.sqrt(1-ha)) | |
return 6378.1*hc | |
parser = argparse.ArgumentParser(description="Load the daily USGS atom feed \ | |
and see if there are any earthquakes within a specified distance of \ | |
a specified location.") | |
parser.add_argument('-l', type=float, default=False, | |
help='Latitude of interest.') | |
parser.add_argument('-g', type=float, default=False, | |
help='Longitude of interest.') | |
parser.add_argument('-d', type=float, default=False, | |
help='Radius of interest (in km).') | |
args = parser.parse_args() | |
if not(args.l and args.g and args.d): | |
sys.stderr.write("Error. Incorrect arguments. Exiting.\n") | |
sys.exit(1) | |
usgs = feedparser.parse('http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.atom') | |
number = 0 | |
for entry in usgs['entries']: | |
pos = [float(x) for x in entry['georss_point'].split()] | |
dist = GreatCircDist([args.l, args.g], pos) | |
if args.d > dist: | |
number += 1 | |
sys.stdout.write( | |
entry['title'].split(' -')[0] + ' earthquake ' + | |
'{0:0.0f}'.format(dist) + ' km away,' + | |
entry['title'].split('-')[1] + ' (' + | |
str(pos[0]) + ', ' + str(pos[1]) + ') at an elevation of ' + | |
'{0:0.1f}'.format(float(entry['georss_elev'])/1000.) + | |
'km.\n') | |
if not(number): | |
sys.stdout.write('No earthquakes within ' + str(args.d) + ' km of (' + | |
str(args.l) + ', ' + str(args.g) + ') in the past 24h.\n') | |
else: | |
sys.stdout.write('\n' + str(number) + ' earthquake') | |
if number != 1: | |
sys.stdout.write('s') | |
sys.stdout.write(' within ' + | |
str(args.d) + ' km of (' + str(args.l) + ', ' + | |
str(args.g) + ') in the past 24h.\n') |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment