Plot multiple lines in python/basemap

Question

I have just started learning python/matplotlib/basemap and could really use some help. How do you plot multiple lines?

Say my data looks something like:

[(lat1,lon1) (lat2,lon2) (lat3,lon3)]
[(lat1,lon1) (lat2,lon2) (lat3,lon3)]
[(lat1,lon1) (lat2,lon2) (lat3,lon3)]
...

I want to plot a separate line for each line in my data. What I get with my code, however, is that is connects the last point in the previous line to the first in the current line. Can anyone help me fix this? Thank you!

EDIT: Here is what I have for code:

for page in files:
    file = open(dir + '/' + page)
    for line in file:
       lines = line.split()
       time = lines[0]
       lon = lines[1]
       lat = lines[2]
       lon_float = float(lon)
       lat_float = float(lat)
       lats.append(lat_float)
       lons.append(lon_float)
    x,y = m(lons, lats)
    m.plot(x,y,'D-')
plt.show()

I want to plot one line for every file (which has multiple lat/long pairs) Also, m is my Baseplot instance

ah, see my edited answer. We were barking up the wrong tree;) — tacaswell
– tacaswell, Commented Jul 22, 2012 at 21:46

tacaswell · Accepted Answer · 2012-07-22 21:23:54Z

2

You are not clearing lats and lons so every time through the file loop you are accumulating the points.

for page in files:
    file = open(dir + '/' + page)
    lats = []
    lons = []
    for line in file:
        ...

EDIT: Completely re-wrote answer

edited Jul 22, 2012 at 21:23

answered Jul 22, 2012 at 20:12

tacaswell

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2 Comments

pelson Over a year ago

To help with clarity, the zip statements could be split into two lines: lats, lons = zip(*data) followed by plt.plot(lons, lats). I think the order of the lons and lats may need to be switched for @tcaswells example to work (but I can never remember with confidence).

peter_wx Over a year ago

Yes! That is exactly what I wanted! Thank you so much!! That make so much sense!

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