How to access specific latitude and longitude off kml tag?

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How to access specific latitude and longitude off kml <coordinate> tag?

I am trying to organize the longitudes and latitudes of a .kml file into two separate arrays- one for the longitudes and one for the latitudes. I can access the coordinates in the .kml tag in my .kml file, as shown here:

>>> print root.Document.Placemark.Polygon.outerBoundaryIs.LinearRing.coordinates


-66.88943028804978,18.36088172088213,0 -66.86666454770418,18.34807414584603,0 -66.87505121318034,18.32676800819395,0 -66.85010093893582,18.35136710854946,0 -66.86795531478315,18.36533631930146,0 -66.88943028804978,18.36088172088213,0

-66.88943028804978,18.36088172088213,0 -66.86666454770418,18.34807414584603,0 -66.87505121318034,18.32676800819395,0 -66.85010093893582,18.35136710854946,0 -66.86795531478315,18.36533631930146,0

-66.88943028804978,18.36088172088213,0

Now I want to put them in an array, or at least access the x and y values of each coordinate separatly. I've tried typing:

print root.Document.Placemark.Polygon.outerBoundaryIs.LinearRing.coordinates[1]


But I get back this error:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "lxml.objectify.pyx", line 297, in lxml.objectify.ObjectifiedElement.__getitem__ (src/lxml/lxml.objectify.c:4234)
IndexError: 1


How do I get around this? How do I access the x and y values individually?
Cheers!! O.Fried

I got it guys! I made it a string then split it. If anyone wants me to explain more just say so!
– O. Fried
2 days ago

1 Answer
1

Assuming your KML is formatted like this, here is a complete example to parse a KML file and extract its coordinates.

from pykml import parser
import re
kml_str = '<kml xmlns="http://www.opengis.net/kml/2.2">'
'<Document>'
'<name>tennis-poly</name>'
'<Placemark>'
'<name>red</name>'
'<Polygon>'
'<outerBoundaryIs>'
'<LinearRing>'
'<coordinates>'
'-122.43193945401,37.801983684521 '
'-122.431564131101,37.8020327731402 '
'-122.431499536494,37.801715236748 '
'-122.43187136387,37.8016634915437 '
'-122.43193945401,37.801983684521'
'</coordinates>'
'</LinearRing>'
'</outerBoundaryIs>'
'</Polygon>'
'</Placemark>'
'</Document>'
'</kml>'

kml = parser.fromstring(kml_str)
coords = kml.Document.Placemark.Polygon.outerBoundaryIs.LinearRing.coordinates.text
for s in re.split("[ nr]+", coords.strip()):
coord = s.split(",", 3)
# note altitude is the third optional component in a tuple
print "lon=",coord[0], "tlat=",coord[1]


This would output:

lon= -122.43193945401 lat= 37.801983684521
lon= -122.431564131101 lat= 37.8020327731402
lon= -122.431499536494 lat= 37.801715236748
lon= -122.43187136387 lat= 37.8016634915437
lon= -122.43193945401 lat= 37.801983684521


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