Validating KML geometries with Python

Question

I have a CSV file where in a column there are some KML geometries. These geometries can be points, lines, polygons etc. I would like to validate them and check if they are correctly written.

I'm reading the CSV with Pandas

import pandas as pd

csv = read_csv('file.csv')

#Let's take into account just the first location
coordinates = csv.['location'].loc[0] 

coordinates would be:

<Point><coordinates>2.34880,48.85341</coordinates></Point>

I tried to proceed with fastKML, but it searches for a complete KML file to check and not just the string I got.

So I'm wondering, is there any possibility of validating directly the sting?

Answer 1

Perhaps wrap it into a complete KML string for a simple placemark, then parse it with fastkml from_string:

e.g.

import pandas as pd
csv = read_csv('file.csv')

#Let's take into account just the first location
coordinates = csv.['location'].loc[0] 

kml_template = """
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Placemark>
    <name></name>
    <description></description>
    {}
  </Placemark>
</kml>
"""

k = kml.KML()
k.from_string(kml_template.format(coordinates))

Answer 2

This is possible with fastkml >= 1.1

>>> from fastkml import Point
>>> p = Point.from_string('<Point><coordinates>2.34880,48.85341</coordinates></Point>')
>>> p
fastkml.geometry.Point(ns='{http://www.opengis.net/kml/2.2}', name_spaces={'kml': '{http://www.opengis.net/kml/2.2}', 'atom': '{http://www.w3.org/2005/Atom}', 'gx': '{http://www.google.com/kml/ext/2.2}'}, id='', target_id='', extrude=None, altitude_mode=None, kml_coordinates=fastkml.geometry.Coordinates(ns='', name_spaces={'kml': '{http://www.opengis.net/kml/2.2}', 'atom': '{http://www.w3.org/2005/Atom}', 'gx': '{http://www.google.com/kml/ext/2.2}'}, coords=[(2.3488, 48.85341)], **{},), **{},)
>>> p.geometry
Point(2.3488, 48.85341)
>>> print(p)
<kml:Point xmlns:kml="http://www.opengis.net/kml/2.2">
  <coordinates>2.3488,48.85341</coordinates>
</kml:Point>

Fastkml 1.0.0 needs the namespace to be declared, e.g:

from fastkml import Point
p='<Point xmlns="http://www.opengis.net/kml/2.2"><coordinates>2.34880,48.85341</coordinates></Point>'
Point.from_string(p)
Point.from_string(p).validate()

or you can wrap it into a Placemark with the namespace:

from fastkml import Placemark
p="<Point><coordinates>2.34880,48.85341</coordinates></Point>"
pm=f'<Placemark xmlns="http://www.opengis.net/kml/2.2">{p}</Placemark>'
Placemark.from_string(pm)
Placemark.from_string(pm).validate()

Answer 3

@ehi answered their own question.

With the tip from @user2856 I manage to check the geometry.

kml_start = "<kml xmlns='http://www.opengis.net/kml/2.2'><Placemark><name>Simple placemark</name><description>Test.</description>'"
kml_end = "</Placemark></kml>"
kml_test = kml_start+str(coordinates)+kml_end

try:
    k = kml.KML()
    k.from_string(kml_test)
    print("geometry")
except:
    errors += 1
    print("Error, no Geometry")