It turns out that parsing this CDATA, without having an exact schema of the contents is not trivial.Įssentially these are the only free-text fields containing attributes related to the placemrk. Opening the KML file with GOOGLE EARTH shows the typical placemark symbols (pushpins) scattered along the Nile Riverįrom this example, we can see that the section is fairly straightforward, but that the is problematic because it includes a great deal of or or other elements within the CDATA section. In this module we will demonstrate the basic use of KML in QGIS and a few tricks that will make it possible to store attributes (in a separate spreadsheet) and join them to the correct spatial features.Ī quick search for KML of Egypt found some layers of Egyptian Pyramids. However, there are some particular aspects of the KML notation that make it less than optimal for data entry, especially for the annotation of spatial features (aka "placemarks") with attributes, as we expect to do in GIS.
Since KML files can be created using the free (and relatively easy to use) Google Earth software, it has become quite popular. The KML technology was purchased by Google in 2004, and became the main format used by the Google Earth application. In our exercise, we will prefer the KML format, which we can view and manipulate as needed. KMZ is a compressed version of the KML to save disk space and transfer time. KML is a "flat text" format which can be read and edited with an ordinary text editor. Head on over to the pyKML Examples section of the documentation.KML and KMZ files ( Keyhole Markup Language) are stored in an XML notation designed for visualizing and annotating geographic information. For further examples of how pyKML can be used, getroot () In : script = write_python_script_for_kml_document ( doc ) In : print script from lxml import etree from pykml.factory import KML_ElementMaker as KML from pykml.factory import ATOM_ElementMaker as ATOM from pykml.factory import GX_ElementMaker as GX doc = KML.kml( etree.Comment(' required when using gx-prefixed elements '), KML.Placemark( KML.name('gx:altitudeMode Example'), KML.LookAt( KML.longitude('146.806'), KML.latitude('12.219'), KML.heading('-60'), KML.tilt('70'), KML.range('6300'), GX.altitudeMode('relativeToSeaFloor'), ), KML.LineString( KML.extrude('1'), GX.altitudeMode('relativeToSeaFloor'), KML.coordinates( '146.825,12.233,400' '146.820,12.222,400' '146.812,12.212,400' '146.796,12.209,400' '146.788,12.205,400' ), ), ), ) print etree.tostring(etree.ElementTree(doc),pretty_print=True) In : from pykml.factory import write_python_script_for_kml_document In : url = '' In : fileobject = urllib2. 29 """ -> 30 return (doc) 31 32 def fromstring(text, schema=None): /home/tylere/.virtualenvs/pykml-doc/lib/python2.7/site-packages/lxml/etree.so in lxml.etree._Validator.assertValid (src/lxml/:125415)() DocumentInvalid: Element 'snippet ).
assertValid ( doc ) - DocumentInvalid Traceback (most recent call last) /home/tylere/Dropbox/project/pykml/docs/ in () /home/tylere/Dropbox/project/pykml/src/pykml/parser.pyc in assertValid(self, doc) 28 when compared to the XML Schema. # validate against the OGC KML schema, and generate an exception In : schema_ogc.