Geo::KML - produce GoogleEarth KML/KMZ files
Geo::KML is a XML::Compile::Cache
use Geo::KML; my $kml = Geo::KML->new(version => '2.2.0'); $kml->writeKML($data, $filename); my ($ns, $data) = Geo::KML->from('a.kmz'); defined $ns && $ns eq NS_KML_21 or die "don't understand file content\n";
KML is the information format for GoogleEarth, an abbreviation of Keyhole Markup Language. Keyhole was the company bought by Google, which had developed the initial version of the GoogleEarth browser. The first version of KML used XML without specs, but version 2 has clean schemas to it. Very complex schemas.
This module is intended to grow with knowledge and features about KML. Please contribute algorithms. It would be nice to have transformations between KML specifications and pleasant abstract objects.
WARNING: in reality, the GoogleEarth application is very forgiving for the message structure, for instance the order of elements and field validation. XML::Compile, the base for this module, is not: it sticks strict to the schema as XML requires. So: reading kml files may not always work, even when the GoogleEarth application accepts it.
WARNING: KML can also be used as layer in GoogleMaps, although that does not support all the features (yet) For maps, the google cloud is used to translate KML into the JSON which the maps browser can handle. See http://code.google.com/apis/kml/documentation/kmlelementsinmaps.html
Methods writeKML() and
from() respectively produce and decode KML files. The Perl data structure to be used differs seriously between different KML releases; the KML file is close to the same, however KML 2.2 schemas use a layered type system which will show itself in Perl.
The easiest way to start, is to decode examples first. Go to http://code.google.com/apis/kml/documentation/kmlreference.html and look for suitable examples. Then
use Geo::KML; my $data = Geo::KML->from("example.kml"); use Data::Dumper; $Data::Dumper::Indent = 1; print Dumper $data;
Also, take a look in the examples directory of this distribution.
-Option --Default compression <filename dependent> format <depends> version <required>
The compression to be used to write the KMZ ZIP-archives. 9 is best, 0 means uncompressed. The default is 6. See the COMPRESSION_LEVEL_* constants defined by Archive::Zip.
Output format. A value of '0' means: as compact as possible. When compression is on, then the default is '0' (compact), otherwise '1' (readable).
Which version of KML to read and/or write.
The level of compression (-1, 0..8) for the writer. The optional BOOLEAN changes the setting.
The output format. With '0', it is optimally compact.
KML version, for instance '2.2.0'.
[release 0.03] Read KML from a source, which can be anything XML::Compile subroutine dataToXML accepts: filename, filehandle, scalar, and more. Returned is a list of two: the type of the KML structure and it parsed content.
You call use ALL options which are provided by XML::Compile::Schema subroutine compile, for instance
-Option --Default is_compressed <auto>
When possible, automatically detected from the XMLDATA. However, when the XMLDATA is a file-handle, you may need to set this flag.
my ($ns, $data) = Geo::KML->from('/tmp/a.kml'); my ($ns, $data) = Geo::KML->from(\*STDIN, is_compressed => 1); if($ns eq NS_KML_220) ...
If ZIPPED is true, or the filename ends with "kmz", a zip archive will get produced. That archive will contain a single
doc.kml file. Returned is the MIME-type of the produced data. which is either MIME_KML or MIME_KMZ (when zipped)
You may skip the top-level Document element in the DATA structure.
This module is part of Geo-KML distribution version 0.94, built on August 28, 2012. Website: http://perl.overmeer.net/geo-kml All modules in this suite: "Geo::Point", "Geo::Proj4", "Geo::WKT", "Math::Polygon", "Geo::GML", "Geo::ISO19139", "Geo::EOP", "Geo::Format::Envisat", and "Geo::Format::Landsat".
Please post questions or ideas to the mailinglist at http://firstname.lastname@example.org
Copyrights 2008-2012 by [Mark Overmeer]. For other contributors see ChangeLog.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See http://www.perl.com/perl/misc/Artistic.html