[gdal-dev] KMZ Support in OGR?

[Simon Perkins]

Brian Hamlin wrote:
> On Mar 28, 2008, at 10:06 AM, Simon Perkins wrote:
>
>>  Thanks - that would seem like a good way to go in the future, though 
>> I don't have time to work on it myself...
>
> that may be a common story !
>
> the relatively light weight discussion of this that I have heard so 
> far basically comes to a conclusion that since OGR writes out a pretty 
> simple KML, its not worth doing the work of bringing in the new libkml 
> to do that.
>
> Its worth noting that the Simple Features Library (that OGR is based 
> on) only goes so far in mapping to KML.
>
> as for kmz, thats trivial.. just pipe the output to a zip program, y?

Well, it would be nice to have something that was integrated into OGR,
without having to mess around with external programs.

I think rewriting the KML driver to use the google library would be a
great idea. The current KML driver has a number of limitations - for
instance, it doesn't support reading of multi-geometries (though I think
it will write them).

Cheers,

Sy




>
>>  As I understand it, the BSD license allows free distribution and use 
>> of source code and binaries, with or without modifications. The only 
>> caveats are that (a) you mustn't remove the copyright notices from 
>> the source code, (b) you must acknowledge the copyright somewhere in 
>> the documentation of your library / app that uses the code, and (c) 
>> you mustn't assert that the author of the original code endorses the 
>> derived library / application. Is this compatible with the GDAL 
>> license? Maybe the google people would be flexible if it isn't?
>>
>>  Wouldn't this make a perfect Google Summer of Code project? Can 
>> someone add it to the GDAL SoC ideas page?
>>
>>  Cheers,
>>
>>  Sy
>>
>>
>>  Clay, Bruce wrote:
>> I don't know what KMZ support is in the current GDAL KML but I
>> downloaded the libKml package from http://code.google.com/p/libkml/  and
>> it has KMZ support built in.  If anyone was going to look at an update
>> for GDAL / OGR they might want to look at that library.  The notes on
>> the website indicate that libKml is "an implementation of the candidate
>> OGC KML 2.2 standard".
>>
>> A potential snag is that the Google library is under the BSD open source
>> license.  I don't keep track of the differences in license types so I
>> can't say if one is better than the other.
>>
>> Bruce
>>
>>
>> -----Original Message-----
>> From: gdal-dev-bounces at lists.osgeo.org
>> [ mailto:gdal-dev-bounces at lists.osgeo.org ] On Behalf Of Tamas Szekeres
>> Sent: Friday, March 28, 2008 1:24 PM
>> To: Simon Perkins
>> Cc: gdal-dev at lists.osgeo.org
>> Subject: Re: [gdal-dev] KMZ Support in OGR?
>>
>> Simon,
>>
>> I'm not sure whether the zip file record structure is implemented in
>> zlib or not. If the latter is the case implementing this would be
>> slightly beyond the scope of GDAL. There are several projects out
>> there to provide such API for various kind of languages.
>>
>> Best regards,
>>
>> Tamas
>>
>>
>>
>> 2008/3/28, Simon Perkins <sy at perkins.net> :
>>
>> Hi,
>>
>>  Does the OGR KML driver support reading and/or writing of KMZ files?
>>
>>  KMZ files are simply zipped KML files which allow smaller file sizes
>>
>> and
>>
>>  bundling of multiple files in one package. I think that google earth
>>  uses the format by default.
>>
>>  Since GDAL already includes zlib, I would think that adding support
>>
>> for
>>
>>  this would be pretty simple, if it's not there already. Anyone
>>
>> planning
>>
>>  on doing this?
>>
>>  Cheers,
>>
>>  Simon
>>
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