[gdal-dev] KMLSuperOverlay in Google Earth

Kyle Shannon KShannon at gcs-research.com
Fri Nov 18 11:37:04 EST 2011

Strange that turning on "Tools->Options->General->KML Error Handling->Show prompts for all errors" doesn't report anything.

From: gdal-dev-bounces at lists.osgeo.org [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of Kyle Shannon
Sent: Friday, November 18, 2011 9:14 AM
To: Roland Duhaime; gdal-dev at lists.osgeo.org
Subject: RE: [gdal-dev] KMLSuperOverlay in Google Earth

Possible issue with output (from http://earth.google.com/support/bin/answer.py?answer=40901):

To conform more closely with the OGC KML 2.2 standard, we've made the parsing of the <coordinates> tag more strict in version 6.1. Spaces must only be used to separate the (longitude,latitude,altitude) triplets which specify the coordinates of a single point. It is invalid to add spaces between individual coordinates. We understand that previous versions of the client were more lenient, so if your KML files contain spaces beween coordinates in coordinate triplets, an easy workaround is to remove all whitespace located immediately before or after commas inside a <coordinates> tag.

I checked one file, and there were spaces after the commas:

<kml xmlns="http://earth.google.com/kml/2.1" xmlns:gx="http://www.google.com/kml/ext/2.2">
                <ListStyle id="hideChildren">
                           12.492253, 41.890160, 0
                           12.506078, 41.890461, 0
                           12.505676, 41.900791, 0
                           12.491848, 41.900490, 0

Seems like a quick fix.  Someone should probably file a ticket for documentation, I can do that if need be.


From: gdal-dev-bounces at lists.osgeo.org [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of Roland Duhaime
Sent: Friday, November 18, 2011 7:14 AM
To: gdal-dev at lists.osgeo.org
Subject: Re: [gdal-dev] KMLSuperOverlay in Google Earth


The PNG gdalinfo details are:

Driver: PNG/Portable Network Graphics
Files: 7.png
Size is 218, 218
Coordinate System is `'
Image Structure Metadata:
Corner Coordinates:
Upper Left  (    0.0,    0.0)
Lower Left  (    0.0,  218.0)
Upper Right (  218.0,    0.0)
Lower Right (  218.0,  218.0)
Center      (  109.0,  109.0)
Band 1 Block=218x1 Type=Byte, ColorInterp=Red
Band 2 Block=218x1 Type=Byte, ColorInterp=Green
Band 3 Block=218x1 Type=Byte, ColorInterp=Blue
Band 4 Block=218x1 Type=Byte, ColorInterp=Alpha


On Thu, Nov 17, 2011 at 5:21 PM, Roger André <randre at gmail.com<mailto:randre at gmail.com>> wrote:
What is the output of gdalinfo on one of the PNG's in the superoverlay?

On Thu, Nov 17, 2011 at 1:36 PM, Roland Duhaime <roland.duhaime at gmail.com<mailto:roland.duhaime at gmail.com>> wrote:

Has anyone else experienced the latest version of Google Earth ( or the G.E. API not loading PNG formatted KMLSUPEROVERLAYs created using gdal_translate?  The same KMZ files worked in the past.


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