Export Raster to Google Earth Files

[Andrew Lewin]

Hi Everyone,

I would like to export raster files to a Google Earth image (kmz or  
kml).  Does anyone know how this is done?  I found a way to export a  
vector to a kmz file, but not a raster.

Your help is very much appreciated.

Best,

Andrew

Andrew Lewin, M.Sc., Adv. Dipl. GIS
Email: [hidden email]
Tel: [phone]
Mobile: [phone]
Skype: andrew.lewin99

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[hamish-2]

Andrew wrote:
> I would like to export raster files to a Google Earth image
> (kmz or kml).  Does anyone know how this is done?
> I found a way to export a vector to a kmz file, but not a
> raster.

try  http://grass.osgeo.org/wiki/GRASS_AddOns#r.out.gmap


easier:
I think you just have to export a geotiff then compose the KM? file
manually with the bounds.


Hamish




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[John A Stevenson]

Hamish wrote:
> easier:
> I think you just have to export a geotiff then compose the KM? file
> manually with the bounds.
>  
Or you can use gdal2tiles.py to do this bit.  It will also create
different zoom levels for you.

More information on a previous posting:

http://lists.osgeo.org/pipermail/grass-user/2009-May/050361.html

John

--


Dr John Stevenson
Postdoctoral Research Associate
School of Earth, Atmospheric and Environmental Sciences
Williamson Building (Room 2.42)
University of Manchester
Manchester M13 9PL, UK
tel. [phone]; fax. [phone];
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[Roger André]

The easiest way to do this for 1 or 2 reasonably sized rasters is to
simply write a very short KML file that points to the image name and
defines its geographic extents.  If you have to do it for hundreds of
files, then scripting it is much faster.  I can send you a short Perl
script that uses gdalinfo to determine the extents.  Here is what the
KML should look like:

<GroundOverlay>
<description>Something pithy</description>
<name>Something else pithy</name>
<visibility>1</visibility>
<open>1</open>
<Icon>
<href>"name_of_image_file"</href>
</Icon>
<drawOrder>0</drawOrder>
<LatLonBox>
<north>  DD.dddd</north>
<south>  DD.dddd</south>
<west> DD.dddd</west>
<east> DD.dddd</east>
</LatLonBox>
</GroundOverlay>

Roger
--

On Tue, Oct 13, 2009 at 11:14 AM, Andrew Lewin
<[hidden email]> wrote:

> Hi Everyone,
>
> I would like to export raster files to a Google Earth image (kmz or kml).
>  Does anyone know how this is done?  I found a way to export a vector to a
> kmz file, but not a raster.
>
> Your help is very much appreciated.
>
> Best,
>
> Andrew
>
> Andrew Lewin, M.Sc., Adv. Dipl. GIS
> Email: [hidden email]
> Tel: [phone]
> Mobile: [phone]
> Skype: andrew.lewin99
>
> _______________________________________________
> grass-user mailing list
> [hidden email]
> http://lists.osgeo.org/mailman/listinfo/grass-user
>

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[hamish-2]

Andrew wrote:
> > I would like to export raster files to a Google Earth
> > image (kmz or kml).
> >  Does anyone know how this is done?  I found a way
> > to export a vector to a kmz file, but not a raster.

Roger André wrote:
> The easiest way to do this for 1 or 2 reasonably sized rasters
> is to simply write a very short KML file that points to the
> image name and defines its geographic extents.  If you have to
> do it for hundreds of files, then scripting it is much
> faster.
...

> Here is what the KML should look like:
>
> <GroundOverlay>
> <description>Something pithy</description>
> <name>Something else pithy</name>
> <visibility>1</visibility>
> <open>1</open>
> <Icon>
> <href>"name_of_image_file"</href>
> </Icon>
> <drawOrder>0</drawOrder>
> <LatLonBox>
> <north>  DD.dddd</north>
> <south>  DD.dddd</south>
> <west> DD.dddd</west>
> <east> DD.dddd</east>
> </LatLonBox>
> </GroundOverlay>

based on this template I've added a r.out.kml script in addons
SVN to do that.

https://trac.osgeo.org/grass/browser/grass-addons/raster/r.out.kml


TODO:
 - completely untested
 - g.region -n is broken in at least devbr6 (trac #791) so
   export only works from LL/WGS84 right now
 - pythonization
 - add a -k flag to d.out.file to write a KML file (test true north angle(s)!)

comments/testing/suggestions welcome.


Hamish




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[Roger André]

lol  Awesome!  Can you imagine ESRI creating a utility this way?

Thanks for doing this.

Roger
--

On Fri, Oct 16, 2009 at 8:36 PM, Hamish <[hidden email]> wrote:

> Andrew wrote:
>> > I would like to export raster files to a Google Earth
>> > image (kmz or kml).
>> >  Does anyone know how this is done?  I found a way
>> > to export a vector to a kmz file, but not a raster.
>
> Roger André wrote:
>> The easiest way to do this for 1 or 2 reasonably sized rasters
>> is to simply write a very short KML file that points to the
>> image name and defines its geographic extents.  If you have to
>> do it for hundreds of files, then scripting it is much
>> faster.
> ...
>> Here is what the KML should look like:
>>
>> <GroundOverlay>
>> <description>Something pithy</description>
>> <name>Something else pithy</name>
>> <visibility>1</visibility>
>> <open>1</open>
>> <Icon>
>> <href>"name_of_image_file"</href>
>> </Icon>
>> <drawOrder>0</drawOrder>
>> <LatLonBox>
>> <north>  DD.dddd</north>
>> <south>  DD.dddd</south>
>> <west> DD.dddd</west>
>> <east> DD.dddd</east>
>> </LatLonBox>
>> </GroundOverlay>
>
> based on this template I've added a r.out.kml script in addons
> SVN to do that.
>
> https://trac.osgeo.org/grass/browser/grass-addons/raster/r.out.kml
>
>
> TODO:
>  - completely untested
>  - g.region -n is broken in at least devbr6 (trac #791) so
>   export only works from LL/WGS84 right now
>  - pythonization
>  - add a -k flag to d.out.file to write a KML file (test true north angle(s)!)
>
> comments/testing/suggestions welcome.
>
>
> Hamish
>
>
>
>
>

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