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Lrae
Master Wizard

Reged: 02/26/03
Posts: 4831
Loc: GooglePlex

Night and Day over Western Europe

#975 - 03/27/03 12:19 PM

View in Google Earth View in Google Maps (17259 downloads)

How was this overlay made?

Want to learn more about what you are seeing with Earthviewer? Can we really "See" the ocean floors? How was the "Night Sky" overlay made? Why some vegatation looks bright and others look dark? Then take a look at this page.

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Edited by Lrae (05/13/06 09:41 AM)

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sevenofnine
Tourist

Reged: 08/09/03
Posts: 104
Loc: Virginia

Re: Night and Day over Western Europe

[Re: Lrae]
#6274 - 11/09/03 07:53 AM

Nice overlay and nice article.

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ScottSEA
Tourist

Reged: 07/05/05
Posts: 12
Loc: Seattle, WA

Re: Night and Day over Western Europe

[Re: Lrae]
#38666 - 07/09/05 11:50 PM

One question I wasn't able to answer: how was a 2-d image formed that looks right when you overlay it on a 3d object?

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obrian
Tourist

Reged: 09/01/05
Posts: 47
Loc: Germany

Re: Night and Day over Western Europe

[Re: ScottSEA]
#360710 - 03/24/06 06:12 PM

Quote:

One question I wasn't able to answer: how was a 2-d image formed that looks right when you overlay it on a 3d object?

That is indeed a simple question with a complex answer. The keyword is "projection". I could just say, "by bending and stretching it properly", but that wouldn't do justice to the enormous amount of mathematical effort involved.

If you are really interested, you could start with some of these Wikipedia articles:
http://en.wikipedia.org/wiki/Map_projection
http://en.wikipedia.org/wiki/3D_projection
http://en.wikipedia.org/wiki/Graphical_projection
http://en.wikipedia.org/wiki/Texture_mapping

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oneida_val
Tourist

Reged: 09/27/05
Posts: 21
Loc: Texas

Re: Night and Day over Western Europe

[Re: sevenofnine]
#374409 - 04/03/06 08:58 PM

Why is it especially bright over west Africa near Benin ( which they say is the birthplace of voodoo, by the way).

Does it have something to do with the natural gas they have burning in the area?

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oneida_val
Tourist

Reged: 09/27/05
Posts: 21
Loc: Texas

Re: Night and Day over Western Europe

[Re: oneida_val]
#379029 - 04/08/06 12:32 AM

Wellllll....! Is anyone going to answer my question???

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cellorando
First Post

Reged: 04/02/06
Posts: 1

Re: Night and Day over Western Europe

[Re: Lrae]
#438257 - 06/07/06 01:12 PM

The image is flat photo. Check it out:

earthobservatory.nasa.gov/Newsroom/NewImages/Images/LivingEarth.jpg

Here is the whole kml file:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://earth.google.com/kml/2.0">
<GroundOverlay>
<name>975-LivingEarth</name>
<description>Image Provided be NASA</description>
<Icon>
<href>http://earthobservatory.nasa.gov/Newsroom/NewImages/Images/LivingEarth.jpg</href>
</Icon>
<LatLonBox>
<north>72.11104431</north>
<south>0.12550754</south>
<east>29.83491064</east>
<west>-42.25036685</west>
</LatLonBox>
</GroundOverlay>
</kml>

Google must have a way to just lay it over the given location. There is something called GeoTIFF. Geo data is embedded in the TIFF image. JPG also has a way to embed info, but I haven't heard of geographic data being included in that.

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marcfx51
Tourist