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google earth projection... WGS??

B

BrBlazer

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481
Hello,

What is the projection for google earth?

I downloaded USGS image in NAD projection, doesn't fit google earth, so I reprojected in Geographic and WGM84 like the fs resampler enjoys, but it also doesn't fit google.

How can I reproject USGS imagery so it matches google earths?

Kindly,

Blazer
 
Hi Blazer.

Google Maps uses a Spherical Mercator projection:

http://docs.openlayers.org/library/spherical_mercator.html

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Google Earth is a bit different. It will accept WGS84 lat-long as an input ( EPSG:4326 ), but it dynamically reprojects this data onto it's spherical surface.

Screenshots output from Google Earth are distorted because it is taking a view of a round surface... gives a bit of a fish-eye effect. I don't think there is an easy way to reproject this back to lat-long.

The sim uses WGS84 lat-long ( EPSG:4326 ), so that would be the common format. If all images are reprojected to that, then they should match.

Dick
 
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