Re: Offset threshold problem

David Megginson wrote:

> Erik Hofman wrote:
>
>> For what I've seen so far the STRM data incorporates terrain 
>> elevation due to stables, farm houses, trees (or rather small woods), 
>> tall buildings, etc.
>>
>> So in reality the data is too accurate for our needs.
>
>
> That is correct -- once we go below 3 arcsec, we'll start seeing large 
> hills in urban areas that are really skyscrapers, etc.


We also see a lot of noise in the data even at 3 arcsec resolution ... 
They had a  huge antenna (60m) that they extended from the shuttle.

    http://www.shuttlepresskit.com/STS-99/payload57.htm

This had a natural oscillation that shows up in the data as well.  They 
had some scheme for trying to account for or correct for this, but 
perhaps that didn't work out as well as they hoped, or no one managed to 
figure out the math?

Curt.

-- 
Curtis Olson        http://www.flightgear.org/~curt 
HumanFIRST Program  http://www.humanfirst.umn.edu/
FlightGear Project  http://www.flightgear.org
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