[time-nuts] Imagery position accuracy

[lists at lazygranch.com]

Eh, I just recalled the original question a day or so ago and was curious if any of the imagery services had statistics on their position accuracy. It was an interesting question.

This is the server with the marker data. 

http://www.ngs.noaa.gov/cgi-bin/ds_radius.prl



------Original Message------
From: Chris Albertson
To: lists at lazygranch.com
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Imagery position accuracy
Sent: May 5, 2013 7:21 PM

After you get the position, how does the OP (or anyone else) put the
location data into the Trimble GPS receiver so that it can be used in
the time solution.  This is for NTP remember.

Assuming there is some way, will the Trimble GPS receiver "remember"
the location over a power cycle?

In other words, is there a way to program a Trimble receiver to NOT do
the self-survey on power up and instead to use some survey location
you got by some other method, like possibly hiring a survey team.

If there is a why to make that work, I might even modify the NTP
driver to do it.



On Sun, May 5, 2013 at 7:01 PM,  <lists at lazygranch.com> wrote:
> Bing birdseye tech uses Pictometry. They have a few papers on their position accuracy. Perhaps conflicting papers. One shows the RMS error of 0.6ft. Another shows a 95% confidence level at 2.8ft. This is on 4 inch resolution imagery.
>
> In any event, if your city uses the service, you possibly could get the planning department to provide accurate position data.
>
> http://www.pictometry.com/index.php?option=com_content&view=article&id=75&Itemid=84
>
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-- 

Chris Albertson
Redondo Beach, California