[GeoStL] Re: Perfection is hard to achieve
- From: "Robert Oelschlaeger" <roelschlaeger@xxxxxxxxx>
- To: geocaching@xxxxxxxxxxxxx
- Date: Wed, 2 May 2007 18:27:42 -0500
-
You are talking about the science of photogrammetry, and yes, they do take
all those things into account and a lot of other things that all of us at
SLAGA couldn't come up with in a month of Sundays, even if we took time out
from eating ;-) .
See this brief introduction to photogrammetry at
http://www.geodetic.com/Whatis.htm
Bob (aka roelsch)
On 5/2/07, Mike Lusicic <lusicic@xxxxxxxxxxxxx> wrote:
>
> -
> If you are talking about the service where GE puts caches on the map, then
> Ithink that there is a disclaimer about the accuracy not being very good.
> I
> have seen caches move around as you zoom in and out on GE.
> On the other hand, if you are manually entering the coordinates on a cache
> page, then those are the hider's coordinates, and GE isn't going to do
> anything to improve the situation. If anything, based on the disclaimer,
> it
> may introduce its own error.
>
> If you are looking at an aerial view and using landmarks to determine
> coordinates for a hide, I am not sure how accurate that is. They have
> impose
> coordinate over a photo, and depending on the area, the resolution isn't
> thatgreat, and depending on the angle the photo is taken, the scale isn't
> necessarily linear, so there will be some error introduced there, but I
> don'tknow how much. I think in the long run, the GPSr on location may be
> the
> best bet.
>
> BTW, those are not satellite views. They are taken from aircraft flying
> over
> the area.
>
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