[GeoStL] Re: Perfection is hard to achieve
- From: "Jim Bensman" <junkmailno@xxxxxxxxxxx>
- To: <geocaching@xxxxxxxxxxxxx>
- Date: Wed, 2 May 2007 18:44:44 -0500
-
I can tell you from experience GE is very accurate. Sometimes with my
Garmin trail maps I will trace trails that show up on GE and then put them
on the trail map. When I have checked it in the field, while it is not as
accurate as GPSing it myself, it is usually just a few feet off. Sometimes
I will trace water to add to topo maps and it also tends to be right on.
Sometimes for my maps I will also locate buildings with GE and add them to
the map and they are always right on.
Jim Bensman
"Nature Bats Last"
> -----Original Message-----
> From: geocaching-bounce@xxxxxxxxxxxxx [mailto:geocaching-
> bounce@xxxxxxxxxxxxx] On Behalf Of Robert Oelschlaeger
> Sent: Wednesday, May 02, 2007 6:28 PM
> To: geocaching@xxxxxxxxxxxxx
> Subject: [GeoStL] Re: Perfection is hard to achieve
>
> -
> 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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Missouri Caches Scheduled to be Archived http://tinyurl.com/87cqw
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