How to map StreetPilot III latitude/longitude on Google maps?

wrote:


See
http://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system
--
Alan White
Mozilla Firefox and Forte Agent.
Twenty-eight miles NW of Glasgow, overlooking Lochs Long and Goil in Argyll,
Scotland.
Webcam and weather:- http://windycroft.gt-britain.co.uk/weather

One more point,, I entered a location (the center of my home),
which was established by post processing about 600 hours of raw GPS
data and noticed that Google Maps placed their marker about 50 feet
east of the established mark, (looking at the satellite photo)!!!
I also notice that some roads, etc., have an offset where Google maps
sometimes doesn't line up where they are spliced together,,, so,
there is room for some error on Google maps as well as other web maps
and photos!! Just an FYI in the event that your reading falls on
the other side of a river, or road, etc., on Google maps!!!
SKM

FWIW, Google Earth is notorius for being off from known positions, and the
amount varies from location to location. USAPhotoMaps is another application
(free) that uses aerial photography, but it is black and white, and
generally older images than Google. However, I have found it to be much more
accurate.. I think the URL is www.jdmcox.com.

On Sun, 19 Aug 2007 10:35:40 -0400, Cooter wrote:


USA Maps has color aerials, where they are available. Mostly Urban areas.



--
Frank Tabor
Q:        Why did the chicken cross the road?
A:        To see his friend Gregory peck.

Q:        Why did the chicken cross the playground?
A:        To get to the other slide.

Also, on those web sites where you can choose topo and photo I have
noticed, at least for my area, (N. Calif.), that the placement of
survey markers on the topos, (the red lines township grids), as
compared to the locations where I have actually found them on the
photos, are off by as much as 100 feet or more??????

I discovered that for Colorado Springs (at least) the new high res
color photos are way off the older B &W photos by a couple hundred
meters or more,,,,, I think it was Terra Server???? I sent them
an email and never got a response,, I don't live there, I have
friends there, so I haven't bothered to check if they have been
corrected???? Any reason to offset them for privacy, or security,
etc., would be laughable!!!!

I've noticed that Globexplorer does a good job of matching the high
res photos to the old B & W but the topos are still off?????? I
haven't worked with USAphotos for a while,,,, there are now hi res
color photos for my area,, I'll have to try USAphotos again,,,,,
(as mentioned by Frank Tabor)!!!
SKM