Subject: Re: [BoundaryPoint] Re: Topozone Discrepancies
Date: May 15, 2001 @ 22:29
Author: michael donner (michael donner <m@...>)
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hey
we climbed lake okeechobee
didnt we

http://home.wanadoo.nl/~eefberns/gp-frsp400-achterkant.jpg
was the actual background as i recall
isnt that right bill

m


>
>Since you are in Florida, I have to ask - what terrain?
>
>BJB
>--- In BoundaryPoint@y..., Bill Hanrahan <hanrahan@k...> wrote:
>> Good to hear...in most cases (depending on terrain) resolution to
>the
>> nearest second generally suffices for me anyway.
>>
>> Bill
>>
>> bjbutler@b... wrote:
>>
>> > See message 2444, but basically I think you will be OK if you use
>> > only the geocoordinates and not the UTM coordinates displayed by
>> > topozone.
>> >
>> > BJB
>> >
>> > --- In BoundaryPoint@y..., Bill Hanrahan <hanrahan@k...> wrote:
>> > > Thanks Bryan. It will be interesting to see what their response
>> > will
>> > > be. I've also been relying on Topozone on the job...
>> > >
>> > > Bill
>> > >
>> > > bjbutler@b... wrote:
>> > >
>> > > > Anyone using www.topozone.com to acquire GPS coordinates
>should be
>> >
>> > > > aware that they are using a mixture of NAD27 and NAD83 UTM
>> > > > coordinates, but there is no way to tell which is which. They
>> > > > believe all coordinates are NAD27. However, last week I
>relied on
>> >
>> > > > this misinformation during a bushwhack from the Delaware Arc
>> > monument
>> > > > to the Delaware - Maryland - Pennsylvania tri-point and ended
>up
>> > in a
>> > > > hay field 200 meters north of the tri-state monument. Using
>the
>> > same
>> > > > target coordinates, but interpreting them using the NAD83
>datum
>> > > > yields the correct result.
>> > > >
>> > > > I have contacted topozone about this problem.
>> > > >
>> > > > Regards,
>> > > > BJB
>> > > >
>> > > >
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