Traversing using State Plane Coordinates

[Brian McCain]

Here's the skinny,

I have set two pairs of GPS points approximately 3000 feet apart. I would
like for the field crew
to reduce their distances to grid to match my gps. In SurvCE, what is the
correct procedure for
traversing from one pair of GPS to the other pair and getting a good answer?
Tell me if I am wrong.
I go to the job settings screen and click on the units tab. I enter the
station point and tell it to
calculate the combined scale factor for that point then backsight. Then I
set a foresight point. Then
when I set up on that foresight point I calculate a new combined factor for
that point and so forth
and so on. Should I have to calculate a combined factor for the four points
and enter that in once, or
can I use the procedure outlined previously and let the collector calculate
a combined factor as I go???

Barkley, got your ears on? Help!!


Brian

[MIKE PRATT]

If I understand the question correctly you are trying to run a total
station traverse and adjust to known GPS grid coordinates.

I believe you would only want one combined scale factor that you can use
for the whole project. Unless you are in an area with a lot of vertical
relief, there shouldn't be much difference in 3000 feet. I believe SurvCE
is setup so that when you enter in a scale factor in the Units Tab, the
software will scale TS measurements down to grid or divide GPS coordinates
by the scale factor to scale them up to ground. i.e., in your case you
are trying to stay with grid coordinates, so when using GPS you will set
the scale factor to 1 and when using the total station you will set it to
your combined factor for the area.

I'm not sure how you would easily calculate your combined factor for each
point without the benefit of having GPS set up at each point. If you are
not using GPS, then you can use the Elevation Factor for your traverse and
rotate and translate your coordinates to match the GPS coords.

-Mike

Brian McCain wrote:

Here's the skinny,

I have set two pairs of GPS points approximately 3000 feet apart. I
would
like for the field crew
to reduce their distances to grid to match my gps. In SurvCE, what is
the
correct procedure for
traversing from one pair of GPS to the other pair and getting a good
answer?
Tell me if I am wrong.
I go to the job settings screen and click on the units tab. I enter the

station point and tell it to
calculate the combined scale factor for that point then backsight. Then
I
set a foresight point. Then
when I set up on that foresight point I calculate a new combined factor
for
that point and so forth
and so on. Should I have to calculate a combined factor for the four
points
and enter that in once, or
can I use the procedure outlined previously and let the collector
calculate
a combined factor as I go???

Barkley, got your ears on? Help!!

Brian

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[Terry Strickland]

I do like Mike says. I use one CSF per project. It shouldn't vary over
a hundredth or two in a mile unless you've got a LOT of elevation
difference.
terry

Brian McCain wrote:

Here's the skinny,

I have set two pairs of GPS points approximately 3000 feet apart. I would
like for the field crew
to reduce their distances to grid to match my gps. In SurvCE, what is the
correct procedure for
traversing from one pair of GPS to the other pair and getting a good answer?
Tell me if I am wrong.
I go to the job settings screen and click on the units tab. I enter the
station point and tell it to
calculate the combined scale factor for that point then backsight. Then I
set a foresight point. Then
when I set up on that foresight point I calculate a new combined factor for
that point and so forth
and so on. Should I have to calculate a combined factor for the four points
and enter that in once, or
can I use the procedure outlined previously and let the collector calculate
a combined factor as I go???

Barkley, got your ears on? Help!!


Brian