CE Scale factor

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CE Scale factor

Postby Terry Strickland » Sun Jun 12, 2005 10:30 pm

I have a question regarding the scale factor in the units tab under job
settings. Should this be a combined scale factor (grid + elevation), or
just a grid scale factor, with the sea level correction turned on?
thanks,
terry strickland
Terry Strickland
 

Re: CE Scale factor

Postby Barkley Hensley » Tue Jun 14, 2005 5:28 pm

If you have and are using a combined scale factor, then the Sea Level
Correction should be OFF.


Terry Strickland wrote:

I have a question regarding the scale factor in the units tab under job
settings. Should this be a combined scale factor (grid + elevation), or
just a grid scale factor, with the sea level correction turned on?
thanks,
terry strickland
Barkley Hensley
 

Re: CE Scale factor

Postby Jason Hallett, PLS » Wed Jun 22, 2005 12:55 am

Terry,

Yes, you are correct. If the sea level correction is off, then it is the
Combined Factor. If the sea level factor is ON, then it is the GRID factor.
This Only applies to Total Stations though.

I typically recommend that you leave the Sea Level Correction off and
consider the Scale Factor a Combined Factor at all times.

Per the manual:

Scale Factor: For most applications, the Scale Factor should be set to 1.0.
The scale factor represents the "combined" grid/elevation factor that
reduces ground distances to grid. Therefore, for total stations, the scale
factor acts as a multiplier. All distance measurements, taken by a total
station will be multiplied by the scale factor. For GPS, the scale factor
acts as a divisor. All GPS coordinates will also be divided by the scale
factor. In this way, the same "ground to grid" number can be used to
convert total station shots to the grid, or alternately to convert GPS shots
to the ground.

Sea Level Correction: This is either Off or On. It applies only to total
station work. If turned On, the distances that are measured will be reduced
the higher the elevation of the survey. This is, in effect, a ground to
grid conversion. When using a total station and surveying between state
plane coordinates (coordinates based on a sea level grid), distances at
elevation must be reduced. This will occur automatically when sea level
correction is turned on. Distance effects are negligible under 1000 feet
(300 meters) but do become geometrically larger over greater distances.

Sincerely,
Jason Hallett, PLS
SurvCE Technical Director
Carlson Software

"Terry Strickland" <jtstrickland@bellsouth.net> wrote in message
news:d8hv3a$koq$1@update.carlsonsw.com...
I have a question regarding the scale factor in the units tab under job
settings. Should this be a combined scale factor (grid + elevation), or
just a grid scale factor, with the sea level correction turned on?
thanks,
terry strickland
Jason Hallett, PLS
 


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