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### scale factor calculation

how can i calculate scale factor in this following case

gps length is 103.453m(wgs84)

but true length is 103.395(by total station)

pls help me

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#### Replies

Jim's looks good!  here is a scale factor calculation tool I found as well that may help in the future  http://webpages.charter.net/sinkwich/sdventure/html/sd_scalecalc2.htm

• GPS to True = 103.395 / 103.453 = 0.99943936
GPS distance x 0.99943936 = True distance

Is this what you needed?
• Land Surveyor

Dear Jim,

I have a relevant question.

I have a list of GPS control points. and I am trying to make a traverse using Toral station.

but each one of the points has a different scale factor.

isn't the scale factor suppose to be calculated from the distance between two points as in the question above?

in this case, should I measure the distance from the site and calculate a new scale factor or use one of the scale factors which is on the list or calculate an average of them?

• thank you Jim

this used a temporary benchmark

Land Surveyor

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