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larry-scott
larry-scott
@larry-scott
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Joined: May 28, 2014 10:48 pm
Last seen: April 9, 2026 5:20 pm
Topics: 61 / Replies: 998
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RE: My control is WAY off of orthophotos, why?

I figured it was azimuth right off because I mostly use geodetic, and in Starnet that goes poorly right away. (Thereƒ??s a geo-grid azimuth option set...

6 years ago
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RE: My control is WAY off of orthophotos, why?

@geeoddmike Convergence angle and SF is given on the data sheet. If he has geo azimuth, I know I always have to double check if I added or subtracted ...

6 years ago
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RE: My control is WAY off of orthophotos, why?

@geeoddmike But is this a SPC job? He needs grid azimuth, which i think is problem. 

6 years ago
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RE: My control is WAY off of orthophotos, why?

@dallas-morlan He traversed 1200 feet. And 800 ft. 4 setups. Total Station. Starting SPC XY, published NGS(reset), and he must have determined an azim...

6 years ago
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RE: My control is WAY off of orthophotos, why?

Am I missing something? I havenƒ??t seen a single follow up from SapperPLS. ?ÿ ?ÿ

6 years ago
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RE: My control is WAY off of orthophotos, why?

@bstrand Yes. The pub NAD83(2011?) NGS mark and azimuth. How did he determine azimuth? 

6 years ago
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RE: My control is WAY off of orthophotos, why?

@dallas-morlan And a pair of points, not far apart, and one nad27 converted, is a very very poor source of azimuth. 

6 years ago
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RE: My control is WAY off of orthophotos, why?

What is the NGS point that you are using??ÿ

6 years ago
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RE: My control is WAY off of orthophotos, why?

Azimuth. How did you determine azimuth from the NGS point? Azimuth again: grid v geodetic. Did you use a geodetic azimuth and either forgot to apply c...

6 years ago
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RE: A 15 minute transit on ebay

@dave-karoly The description clearly has 20 second 

6 years ago
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RE: A 15 minute transit on ebay

@bill93 If that goes for 300$, I’ve got a nicer one and would take 300$. Everyone has one. On display, or in the closet. 

6 years ago
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RE: You might be an old surveyor if...

I was excited when my company bought a 3805 in 1977. I might be old, because I just got a 3805 last year. Works great. A 3805 and T2, Giant 9 glass re...

6 years ago
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RE: You might be an old surveyor if...

@bill93 Yeah, that’s a classic generational marker. So I use bearings: N315-45-30E it gets ‘em every time. 

6 years ago
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RE: integrated survey

Back in the day (1989) we used gps control with conventional surveys all the time. With todayƒ??s software trying to help you out, thereƒ??s a lot to ...

6 years ago
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RE: A 15 minute transit on ebay

@paul-in-pa I have a 1925 Royal Engineers’ textbook that describes field repair of silk crosshairs. Step #1: catch a spider. step #2: pla...

6 years ago
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RE: A 15 minute transit on ebay

Nothing special there. STD 20 sec ƒ??Bergerƒ? looking K&E. Plenty of those to go around.?ÿ

6 years ago
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RE: You might be an old surveyor if...

You might be old if you insist that you must convert azimuths to bearings first to calculate. if you remember when in the office there was only one HP...

6 years ago
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RE: Funny subdivision

The common area is HOA maintained and I assume insured. So if thereƒ??s an accident there could be a very real argument whether itƒ??s the home ownerƒ...

6 years ago
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RE: Can someone explain this to me please? UTM

@norman-oklahoma and the physical source: description of the published monuments used, or CORS, or PPP. 

6 years ago
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