Coordinate conversion

- M
- Â¡M!
  
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posted
16 years ago

Wed, Apr 26, 2006 4:15 PM

Anyone know how to convert COGO into bearings?
ex. 13803292.0810, 1979568.8290 to N 29º 36' 42", W98º 29' 33.1"

- D
- dave
  
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posted
16 years ago

Wed, Apr 26, 2006 5:13 PM

Hi M!, Some pointers: 1) All Bearings starts with N or S and ends with W or E. 2) You can not get a bearing from a single point. 3) Bearing can be computed by Tangent Bearing =3D( E1-E2)/(N1-N2)
Good Luck

- K
- keithacole
  
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posted
16 years ago

Wed, Apr 26, 2006 9:17 PM

yea.. u need 2 points.. the invers between them can give you a bearing

- M
- mebeme
  
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posted
16 years ago

Wed, Apr 26, 2006 9:48 PM

I take it you are trying to convert coordinates to latitude and longitude...? I'd check with the County Surveors office and see what they have in the way of benchmarks...
(BTW: N 29º 36' 42", W98º 29' 33.1" = NE of the intersection of Stone Oak Parkway and North Loop Texas 1604 West, San Antonio, Texas)

- R
- roy
  
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posted
16 years ago

Wed, Apr 26, 2006 10:37 PM

yes, you have only one point there. but as you get into it, here is a snippet out of the middle of some trash I wrote that would select a line and write text for a bearing.
(if a (progn (setq pt (osnap (cadr a) "nea") el (entget (car a)) pta (cdr (assoc 10 el)) ptb (cdr (assoc 11 el)) oldos (getvar "osmode") bear (angtos (angle pta ptb) 4 4) )
it took the endpoints of a line for input.
that help?

- M
- Â¡M!
  
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posted
16 years ago

Thu, Apr 27, 2006 3:32 PM

Perhaps I did not make my original post clear. I import data from GPS into AutoCAD Civil 3-D. A single point is listed as 13803292.0810, 1979568.8290. My customer wants to know the Lat & Lon of that point. Seems like there would be a button for that somewhere....
¡M! wrote:

Hi M!, Some pointers: 1) All Bearings starts with N or S and ends with W or E. 2) You can not get a bearing from a single point. 3) Bearing can be computed by Tangent Bearing =( E1-E2)/(N1-N2)
Good Luck

- M
- Â¡M!
  
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posted
16 years ago

Thu, Apr 27, 2006 3:33 PM

Where or How did you get the result (N 29º 36' 42", W98º 29' 33.1")? That's all I need to know...

- B
- Bob Morrison
  
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posted
16 years ago

Thu, Apr 27, 2006 6:15 PM

Seems to me that your GPS equipment should be able to provide the latitude & longitude of the point.
But, go can to this page for info on converting UTM to Latitude & Longitude:

formatting link

- R
- roy
  
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posted
16 years ago

Thu, Apr 27, 2006 9:18 PM

I have been a surveyor. (N 29º 36' 42", W98º 29' 33.1") is not a result. the units are mixed or something. are you parsing it correctly?
N 29º 36' 42" W could be read 29 degrees, 36 minutes 42 seconds West of North. but then the 98º 29' 33.1" has no meaning. and a bearing means nothing without a distance.
and as for 33.1" - nobody in their right mind reads anything to the tenth of a second.
you are mistaken on one point at least, you do need to know more. compliance here, just ask a better question.