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Tool Talk Discussion Forum

GPS for basic surveying?

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The Original Sc

12-16-2004 22:19:19




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Howdy all,

Is it possible to do "guesstimate" surveying with a GPS receiver (Garmin) and a TOPO program on my computer?

My Delorme' TOPO program has Lat-Long coordinates on it which match up to the same #'s on my Garmin, but I'd like to find out how to get the Lat-long #'s from a program which will match up with the SE1/4 NE1/4 (etc) descriptions from my legals.

If I could just find my corners, that would be great!


Scott in Sandpoint

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Dusty

12-18-2004 06:02:26




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 Re: GPS for basic surveying? in reply to The Original Scott, 12-16-2004 22:19:19  
Once you have your corner posts put a used blade from a field disk over it. It will make a much larger mass of metal to find next time.



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T_Bone

12-18-2004 04:05:04




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 Re: GPS for basic surveying? in reply to The Original Scott, 12-16-2004 22:19:19  
Hi Scott,

If you had a GPS measure to with in 3 meters on a triangle then you could keep trianglating with in that triangle to increase accuracy. It would just be a extremely slow method.

Plot it out on paper and see how many triangles would have to be layed out in order to achive the wanted accuracy.

T_Bone



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greenbeanman in Kansas

12-17-2004 06:13:40




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 Re: GPS for basic surveying? in reply to The Original Scott, 12-16-2004 22:19:19  
About a month ago this topic was discussed on another forum I visit. The general concensus was that the results are not accurate enough to really be of value. Having said that, some units are more accurate than others, and some areas have more satellite availability for greater positioning accuracy.

If your property has ever been surveyed you may be able to locate metal pins marking the corners. A metal detector is used to locate them.

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500sks

12-17-2004 06:48:38




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 Re: GPS for basic surveying? in reply to greenbeanman in Kansas, 12-17-2004 06:13:40  
I work for an engineering firm and I use Terrain Navigator Pro to put GPS point into our handheld GPS for the guys in the field. They use the handheld GPS to get them near the corner and then they start looking for evidence of the corner. Many times it is with in 10 to 20 feet of the pipe or what ever is there for a marker. If you are looking for section corners and they are in the ground the GPS will most likely get you near the point and you should be able to find the pin. But our guys still have to traverse to the points and locate them with total stations for accurrate surveys. Here in the northwoods many time you have to go around swamps and thru brush to get to coners and the gps allow you to go in any direction and get back to the line you are looking for after going around an obsticle.

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Dave (IL)

12-17-2004 11:14:42




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 Re: GPS for basic surveying? in reply to 500sks, 12-17-2004 06:48:38  
Where do you get the lat longs for the section corners?
IL has the original plats on line and it's fascinating. I can't get them to run under Win 2000. I think they had lat longs on them, but I can't remember for sure. How accurate would they be from those original survey maps?
Thanks



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500sks

12-20-2004 04:54:38




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 Re: GPS for basic surveying? in reply to Dave (IL), 12-17-2004 11:14:42  
I pick them from the USGS quad maps, it doesn't sound very accurate but it works most of the time. This is just to get the guys close so they can find the corner. It is accurate about 80%-90% of the time, big time saver.



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