Surveying: Distance meters? Gps? Other?

M

MisterE

Guest
I want to record the relative position of several thousand points on a block
of land down to about 5cm or 10cm accuracy. What would be the easiest device
to do this? Can GPS recievers get this accurate? Are there cheap laser
distance meters or something? The max distance between point is about 25m.
Any ideas?
 
MisterE wrote:
I want to record the relative position of several thousand points on a block
of land down to about 5cm or 10cm accuracy. What would be the easiest device
to do this? Can GPS recievers get this accurate? Are there cheap laser
distance meters or something? The max distance between point is about 25m.
Any ideas?


Laser unit , several hundred $ but will do it out to 50 M or more in
Click to expand...
moderate light and further at duck
 
atec 77 wrote:
MisterE wrote:
I want to record the relative position of several thousand points on a
block of land down to about 5cm or 10cm accuracy. What would be the
easiest device to do this? Can GPS recievers get this accurate? Are
there cheap laser distance meters or something? The max distance
between point is about 25m. Any ideas?

Laser unit , several hundred $ but will do it out to 50 M or more in
moderate light and further at duck
oops.. dark :)
Click to expand...
 
MisterE wrote:
I want to record the relative position of several thousand points on a block
of land down to about 5cm or 10cm accuracy. What would be the easiest device
to do this? Can GPS recievers get this accurate? Are there cheap laser
distance meters or something? The max distance between point is about 25m.
Any ideas?


A 30m steel surveying tape would be a good start. Cheap too.
Click to expand...

--
Regards,

Adrian Jansen adrianjansen at internode dot on dot net
Design Engineer J & K Micro Systems
Microcomputer solutions for industrial control
Note reply address is invalid, convert address above to machine form.
 
Mark Harriss wrote:
atec 77 wrote:

will do it out to 50 M or more in moderate light and further at duck
oops.. dark :)

Darkwing Duck???
no idea what that is
Click to expand...
 
"atec 77" <"atec 7 7 "@hotmail.com> wrote in message
news:gmm5hi$tir$3@news.motzarella.org...
Mark Harriss wrote:
atec 77 wrote:

will do it out to 50 M or more in moderate light and further at duck
oops.. dark :)

Darkwing Duck???

no idea what that is
Click to expand...
You can't see it unless you are Peking.
 
On 8/02/2009 20:29 K Ludger wrote:
"atec 77" <"atec 7 7 "@hotmail.com> wrote in message
news:gmm5hi$tir$3@news.motzarella.org...
Mark Harriss wrote:
atec 77 wrote:

will do it out to 50 M or more in moderate light and further at duck
oops.. dark :)
Darkwing Duck???

no idea what that is

You can't see it unless you are Peking.
Click to expand...
Those kinda jokes quack me up.
 
K Ludger wrote:
"atec 77" <"atec 7 7 "@hotmail.com> wrote in message
news:gmm5hi$tir$3@news.motzarella.org...
Mark Harriss wrote:
atec 77 wrote:

will do it out to 50 M or more in moderate light and further at duck
oops.. dark :)
Darkwing Duck???

no idea what that is

You can't see it unless you are Peking.


sounds like a bit of a quakup to me
Click to expand...
 
"MisterE" <mistere@nigma.net> writes:

I want to record the relative position of several thousand points on a block
of land down to about 5cm or 10cm accuracy. What would be the easiest device
to do this? Can GPS recievers get this accurate? Are there cheap laser
distance meters or something? The max distance between point is about 25m.
Any ideas?
Click to expand...
First, GPS can achieve accuracies down to about 2 mm, if you really need it.
You'd need a geodetic-grade receiver and post-processing using carrier-wave
data logged over a period of time.

But the first question HAS to be: what are you trying to do? How accurate
do you need your final results to be? You can easily make your individual
measurements accurate to 1, 5 or 10 cm, but if you then triangulate your
several thousand points, the final accuracy is a function of the cumulative
errors [usually using least-squares methods]. Do you need 3D points, or
just 2D? An ordinary measuring 30-m tape will usually do for 5 cm accuracy,
but several thousand points sounds more like a job for a theodolite, where
you can get instantaneous readings one after the other, without the hassles
of a tape. There are domestic laser- and sound-based hand-held distos, but I
doubt they'd go as far as 25 metres. 10 metres, maybe, but not 25. Stanley
make one called an Intellimeasure.

Atom
You should explain a bit more about the project.
 
MisterE wrote:
I want to record the relative position of several thousand points on a block
of land down to about 5cm or 10cm accuracy. What would be the easiest device
to do this? Can GPS recievers get this accurate? Are there cheap laser
distance meters or something? The max distance between point is about 25m.
Any ideas?
Click to expand...
Post this question on the GPS Australia website.
 
On Sun, 08 Feb 2009 14:18:28 +1000, MisterE wrote:

I want to record the relative position of several thousand points on a block
of land down to about 5cm or 10cm accuracy.
Click to expand...
How big is the block?
Why do you need that accurracy?
relative to what?

What would be the easiest device to do this?
Can GPS recievers get this accurate?
Are there cheap laser distance meters or something?
The max distance between point is about 25m.
Any ideas?
Click to expand...
If you are laying out a building, the fibreglass 30m tape will probably
suffice, provided the block is flat.
If this is your farm, then a basic GPS will suffice.
 
On 2009-02-08, MisterE <mistere@nigma.net> wrote:

I want to record the relative position of several thousand points on a block
of land down to about 5cm or 10cm accuracy. What would be the easiest device
to do this?
Click to expand...
telephone. get the yellow pages, look under "surveyors".

Can GPS recievers get this accurate?
Click to expand...
yes. differential GPS can easily

Are there cheap laser distance meters or something?
Click to expand...
oh, you want cheap, set up some profiles and run a grid of string
walk round with a measuring stick.

> The max distance between point is about 25m.
 
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