Re: [RE-wrenches] GPS units

[roger dixon]

I use Google Earth all the time and although it will give you a rough/close
elevation, I don't think it is close enough for William's needs.

Roger Dixon
Certified Wind Site Assessor
Skylands Renewable Energy, LLC
908.337.2057 cell
908.730.6474 fax
roger.di...@att.net

-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Dave Click
Sent: Thursday, January 29, 2009 7:31 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] GPS units

William,

Though I wouldn't call it foolproof, and I'm not sure how accurate it 
would be for your application, Google Earth has topographic data in it-- 
just hover your mouse over a point to get its elevation. Not exactly a 
substitute for a laser level, but it may be helpful.

Dave

 Original Message --------
Subject: Re: [RE-wrenches] GPS units
From: Starlight Solar, Yuma, AZ 
To: RE-wrenches 
Date: 2009/01/28 18:13

> Hi William,
> 
> In past life as an advanced flight instructor in powered parachutes and 
> I used to carry the Garmin GPS-90. It has an analog altimeter and 
> electronic compass. It also keeps a graphical log of elevations. You can 
> turn off the GPS input for these functions and just use the analog. 
> Great if the GPS satellite system goes down and you don't want to land 
> in a plowed field because you are lost!
> 
> I doubt the resolution is good enough for what you need but it may be 
> worth a look.
> 
> Kindest Regards,
> 
> Larry Crutcher
> Starlight Solar
> (928) 941-1660
> Renewable Energy Products, Service and Installation
> 
> Mailing Address (NO SHIPPING):
> Box 4
> 11279 S. Glenwood Ave
> Yuma, AZ 85367
> 
> Shipping and retail store (NO MAIL):
> 2998 Shari Ave
> Yuma, AZ 85365
> 
> On Jan 27, 2009, at 2:34 PM, William Miller wrote:
> 
>> Does anyone have a foolproof tool to measure elevation?  I have 
>> researched GPS units recently.  They are notoriously inaccurate for 
>> elevation:
>>
>> http://wiki.motionbased.com/mb/GPS_Unit_Elevation
>>
>> Here are few more links with GPS fundamentals:
>>
>> http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
>> http://www.gpsreview.net/electronic-compass/
>>
>> I have a Suunto Observer watch with an altimeter.  I think I can get 
>> relatively accurate measurements of DIFFERENCE in elevation if I 
>> measure the two elevations in quick succession.  I will be trying it.
>>
>>
>>
>> William
> 
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Re: [RE-wrenches] GPS units

[Dave Click]

William,

Though I wouldn't call it foolproof, and I'm not sure how accurate it 
would be for your application, Google Earth has topographic data in it-- 
just hover your mouse over a point to get its elevation. Not exactly a 
substitute for a laser level, but it may be helpful.


Dave

 Original Message 
Subject: Re: [RE-wrenches] GPS units
From: Starlight Solar, Yuma, AZ 
To: RE-wrenches 
Date: 2009/01/28 18:13


Hi William,

In past life as an advanced flight instructor in powered parachutes and 
I used to carry the Garmin GPS-90. It has an analog altimeter and 
electronic compass. It also keeps a graphical log of elevations. You can 
turn off the GPS input for these functions and just use the analog. 
Great if the GPS satellite system goes down and you don't want to land 
in a plowed field because you are lost!


I doubt the resolution is good enough for what you need but it may be 
worth a look.


Kindest Regards,

Larry Crutcher
Starlight Solar
(928) 941-1660
Renewable Energy Products, Service and Installation

Mailing Address (NO SHIPPING):
Box 4
11279 S. Glenwood Ave
Yuma, AZ 85367

Shipping and retail store (NO MAIL):
2998 Shari Ave
Yuma, AZ 85365

On Jan 27, 2009, at 2:34 PM, William Miller wrote:

Does anyone have a foolproof tool to measure elevation?  I have 
researched GPS units recently.  They are notoriously inaccurate for 
elevation:


http://wiki.motionbased.com/mb/GPS_Unit_Elevation

Here are few more links with GPS fundamentals:

http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
http://www.gpsreview.net/electronic-compass/

I have a Suunto Observer watch with an altimeter.  I think I can get 
relatively accurate measurements of DIFFERENCE in elevation if I 
measure the two elevations in quick succession.  I will be trying it.




William


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Re: [RE-wrenches] GPS units

[Starlight Solar, Yuma, AZ]

Hi William,

In past life as an advanced flight instructor in powered parachutes  
and I used to carry the Garmin GPS-90. It has an analog altimeter and  
electronic compass. It also keeps a graphical log of elevations. You  
can turn off the GPS input for these functions and just use the  
analog. Great if the GPS satellite system goes down and you don't want  
to land in a plowed field because you are lost!


I doubt the resolution is good enough for what you need but it may be  
worth a look.


Kindest Regards,

Larry Crutcher
Starlight Solar
(928) 941-1660
Renewable Energy Products, Service and Installation

Mailing Address (NO SHIPPING):
Box 4
11279 S. Glenwood Ave
Yuma, AZ 85367

Shipping and retail store (NO MAIL):
2998 Shari Ave
Yuma, AZ 85365

On Jan 27, 2009, at 2:34 PM, William Miller wrote:

Does anyone have a foolproof tool to measure elevation?  I have  
researched GPS units recently.  They are notoriously inaccurate for  
elevation:


http://wiki.motionbased.com/mb/GPS_Unit_Elevation

Here are few more links with GPS fundamentals:

http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
http://www.gpsreview.net/electronic-compass/

I have a Suunto Observer watch with an altimeter.  I think I can get  
relatively accurate measurements of DIFFERENCE in elevation if I  
measure the two elevations in quick succession.  I will be trying it.




William


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Re: [RE-wrenches] GPS units

[roger dixon]

If you want to get within a few feet of accuracy a device that measures
barometric pressure is the only current option.  A basic altimeter is
needed.  A Barometric Altimeter  measures altitude.  As noted in another
post, they work off of barometric pressure.  Aircraft grade equipment,
although expensive,  is the best option available.  A Variometer is  also
known as a rate-of-climb indicator or a vertical speed indicator (VSI).  It
measures rate of climb and/or fall.  A Variometer can also have an altimeter
function built into it.

Here is a good link for building one,
http://ludens.cl/Electron/Vario/vario.html

Roger Dixon
Certified Wind Site Assessor
Skylands Renewable Energy, LLC
908.337.2057 cell
908.730.6474 fax
roger.di...@att.net

-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of
penobscotso...@midmaine.com
Sent: Wednesday, January 28, 2009 7:26 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] GPS units

I'll reiterate what was said earlier. I paraglide and use a variometer for
measuring altitude. It uses barometric pressure and is accurate to within
a few feet (cross referencing maps of launch areas). You can find used,
very good quality variometers on paragliding and hang gliding sites for a
couple hundred dollars or buy one new for about $400.

Daryl
Penobscot Solar Design


> I used to have a WW II aircraft altimeter (out of an Aircobra) installed
> in a Diesel LandRover when I first started pump work years ago. The
> instrument took all the guesswork out of sizing pumps, and let me know
> when the naturally aspirated Diesel was going to be making more smoke
> than horsepower. An altimeter needs to be set every time you head out,
> but they are accurate to within a few feet. Over the years, I have used
> GPS, shot in elevations with transit and rod, used fine elevation topos
> and guessed. :-) I agree that the only really accurate method, if
> available, is to use a pressure gauge on existing plumbing, but an
> altimeter is a close second and a GPS third.
>
> Matt T
>
> Jason Lombard wrote:
>
>> William,
>>
>> Topographic maps are great if your familiar with them. A laser if you
>> can afford it or the best I have heard of is fill a tube or pipe with
>> water from the pump to your tank and measure the psi at the base of
>> it. The calculation is 2.31 feet of lift for every psi. Not everyone
>> has their piping rolled out or on site yet so this could be a
>> challenge and again is very accurate.
>>
>> BTW - GPS units are inaccurate to the extent that they are 40 feet off
>> horizontally and 90 feet vertically. This means you could be up to 130
>> feet off. Big difference when your sizing for particular pump out put.
>>
>> Good luck,
>>
>> On Tue, Jan 27, 2009 at 2:34 PM, William Miller > <mailto:wrmil...@charter.net>> wrote:
>>
>> Does anyone have a foolproof tool to measure elevation?  I have
>> researched GPS units recently.  They are notoriously inaccurate
>> for elevation:
>>
>> http://wiki.motionbased.com/mb/GPS_Unit_Elevation
>>
>> Here are few more links with GPS fundamentals:
>>
>> http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
>> http://www.gpsreview.net/electronic-compass/
>>
>> I have a Suunto Observer watch with an altimeter.  I think I can
>> get relatively accurate measurements of DIFFERENCE in elevation if
>> I measure the two elevations in quick succession.  I will be
>> trying it.
>>
>>
>>
>> William
>>
>> ___
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>>
>>
>>
>> --
>> Jason Lombard
>> Open Hand Solar LLC.
>> Certified Sustainable Building Adviser
>> openhandso...@gmail.com <mailto:openhandso...@gmail.com>
>> 505 795 8646
>>
>> "I'd put my money on solar energy... I hope we don't have to wait 'til
>> oil and coal run o

Re: [RE-wrenches] GPS units

[penobscotsolar]

I'll reiterate what was said earlier. I paraglide and use a variometer for
measuring altitude. It uses barometric pressure and is accurate to within
a few feet (cross referencing maps of launch areas). You can find used,
very good quality variometers on paragliding and hang gliding sites for a
couple hundred dollars or buy one new for about $400.

Daryl
Penobscot Solar Design


> I used to have a WW II aircraft altimeter (out of an Aircobra) installed
> in a Diesel LandRover when I first started pump work years ago. The
> instrument took all the guesswork out of sizing pumps, and let me know
> when the naturally aspirated Diesel was going to be making more smoke
> than horsepower. An altimeter needs to be set every time you head out,
> but they are accurate to within a few feet. Over the years, I have used
> GPS, shot in elevations with transit and rod, used fine elevation topos
> and guessed. :-) I agree that the only really accurate method, if
> available, is to use a pressure gauge on existing plumbing, but an
> altimeter is a close second and a GPS third.
>
> Matt T
>
> Jason Lombard wrote:
>
>> William,
>>
>> Topographic maps are great if your familiar with them. A laser if you
>> can afford it or the best I have heard of is fill a tube or pipe with
>> water from the pump to your tank and measure the psi at the base of
>> it. The calculation is 2.31 feet of lift for every psi. Not everyone
>> has their piping rolled out or on site yet so this could be a
>> challenge and again is very accurate.
>>
>> BTW - GPS units are inaccurate to the extent that they are 40 feet off
>> horizontally and 90 feet vertically. This means you could be up to 130
>> feet off. Big difference when your sizing for particular pump out put.
>>
>> Good luck,
>>
>> On Tue, Jan 27, 2009 at 2:34 PM, William Miller > > wrote:
>>
>> Does anyone have a foolproof tool to measure elevation?  I have
>> researched GPS units recently.  They are notoriously inaccurate
>> for elevation:
>>
>> http://wiki.motionbased.com/mb/GPS_Unit_Elevation
>>
>> Here are few more links with GPS fundamentals:
>>
>> http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
>> http://www.gpsreview.net/electronic-compass/
>>
>> I have a Suunto Observer watch with an altimeter.  I think I can
>> get relatively accurate measurements of DIFFERENCE in elevation if
>> I measure the two elevations in quick succession.  I will be
>> trying it.
>>
>>
>>
>> William
>>
>> ___
>> List sponsored by Home Power magazine
>>
>> List Address: RE-wrenches@lists.re-wrenches.org
>> 
>>
>> Options & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
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>> www.re-wrenches.org/etiquette.htm
>> 
>>
>> Check out participant bios:
>> www.members.re-wrenches.org 
>>
>>
>>
>>
>> --
>> Jason Lombard
>> Open Hand Solar LLC.
>> Certified Sustainable Building Adviser
>> openhandso...@gmail.com 
>> 505 795 8646
>>
>> "I'd put my money on solar energy... I hope we don't have to wait 'til
>> oil and coal run out before we tackle that."
>>
>> --Thomas Edison
>>
>>
>>
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>>
>>No virus found in this incoming message.
>>Checked by AVG - http://www.avg.com
>>Version: 8.0.176 / Virus Database: 270.10.14/1918 - Release Date:
>> 1/27/2009 7:26 AM
>>
>>
>>
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Li

Re: [RE-wrenches] GPS units

[Matt Tritt]

I used to have a WW II aircraft altimeter (out of an Aircobra) installed 
in a Diesel LandRover when I first started pump work years ago. The 
instrument took all the guesswork out of sizing pumps, and let me know 
when the naturally aspirated Diesel was going to be making more smoke 
than horsepower. An altimeter needs to be set every time you head out, 
but they are accurate to within a few feet. Over the years, I have used 
GPS, shot in elevations with transit and rod, used fine elevation topos 
and guessed. :-) I agree that the only really accurate method, if 
available, is to use a pressure gauge on existing plumbing, but an 
altimeter is a close second and a GPS third.


Matt T

Jason Lombard wrote:


William,

Topographic maps are great if your familiar with them. A laser if you 
can afford it or the best I have heard of is fill a tube or pipe with 
water from the pump to your tank and measure the psi at the base of 
it. The calculation is 2.31 feet of lift for every psi. Not everyone 
has their piping rolled out or on site yet so this could be a 
challenge and again is very accurate.


BTW - GPS units are inaccurate to the extent that they are 40 feet off 
horizontally and 90 feet vertically. This means you could be up to 130 
feet off. Big difference when your sizing for particular pump out put.


Good luck,

On Tue, Jan 27, 2009 at 2:34 PM, William Miller > wrote:


Does anyone have a foolproof tool to measure elevation?  I have
researched GPS units recently.  They are notoriously inaccurate
for elevation:

http://wiki.motionbased.com/mb/GPS_Unit_Elevation

Here are few more links with GPS fundamentals:

http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
http://www.gpsreview.net/electronic-compass/

I have a Suunto Observer watch with an altimeter.  I think I can
get relatively accurate measurements of DIFFERENCE in elevation if
I measure the two elevations in quick succession.  I will be
trying it.



William

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--
Jason Lombard
Open Hand Solar LLC.
Certified Sustainable Building Adviser
openhandso...@gmail.com 
505 795 8646

"I'd put my money on solar energy... I hope we don't have to wait 'til 
oil and coal run out before we tackle that."


--Thomas Edison



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No virus found in this incoming message.
Checked by AVG - http://www.avg.com 
Version: 8.0.176 / Virus Database: 270.10.14/1918 - Release Date: 1/27/2009 7:26 AM


 

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Re: [RE-wrenches] GPS units

[Bruce Geddes]

Hi WIlliam,  I have a small hand held device called an Alba Windwatch made by 
Silva for this job and calculating hydro heads.  The specs claim an accuracy to 
+- 1.0m.  It uses barometric pressure and so far I have found it pretty good.  
Only downside is it is not waterproof so falling in streams can be a problem!

I always check it out before using it by putting it on the ground, letting it 
stabilise and then making sure it registers a change as I raise it above waist 
height.  One thing to be careful of is the pressure sensor is mounted behind 
the battery and the compartment is vented to allow exposure to the atmosphere 
so heat from the hand can upset the pressure reading.  It needs to be held by 
the edges with the fingertips to be accurate.

Bruce Geddes
PowerOn
A small place called New Zealand

  Accurate enough to size water pumping systems.  I imagine 3 meters total, or 
+/- 1.5 meters.  I don't need absolute measurements, just relative between two 
points.

  William
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Re: [RE-wrenches] GPS units

[Tom Elliot]

The elevation accuracy of commercial GPS units is horrible, I've seen them 
off by more than 100 feet and they are not reliable at all for the requested 
usage in this instance.  Surveyors use GPS units that are accurate in both 
horizontal and vertical axis measurements but they use radio frequency units 
to get down to accuracy levels within inches on either.

My suggestion is to contact a manufacturer of surveying equipment and asking 
them for technical information on how their units achieve high degrees of 
accuracy.  But be advised, they are very expensive.

Tom


  - Original Message - 
  From: Peter Parrish
  To: 'RE-wrenches'
  Sent: Tuesday, January 27, 2009 12:32 PM
  Subject: Re: [RE-wrenches] GPS units


  A caution to all. There are various types of GPS units, with varying 
accuracies. The most accurate are spec'd at around +/- 6 feet. I have a 
Garmin Etrex and under normal circumstances it delivers at that spec or 
better (+/- 3 feet). Near tall buildings or in a steep canyon, the accuracy 
goes to pot but for known reasons (multiple reflections of the radio 
signals). I have no manufacturer's info on elevation, but knowing how GPS 
units work, the resolution/accuracy in elevation should be roughly the same.



  - Peter

  Peter T. Parrish, President
  California Solar Engineering, Inc.
  820 Cynthia Ave., Los Angeles, CA 90065
  Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
  CA Lic. 854779, NABCEP Cert. 031806-26
  peter.parr...@calsolareng.com


--

  From: re-wrenches-boun...@lists.re-wrenches.org 
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Jason 
Lombard
  Sent: Tuesday, January 27, 2009 2:02 PM
  To: RE-wrenches
  Subject: Re: [RE-wrenches] GPS units



  William,

  Topographic maps are great if your familiar with them. A laser if you can 
afford it or the best I have heard of is fill a tube or pipe with water from 
the pump to your tank and measure the psi at the base of it. The calculation 
is 2.31 feet of lift for every psi. Not everyone has their piping rolled out 
or on site yet so this could be a challenge and again is very accurate.

  BTW - GPS units are inaccurate to the extent that they are 40 feet off 
horizontally and 90 feet vertically. This means you could be up to 130 feet 
off. Big difference when your sizing for particular pump out put.

  Good luck,

  On Tue, Jan 27, 2009 at 2:34 PM, William Miller  
wrote:

  Does anyone have a foolproof tool to measure elevation?  I have researched 
GPS units recently.  They are notoriously inaccurate for elevation:

  http://wiki.motionbased.com/mb/GPS_Unit_Elevation

  Here are few more links with GPS fundamentals:

  http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
  http://www.gpsreview.net/electronic-compass/

  I have a Suunto Observer watch with an altimeter.  I think I can get 
relatively accurate measurements of DIFFERENCE in elevation if I measure the 
two elevations in quick succession.  I will be trying it.



  William

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Re: [RE-wrenches] GPS units

[jay peltz]

Hi William,

My GPS unit is accurate to about 10' on the barometric side.

Mine is Garmin Etrex summit

I use it all the time for hydro and water pumping.

jay

peltz power


On Jan 27, 2009, at 1:46 PM, William Miller wrote:


Jay:

Accurate enough to size water pumping systems.  I imagine 3 meters  
total, or +/- 1.5 meters.  I don't need absolute measurements, just  
relative between two points.


William




At 01:42 PM 1/27/2009, you wrote:

Hi William,

What sort of accuracy are you needing?

jay

peltz power





On Jan 27, 2009, at 1:34 PM, William Miller wrote:


Does anyone have a foolproof tool to measure elevation?  I have
researched GPS units recently.  They are notoriously inaccurate for
elevation:

http://wiki.motionbased.com/mb/GPS_Unit_Elevation

Here are few more links with GPS fundamentals:

http://www.adventurenetwork.com/cgi-bin/adventurenetwork/ 
GPS_101.html

http://www.gpsreview.net/electronic-compass/

I have a Suunto Observer watch with an altimeter.  I think I can get
relatively accurate measurements of DIFFERENCE in elevation if I
measure the two elevations in quick succession.  I will be trying  
it.




William

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Re: [RE-wrenches] GPS units

[Peter Parrish]

A caution to all. There are various types of GPS units, with varying
accuracies. The most accurate are spec'd at around +/- 6 feet. I have a
Garmin Etrex and under normal circumstances it delivers at that spec or
better (+/- 3 feet). Near tall buildings or in a steep canyon, the accuracy
goes to pot but for known reasons (multiple reflections of the radio
signals). I have no manufacturer's info on elevation, but knowing how GPS
units work, the resolution/accuracy in elevation should be roughly the same.


 

- Peter

Peter T. Parrish, President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
CA Lic. 854779, NABCEP Cert. 031806-26
peter.parr...@calsolareng.com 

  _  

From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Jason
Lombard
Sent: Tuesday, January 27, 2009 2:02 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] GPS units

 

William,

Topographic maps are great if your familiar with them. A laser if you can
afford it or the best I have heard of is fill a tube or pipe with water from
the pump to your tank and measure the psi at the base of it. The calculation
is 2.31 feet of lift for every psi. Not everyone has their piping rolled out
or on site yet so this could be a challenge and again is very accurate.

BTW - GPS units are inaccurate to the extent that they are 40 feet off
horizontally and 90 feet vertically. This means you could be up to 130 feet
off. Big difference when your sizing for particular pump out put.

Good luck,

On Tue, Jan 27, 2009 at 2:34 PM, William Miller 
wrote:

Does anyone have a foolproof tool to measure elevation?  I have researched
GPS units recently.  They are notoriously inaccurate for elevation:

http://wiki.motionbased.com/mb/GPS_Unit_Elevation

Here are few more links with GPS fundamentals:

http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
http://www.gpsreview.net/electronic-compass/

I have a Suunto Observer watch with an altimeter.  I think I can get
relatively accurate measurements of DIFFERENCE in elevation if I measure the
two elevations in quick succession.  I will be trying it.



William

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Open Hand Solar LLC.
Certified Sustainable Building Adviser
openhandso...@gmail.com
505 795 8646

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coal run out before we tackle that."

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Re: [RE-wrenches] GPS units

[Jason Lombard]

William,

Topographic maps are great if your familiar with them. A laser if you can
afford it or the best I have heard of is fill a tube or pipe with water from
the pump to your tank and measure the psi at the base of it. The calculation
is 2.31 feet of lift for every psi. Not everyone has their piping rolled out
or on site yet so this could be a challenge and again is very accurate.

BTW - GPS units are inaccurate to the extent that they are 40 feet off
horizontally and 90 feet vertically. This means you could be up to 130 feet
off. Big difference when your sizing for particular pump out put.

Good luck,

On Tue, Jan 27, 2009 at 2:34 PM, William Miller wrote:

> Does anyone have a foolproof tool to measure elevation?  I have researched
> GPS units recently.  They are notoriously inaccurate for elevation:
>
> http://wiki.motionbased.com/mb/GPS_Unit_Elevation
>
> Here are few more links with GPS fundamentals:
>
> http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
> http://www.gpsreview.net/electronic-compass/
>
> I have a Suunto Observer watch with an altimeter.  I think I can get
> relatively accurate measurements of DIFFERENCE in elevation if I measure the
> two elevations in quick succession.  I will be trying it.
>
>
>
> William
>
> ___
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>
> List Address: RE-wrenches@lists.re-wrenches.org
>
> Options & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
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>
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> www.members.re-wrenches.org
>
>


-- 
Jason Lombard
Open Hand Solar LLC.
Certified Sustainable Building Adviser
openhandso...@gmail.com
505 795 8646

"I'd put my money on solar energy… I hope we don't have to wait 'til oil and
coal run out before we tackle that."

—Thomas Edison
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Re: [RE-wrenches] GPS units

[William Miller]

Jay:

Accurate enough to size water pumping systems.  I imagine 3 meters total, 
or +/- 1.5 meters.  I don't need absolute measurements, just relative 
between two points.


William




At 01:42 PM 1/27/2009, you wrote:

Hi William,

What sort of accuracy are you needing?

jay

peltz power





On Jan 27, 2009, at 1:34 PM, William Miller wrote:


Does anyone have a foolproof tool to measure elevation?  I have
researched GPS units recently.  They are notoriously inaccurate for
elevation:

http://wiki.motionbased.com/mb/GPS_Unit_Elevation

Here are few more links with GPS fundamentals:

http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
http://www.gpsreview.net/electronic-compass/

I have a Suunto Observer watch with an altimeter.  I think I can get
relatively accurate measurements of DIFFERENCE in elevation if I
measure the two elevations in quick succession.  I will be trying it.



William

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Re: [RE-wrenches] GPS units

[jay peltz]

Hi William,

What sort of accuracy are you needing?

jay

peltz power





On Jan 27, 2009, at 1:34 PM, William Miller wrote:

Does anyone have a foolproof tool to measure elevation?  I have  
researched GPS units recently.  They are notoriously inaccurate for  
elevation:


http://wiki.motionbased.com/mb/GPS_Unit_Elevation

Here are few more links with GPS fundamentals:

http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
http://www.gpsreview.net/electronic-compass/

I have a Suunto Observer watch with an altimeter.  I think I can get  
relatively accurate measurements of DIFFERENCE in elevation if I  
measure the two elevations in quick succession.  I will be trying it.




William

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[RE-wrenches] GPS units

[William Miller]

Does anyone have a foolproof tool to measure elevation?  I have researched 
GPS units recently.  They are notoriously inaccurate for elevation:


http://wiki.motionbased.com/mb/GPS_Unit_Elevation

Here are few more links with GPS fundamentals:

http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
http://www.gpsreview.net/electronic-compass/

I have a Suunto Observer watch with an altimeter.  I think I can get 
relatively accurate measurements of DIFFERENCE in elevation if I measure 
the two elevations in quick succession.  I will be trying it.




William

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