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 <la...@starlightsolar.com>
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
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 11114
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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