On 5/11/2012 6:57 AM, Jim Lux wrote:
On 5/11/12 5:54 AM, Chuck Harris wrote:
Go to your local building and planning commission, and get yourself
a copy of the topographical map for your address. They are cheap, and
are the standard by which everyone (insurance, zoning, ...) determines
your flood
On 5/11/2012 6:46 AM, Jim Lux wrote:
On 5/11/12 5:23 AM, swingbyte wrote:
s disappointing!
I need to measure the height of my house floor to be above the flood
plane contour. I might have a look at some dted from work. Might have to
pay a real surveyor to measure the height datum.
Thanks for al
The FEMA maps didn't exist the last time I did this. I would think
it likely that the building and planning commission office for his
area would have the appropriate maps, as establishing that the proposed
house's location is outside of the the 100 year flood plane, is a
necessary check mark in g
On 5/11/12 5:54 AM, Chuck Harris wrote:
Go to your local building and planning commission, and get yourself
a copy of the topographical map for your address. They are cheap, and
are the standard by which everyone (insurance, zoning, ...) determines
your flood plane exposure.
I have been infor
On 5/11/12 5:23 AM, swingbyte wrote:
s disappointing!
I need to measure the height of my house floor to be above the flood
plane contour. I might have a look at some dted from work. Might have to
pay a real surveyor to measure the height datum.
Thanks for all the info though guys
for that, yo
Go to your local building and planning commission, and get yourself
a copy of the topographical map for your address. They are cheap, and
are the standard by which everyone (insurance, zoning, ...) determines
your flood plane exposure.
-Chuck Harris
...
Well that's disappointing!
I need to me
On 11/05/2012 00:44, b...@lysator.liu.se wrote:
Hi Tim,
The answer is NO. Even though decent accuracy can be had with long
averaging. It was discussed a few years ago on this list.
--
Björn
Hi all,
Hope this isn't too chat roomy, however, I have need of a survey precise
geolocation type
On 5/10/12 10:46 AM, Chris Albertson wrote:
"mean sea level" is not meaningful any more. What shape is the ocean
and what if you live in Kanas? How to extrapolate the ocean level to
Kanas? The answer is to use a model of some kind
mean sea level, these days, is a name for a particular hei
On 5/10/12 9:33 AM, Attila Kinali wrote:
On Thu, 10 May 2012 17:01:48 +0200
b...@lysator.liu.se wrote:
On Thu, 10 May 2012 22:50:15 +1000
swingbyte wrote:
Hope this isn't too chat roomy, however, I have need of a survey precise
geolocation type gps. I was wondering if the precise timing abi
On 5/10/12 9:09 AM, Chris Albertson wrote:
There is an error in your quoted text. The author must have though
there was a difference between WGS84 and "true sea level". No that
is not true. If you paper map that you bought from US Gological
Survey says "WGS84" on it then THAT is the definit
On 5/10/12 7:40 AM, Arthur Dent wrote:
I've found significant altitude errors using a GPS and the following quotes
found on the internet will explain why. From my experience of hiking
in the mountains of New Hampshire an aneroid altimeter will vary with
atmospheric pressure about 200 feet for a c
On Thu, May 10, 2012 at 10:23 AM, Arthur Dent wrote:
>>Chris Albertson albertson.chris at gmail.com
>
> I'm not sure what point you're trying to make but it is a fact, as the OP
> pointed
> out, that there are differences between the empirical data of 'true
> elevation' and
> what various GPS
>Chris Albertson albertson.chris at gmail.com
>There is an error in your quoted text. The author must have though
>there was a difference between WGS84 and "true sea level". No that
>is not true. If you paper map that you bought from US Gological
>Survey says "WGS84" on it then THAT is the d
On Thu, 10 May 2012 17:01:48 +0200
b...@lysator.liu.se wrote:
> > On Thu, 10 May 2012 22:50:15 +1000
> > swingbyte wrote:
> >
> >> Hope this isn't too chat roomy, however, I have need of a survey precise
> >> geolocation type gps. I was wondering if the precise timing abilities
> >> extend to it
There is an error in your quoted text. The author must have though
there was a difference between WGS84 and "true sea level". No that
is not true. If you paper map that you bought from US Gological
Survey says "WGS84" on it then THAT is the definition of sea level on
that map. The altitudes
Attilla,
> On Thu, 10 May 2012 22:50:15 +1000
> swingbyte wrote:
>
>> Hope this isn't too chat roomy, however, I have need of a survey precise
>> geolocation type gps. I was wondering if the precise timing abilities
>> extend to its precision in position output? I have a thunderbolt and
>> one
Not for survey type accuracy (sub-meter, short measurement time).
The average (over a 48 hour period) was pretty good (about 1.5 meters,
RMS), but the reading over any 1 minute period can be off as much as 3-5
meters, satellite geometry dependent.
I Have two units with good antennas, mounted roug
Hi Tim,
The answer is NO. Even though decent accuracy can be had with long
averaging. It was discussed a few years ago on this list.
--
Björn
> Hi all,
> Hope this isn't too chat roomy, however, I have need of a survey precise
> geolocation type gps. I was wondering if the precise timing ab
I've found significant altitude errors using a GPS and the following quotes
found on the internet will explain why. From my experience of hiking
in the mountains of New Hampshire an aneroid altimeter will vary with
atmospheric pressure about 200 feet for a change of 0.2" of mercury
so you have
Le 10/05/2012 15:51, Jim Lux a écrit :
On 5/10/12 6:42 AM, mike cook wrote:
A man with only one GPS
Surveys from different receivers I have. All taken at the same height
from prolonged surveys. WGS84 datum.
Oncore UT+ A 207,62m
Oncore UT+ B 209,24m
Z3801A 180,72m
Oncore VP A 229,95m
T
On 5/10/12 6:42 AM, mike cook wrote:
A man with only one GPS
Surveys from different receivers I have. All taken at the same height
from prolonged surveys. WGS84 datum.
Oncore UT+ A 207,62m
Oncore UT+ B 209,24m
Z3801A 180,72m
Oncore VP A 229,95m
TBolt 207.00m
That's a pretty big vari
A man with only one GPS
Surveys from different receivers I have. All taken at the same
height from prolonged surveys. WGS84 datum.
Oncore UT+ A 207,62m
Oncore UT+ B 209,24m
Z3801A 180,72m
Oncore VP A 229,95m
TBolt 207.00m
Le 10/05/2012 14:5
On 5/10/12 6:08 AM, Magnus Danielson wrote:
On 05/10/2012 02:50 PM, swingbyte wrote:
Hi all,
Hope this isn't too chat roomy, however, I have need of a survey precise
geolocation type gps. I was wondering if the precise timing abilities
extend to its precision in position output? I have a thunder
On Thu, 10 May 2012 22:50:15 +1000
swingbyte wrote:
> Hope this isn't too chat roomy, however, I have need of a survey precise
> geolocation type gps. I was wondering if the precise timing abilities
> extend to its precision in position output? I have a thunderbolt and
> one of those conical
sion of precise time and frequency measurement
>Subject: [time-nuts] question about Thunderbolt geo acuracy
>
>Hi all,
>Hope this isn't too chat roomy, however, I have need of a survey precise
>geolocation type gps. I was wondering if the precise timing abilities
>extend to its
On 05/10/2012 02:50 PM, swingbyte wrote:
Hi all,
Hope this isn't too chat roomy, however, I have need of a survey precise
geolocation type gps. I was wondering if the precise timing abilities
extend to its precision in position output? I have a thunderbolt and one
of those conical white aerials f
swingbyte
Sent: 10 May 2012 13:50
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] question about Thunderbolt geo acuracy
Hi all,
Hope this isn't too chat roomy, however, I have need of a survey precise
geolocation type gps. I was wondering if the precise t
Hi all,
Hope this isn't too chat roomy, however, I have need of a survey precise
geolocation type gps. I was wondering if the precise timing abilities
extend to its precision in position output? I have a thunderbolt and
one of those conical white aerials from china and would like to know if
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