Interesting duscussion...
Has anybody tried running several surveys and plotting the answers to see
what sort of spread they get?
My guess if that the surveyed location would be off in a systematic fashion
if you had something like a tree blocking a big chunk of the sky. I don't
know what th
Yes, that seems to describe the numbers on my survey. So, without knowing
the lat/long of the known markers, this isn't going to get me anywhere. Oh
well, it was a thought.
Thanks to everyone for the input.
- Original Message -
From: "Chuck Harris" <[EMAIL PROTECTED]>
To: "Discussion of
Generally, surveys are based on three things: known markers, angular
measurements,
and distances between survey points. The angular measurements are based on the
compass north, and take into account the declination error in effect for the
day the survey was made. They are listed in the format: [
My mother just became a surveyor. She loves to talk about her job.
If anyone has questions for her, I'll pass them along. Before becoming
a surveyor, she was a research chemist at Morton International.
I remember her saying something about a national monument system
(little markers in the ground,
Surveyors use different coordinates systems for different states. In
Alabama, they use State Plane Coordinates. You can use a program such
as Corpscon6 to convert these and other coordinates back to something
more useful
A lot of plat surveys are just angles in degrees minutes and seconds
> Dumb question time - have you tried asking the surveyor what the numbers
> are and how to convert?
>
> John
Not a dumb question. I thought about it, but I suspect that he/they wouldn't
want to take the time to explain this to me, not being a paying customer.
___
Joseph Gray wrote:
>> Where are you? Some countries (for example the UK) have their own grid
>> system. A survey should be accurate to around 20mm +/- 50ppm
>>
>
> I'm in NM, USA. I wanted to see if I couldn't come up with a more accurate
> lat/long than the Z3801 survey function provides.
> Where are you? Some countries (for example the UK) have their own grid
> system. A survey should be accurate to around 20mm +/- 50ppm
I'm in NM, USA. I wanted to see if I couldn't come up with a more accurate
lat/long than the Z3801 survey function provides.
___
Joseph Gray wrote:
> Let me first say that I don't know anything about surveying. I have a copy
> of the plat survey for my house. On the survey are four sets of coordinates
> that resemble lat/long numbers, but obviously aren't. What are these
> coordinates and is there any way to calculate a lat/
Let me first say that I don't know anything about surveying. I have a copy
of the plat survey for my house. On the survey are four sets of coordinates
that resemble lat/long numbers, but obviously aren't. What are these
coordinates and is there any way to calculate a lat/long of a specific point
on
On http://www.thinksrs.com/products/PRS10.htm SRS says:
"Historically, the lifetime of rubidium frequency standards has been
dominated by rubidium depletion in the discharge lamp. To avoid
excess flicker noise, manufacturers would load less than 100 µg of
rubidium into spherical discharge la
Ulrich Bangert said the following on 07/09/2006 11:19 AM:
> John,
>
> of course, because it is simple serial communication, you don't get an
> real pc interrupt on a device SRQ as would be possible with a hardware
> GPIB pc card. You have to ask the interface in a fast manner to check
> for the st
In a message dated 7/9/2006 04:56:51 Pacific Daylight Time, [EMAIL PROTECTED]
writes:
>>I found that USB-GPIB controller. Looks like BSD and Linux are supported.
>
>
>> http://www.sparkfun.com/commerce/product_info.php?products_id=549
>
>
> Hi, I bought one on Ebay, they work quite we
John,
of course, because it is simple serial communication, you don't get an
real pc interrupt on a device SRQ as would be possible with a hardware
GPIB pc card. You have to ask the interface in a fast manner to check
for the status of the SRQ line. But that is no real problem at 115200
Baud.
BT
That's good news, Ulrich. SRQ programming is really annoying, but
sometimes you need to do it...
John
Ulrich Bangert said the following on 07/09/2006 09:58 AM:
> Hi John,
>
> the SPARK FUN part can definitely detect the status of the SRQ line and
> perform a serial poll to read the status
Hi John,
the SPARK FUN part can definitely detect the status of the SRQ line and
perform a serial poll to read the status bytes of attached devices. That
were two of the major reasons why i preferred them against other cheaper
circuits.
Regards
Ulrich Bangert
> -Ursprüngliche Nachricht
Hi All,
i ordered one of the here discussed USB to GPIB converters from SPARK
FUN ELECTRONICS a few days ago. The wep page tells that they are out of
stock but I received the message very soon that mine will ship on July
the 4th, so they possibly built them 'just in time'.
>I found that USB-GPIB
[EMAIL PROTECTED] said the following on 07/08/2006 11:58 PM:
>
>
>>I found that USB-GPIB controller. Looks like BSD and Linux are supported.
>
>
>> http://www.sparkfun.com/commerce/product_info.php?products_id=549
>
>
> Hi, I bought one on Ebay, they work quite well. They used to be $99 at
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