Discussion:
Rich resource; Geo location UNAVCO GPS, Monumentation
(too old to reply)
Patrick Barthelow
2018-05-01 10:35:36 UTC
Permalink
Friends,
I have viewed with interest recent discussions of GPS datums, and
accuracies, and GPS precision use methods.
What I offer here, may or may not be well known amongst the group.

I am researching how to precisely locate and monitor, Astronomical
instruments that are used in VLBI studies
I have discovered a way to locate the optical (or microwave) path and
geodetic location of the prime focus of, a large parabolic dish on
the various Geodetic references, (geoid, spheroid, ellipsoid) with extreme
precision. And to do so to even accommodate where the prime focus is, as
the dish or
Telescope moves in Azimuth and elevation.
A govt agency called UNAVCO, has publicly available data networks primarily
in Western USA of PBO Plate Boundary Observatories

​


that Monitor with extreme precision, the location and time history of each
PBO site, to mm precision.
I am not an expert at VLBI, rather a novice. But I know that precision
timing and Geodetic location of
monitoring instruments is a fundamental baseline to what VLBI, Plate
Tectonics, GPS, do.
So if anyone is interested in a vast resource of Geo Location information,
with huge networks of PBO sites, check the UNAVCO site out:
http://www.unavco.org/data/gps-gnss/gps-gnss.html

Some friends that manage the Pisgah radioobservatory mentioned to me that
they have a UNAVCO 24/7 precision GPS permanent
station on Pisgah, that has two large dishes, once used for military
surveillance purposes. Used to be known as the Rosman site.
They do Educational and research activities now. their site:
www.pari.edu
I don't know if this list accommodates images, but I will imbed one of the
UNAVCO site that exists on the PARI site.
if it does not print here, then go to the site, for the same image.
Here is a PBO site at Pisgah Observatory:






Best, 73, Pat Barthelow AA6EG
apol <***@gmail.com>***@gmail.com


*"The most exciting phrase to hear in Science, the one that heraldsnew
discoveries, is not "Eureka, I have found it!" but:*
"That's funny..." ----Isaac Asimov
Patrick Barthelow
2018-05-01 10:51:17 UTC
Permalink
Sorry, folks, I sent the message too soon before completion.
Anyway, Check out the PARI.edu website to see if it is of value to you.
And also the data rich, UNAVCO site.

http://www.unavco.org/data/gps-gnss/gps-gnss.html

Here is the picture of the PBO GPS observatory on the PARI radio dish site:
The form factor of the PBO sites is fairly universal. If you see a similar
domed instrument on a permanent tripod
it is probably an PBO site. PBO networks are concentrated in Western USA,
but unusually, put this one
In The Asheville, N.C. location of PARI.

https://goo.gl/maps/4n79WnRv1Cx


​

Best, 73, Pat Barthelow AA6EG
apol <***@gmail.com>***@gmail.com


*"The most exciting phrase to hear in Science, the one that heraldsnew
discoveries, is not "Eureka, I have found it!" but:*
"That's funny..." ----Isaac Asimov
Post by Patrick Barthelow
Friends,
I have viewed with interest recent discussions of GPS datums, and
accuracies, and GPS precision use methods.
What I offer here, may or may not be well known amongst the group.
I am researching how to precisely locate and monitor, Astronomical
instruments that are used in VLBI studies
I have discovered a way to locate the optical (or microwave) path and
geodetic location of the prime focus of, a large parabolic dish on
the various Geodetic references, (geoid, spheroid, ellipsoid) with
extreme precision. And to do so to even accommodate where the prime focus
is, as the dish or
Telescope moves in Azimuth and elevation.
A govt agency called UNAVCO, has publicly available data networks
primarily in Western USA of PBO Plate Boundary Observatories
​
that Monitor with extreme precision, the location and time history of each
PBO site, to mm precision.
I am not an expert at VLBI, rather a novice. But I know that precision
timing and Geodetic location of
monitoring instruments is a fundamental baseline to what VLBI, Plate
Tectonics, GPS, do.
So if anyone is interested in a vast resource of Geo Location information,
http://www.unavco.org/data/gps-gnss/gps-gnss.html
Some friends that manage the Pisgah radioobservatory mentioned to me that
they have a UNAVCO 24/7 precision GPS permanent
station on Pisgah, that has two large dishes, once used for military
surveillance purposes. Used to be known as the Rosman site.
www.pari.edu
I don't know if this list accommodates images, but I will imbed one of the
UNAVCO site that exists on the PARI site.
if it does not print here, then go to the site, for the same image.
Best, 73, Pat Barthelow AA6EG
*"The most exciting phrase to hear in Science, the one that heraldsnew
discoveries, is not "Eureka, I have found it!" but:*
"That's funny..." ----Isaac Asimov
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