Survey Data - National Geodetic Survey 2000 Frequently
Asked Questions
On this page, visitors will find a list of questions and
answers that are related to the NGS 2000 here in Maine.
Please scroll down to see the complete list of questions.
Frequently
Asked Questions about NGS 2000
Q. Who do I talk to about adding a Geodetic point to the National
High Accuracy Reference Network (HARN)?
A. Please contact Tim LeSiege at the Maine
DOT at (207) 624-3493, or email him at mdot.survey@maine.gov. You may mail
to him at Maine DOT Survey Section 16 State House Station, Child
St. Augusta, Maine 04330. In addition to notifying Mr. LeSiege,
please fill out the "Co-observer Sign-Up Form" at http://www.ngs.noaa.gov/ADVISORS/FBN/
.
Q. What is the minimum piece of equipment is needed
to join the observation party? A. A dual frequency (L1L2) geodetic
grade receiver. NGS needs to have the antennae phase patterns on
record, these can found at http://www.grdl.noaa.gov/GRD/GPS/Projects/ANTCAL/
.
Q. How long is an observation? A. Each point must be observed 3 times for five hours each
time (15 hours per point). Each session (5 hours) must be
done on different days at different times of the day. Q. Who is processing
all of the data?
A. NGS is responsible for processing all of the data. Q. Who is paying for all of the work being done? A. I don’t know. I believe each person / firm is responsible
for their own time and costs. Q. Will this substantially change the coordinate
base in Maine? A. It is my understanding
that the positions may shift slightly (under a centimeter or two).
If this is the case I am being told that the coordinates will not
be changed anytime soon.
Q. Who is in charge of the re-observation? A. NGS is the lead unit. MDOT is the liaison for Maine based
participants. Q. Where can I get more information? A. See the website at http://www.ngs.noaa.gov/ADVISORS/FBN/ Additional
Information since the April 28, 2000 MSLS meeting.
Q. Does an electronic
format for the Federal Blue Book format exist?
A. Yes, called DDPROC
and it can be found at http://www.ngs.noaa.gov/FGCS/BlueBook/
Q. Is a fixed height tripod mandatory? A. Only for FBN points, CBN (Cooperative Base Net) points
can be occupied with an adjustable height tripod. There are,
however, additional information and multiple measurements
to be taken and can be seen on the observation log. Q. Can points
be occupied for B order accuracy?
A. Anything occupied for less than A order accuracy (5hrs
3 times), will not be adjusted by NGS. Q. What level monumentation is necessary? A. See NGS Station requirements at http://www.ngs.noaa.gov/ADVISORS/FBN/ .
(we would like A, B or C order Monuments)
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