Subject: Re: Trimble 4000 SSI GPS unit
From: rawlings@mozart.inet.co.th (Stephen Rawling)
Date: 30 Sep 1996 07:25:57 GMT
Stephen Rawling (rawlings@mozart.inet.co.th) wrote:
| J. Anthony Cavell, PLS (GPSman@net-connect.net) wrote:
| | Stephen Rawling wrote:
| | >
| | >
| | > May I suggest that Trimble have the best Margeting team in the GPS business.
| | >
| | > Oh yes, the 4000 SSE,SSI have a very good battery power management
| | > system. It would be mean of me not to give credit there!
| | Dear Stephen:
| | If that was so, their competition would be about as popular as Beta
| | version VCR's.
| | Good luck,
| | --
| | J. Anthony Cavell, PLS _______ ______
| | Vice President /_____ / / @ \ /____ /
| | Navigation Electronics, Inc. /_____ /===(@ % @)===/____ /
| | 200 Toledo Drive /______/ \ @ / /_____/
| | Lafayette, LA 70506 "G P S m a n"
| -------------------------------------------------------------------------
| Oh goood, it looks like we have at last got an interesting thread going.
| Keep it goin fellas
| Anyway....
| I find that the amount of cycle slips with a SSE receiver + compact
| L1/L2 antenna without a ground plane is higher than should be expected.
| I have measured more than one static baseline where an SSE/L1/L2 antenna
| ith no groundplane at one end gave 20-30 cycle slips and a SST/SST
| Geodetic antenna at the other gave no cycle slips. No obstructions at
| either site. Swapping equipment /stations gave same result.
| Processing with Trimvec software circa v4 on data containing lots of
| cycle slips aint good- forget dual frequency unless you have the odd day
| or so to manually fix the massive number of sv/epoch combinations.
| Here's a one off for you all.
| A SSE receiver in quick start mode cycle slips on every epoch for every
| SV. Start up on a predefined session and all is OK- lousy S/N but that's
| nothing new. Anyone ever experienced that?
| Maybe I had a defective unit??
| ----------------------------------------------------------------------------
| Cheers all
| Steve Rawling
Anyone ever used Premier GPS Junior Surveyor?
A system (2 units +post processing software for +/- 1cm +/-2pp) for < $10k!
Subject: Re: County Surveyors Office
From: stevers@ac.net (S. R. Sheffield)
Date: Mon, 30 Sep 1996 14:08:35 GMT
copls@aol.com (CoPLS) wrote:
>I would like feed back from other surveyors, concerning County
>Surveyors. Should a County Surveyor be allowed to practice in the
>private sector?
>Does your state or county have a position for county surveyors?
>If so, do they also have a private practice?
>Are there a conflicts of interest in such cases?
>Do you feel a County Surveyor has an unfair advantage in the
>private sector? If so, why?
>Ron PLS Colorado
Here in a county in North Carolina, the office of *County Surveyor*
has essentially been done away with. I believe the office was created
a couple of hundred years ago to fill a need for soneone to survey the
grants and subsequent divisions needed. Since then, the profession
has progressed into the private sector sufficiently to where the
Office of County Surveyor is no longer needed.
As to the matter of a county surveyor competeting with the private
sector,
NO!!!!! under any circunstances.
It is virtually impossible to separate your *county* time with
*private* time when you are in constant contact with the public.
I believe the County Surveyor has an unfair advantage when he uses
*county* time to cultivate a client base while having his overhead
paid for by you (as a tax payer).
Just my own opinion.
Steve
Subject: RE: VERTCON Program
From: dmulcar@ibm.net (Donald M. Mulcare)
Date: 30 Sep 1996 19:13:27 GMT
Given the interest, here is an extract of the document file for the
VERTCON program. N.B. the limitations; the program is intended
for mapping level accuracies. To get an idea of how
good the model is in your project area, determine shifts at the
four geographic corners and see whether shifts are consistent.
The conversion factor can be considered to be a constant value
if the maximum difference between conversion factors at all
locations is within 0.1 foot. FEMA suggests that, at a minimum,
the four corners on the USGS Quad map be used as the test points,
the 0.1 foot test should be used.
The VERTCON 2.0 Model
The VERTCON 2.0 model was computed on May 5, 1994 using
381,833 datum difference values. A key part of the comput-
ation procedure was the development of the predictable,
physical components of the differences between the NAVD 88
and NGVD 29 datums. This included models of refraction
effect on geodetic leveling, and gravity and elevation
influences on the new NAVD 88 datum. Tests of the predictive
capability of the physical model show a 2.0 cm RMS agreement
at our 381,833 data points. For this reason, the VERTCON 2.0
model can be considered accurate at the 2 cm (one sigma) level.
Since 381,833 data values were used to develop the corrections
to the physical model, VERTCON 2.0 will display even better overall
accuracy than that displayed by the uncorrected physical model.
This higher accuracy will be particularly noticable in the eastern
United States.
It should be emphasized that VERTCON 2.0 is a datum transformation model,
and can not maintain the full vertical control accuracy of geodetic leveling.
Ideally, one should process level data using the latest reduction software
and adjust it to established NAVD 88 control. However, VERTCON 2.0 accuracy
is suitable for a variety of mapping and charting purposes.
The VERTCON 2.0 model expresses datum differences between NAVD 88 and
NGVD 29 due to removal of distortions in the level data, as well as due
to the physical differences in the height systems. In some rare cases,
these local NGVD 29 distortions could be 20 cm or more. If both ends of
your old vertical survey were tied to one of these "problem" lines, then
the datum difference of the problem line is appropriate to use to transform
the survey data. If both ends of a vertical survey are tied to "undistorted
lines", then it is appropriate to use a slightly distant point to compute the
transformation, no matter how close your survey data may approach a given
problem line. The possible presense of a problem NGVD 29 line in the
vicinity of your survey will become evident if dramatically different datum
transformation values are computed within a small area.
It must also be emphasized that VERTCON 2.0 is not to be considered reliable
beyond the boundaries of the lower 48 United States. The VERTCON program
will interpolate values in Canada, Mexico, or in the ocean, due to the grid
structure of the model. Those values do not contain important model
components present in the conterminous U.S. model. Future versions of
VERTCON may be extended into neighboring countries.
|<<-------------------------------------------------->>|
|>> Donald M. Mulcare..........email:dmulcar@ibm.net-<<|
|>> NGS Advisor to Maryland.....410.333.1240 (phone)-<<|
|<<----------------------http://www.ngs.noaa.gov----->>|
Subject: Re: Surveyor's Right of Entry
From: adamw10331@aol.com (AdamW10331)
Date: 1 Oct 1996 22:12:43 -0400
In article <324FE66D.39DD@synapse.net>, Chris Hall
writes:
>David & Lorri Ferguson wrote:
>
>> I'm trying to find what legislation different jurisdictions have
>> concerning a land surveyor's right (or lack thereof) of entry in the
>> course of normal business. I am particularly interested in any laws
>> concerning access to railroad tracks.
>
>Railroad tracks are private property, not public utilities, therefore
>the same laws that apply to regular private property also apply to RR
>lines.
>
>
I recently wrote a letter requesting permission to enter RR property in
order to profile 900m of track. No one responded after 4 weeks. After 2
days of phone tag, I finally got verbal permission to enter their
property. According to the project engineer, federal safety regs.
requires permission and an escort.
If surveyors go through the proper channels to obtain permission, why
can't RR representatives have the decency to reply in a timely manner??
Subject: SMI Data Collection: Enhanced Surveying Software
From: Justin Dossey
Date: Wed, 2 Oct 1996 15:55:45 +0000
I have the SMI Data Collection Enhanced Surveying Software card for the
HP48GX calculator. The software version is v4.3. This card helps
automate the data collection process for land surveyors and civil
engineers by eliminating the need to manually enter data for analysis. I
am neither a surveyor nor an engineer, so I want to sell the card. Please
email me if you are interested (dossey@ou.edu). Thanks!
Oh, if you're worried about things that come with it (template,
instructional video, manual) or the software version, I have answers
to those questions.
:justin dossey
Subject: Re: Trimble 4600 and PC's
From: stever@mindlink.bc.ca (Steve Robertson)
Date: Wed, 02 Oct 1996 15:52:17 GMT
In <52bv48$j2s@everest.vol.it> (25 Sep 1996 18:54:00 GMT),
sencoit@mbox.vol.it (sencoit@mbox.vol.it) wrote:
>Anybody knows where to find a PC software for controlling this unit ?
>I need for replacing the TDC1 controller and integrate in a custom
>program.
>
Trimble used to have software called LOGST which would log data from
a 4000 series receiver to a PC via the serial port. It was
distributed with the TRIMVEC program. I just checked my computer, and
the last time I installed GPSurvey (v2.1 a couple of months ago), it
was still included.
I have not used it for a while, but if I remember right LOGST could
turn a receiver on, collect any data the receiver was capable of
(L1,C1,D1, L2,P2,C2) and put it in the DAT format, from which
conversion to RINEX is easy.
LOGST is a DOS program, but you could probably run it in a window if
your computer has enough power. If you have 4600LS receivers, you
should have GPSurvey and LOGST delivered with it.
steve
==========================================================================
Steve Robertson stever@mindlink.bc.ca
Tangent Survey Systems
302 - 1728 Second Avenue East tel 604.255.8754
Vancouver, B.C. CANADA V5N 1E2 fax 604.255.0599
==========================================================================
Subject: Re: Starplus Software.
From: stever@mindlink.bc.ca (Steve Robertson)
Date: Wed, 02 Oct 1996 15:52:24 GMT
In <844154699snz@markland.demon.co.uk> (Tue, 01 Oct 96 07:24:59 GMT),
mark@markland.demon.co.uk (mark johnson) (mark johnson) wrote:
>Star*Net---Survey Control Programme.
>
>Written by Starplus Software , Inc.
>
>Does anyone use it? I have a demonstration version, which is
>limited to 10 survey stations. I have to say that I am very
>impressed by its performance, but not so much by its cost.
>
>I believe that last time I priced it, it cost some 800 UK pounds.
>
>What cost is in the USA. ??
>
>We are always led to believe that prices are less there..!!
>
About $900 here in Canada. Not too powerful, but fast and easy to
use.
steve
==========================================================================
Steve Robertson stever@mindlink.bc.ca
Tangent Survey Systems
302 - 1728 Second Avenue East tel 604.255.8754
Vancouver, B.C. CANADA V5N 1E2 fax 604.255.0599
==========================================================================
Subject: Re: Surveyor's Right of Entry
From: ou81tuu@aol.com (OU81TUU)
Date: 3 Oct 1996 04:28:46 -0400
In article <52sj2r$mll@newsbf02.news.aol.com>, adamw10331@aol.com
(AdamW10331) writes:
>
>>David & Lorri Ferguson wrote:
>>
>>> I'm trying to find what legislation different jurisdictions have
>>> concerning a land surveyor's right (or lack thereof) of entry in the
>>> course of normal business. I am particularly interested in any laws
>>> concerning access to railroad tracks.
>>
If you trespass on the RR property it's the same as private. Although
they have a much more efficient attorney service !!
>In article <324FE66D.39DD@synapse.net>, Chris Hall
>writes:
>
>I recently wrote a letter requesting permission to enter RR property in
>order to profile 900m of track. No one responded after 4 weeks. After
2
>days of phone tag, I finally got verbal permission to enter their
>property. According to the project engineer, federal safety regs.
>requires permission and an escort.
>
>If surveyors go through the proper channels to obtain permission, why
>can't RR representatives have the decency to reply in a timely manner??
I personally have surveyed several times on RR R/W and have found the
smartest thing to do is work with the RR people.
Like most entities that we work with you have to find and know the
RIGHT people. Once you do, you will find that to know
when the train is coming is the very important. Here in S. California, on
the main line, these trains are going 85 MPH and the
engine is most of the time in the back, so you can't even here it coming
!! Taking the time and the expence to have a flag man
and to know the sch. is the very least thing that you can do for your
crews.
Now what I have a gripe about is why in the hell they use the chord
basis for there curves ??
**********************************
* Rick Turner LSIT *
* San Diego California *
* USA *
* OU81TUU@AOL.COM *
**********************************
Subject: Education for L.S.I.T.
From: CNZT72A@prodigy.com (Jack White)
Date: 3 Oct 1996 22:12:23 GMT
From: Jack White
Subject: Education
HELP!!!. I am an up and coming Land Surveyor currently employed as a
Party Chief with 8 years field experience. I am hoping to take my
Proffessional Land Surveyors Exam before the "grandfather clause" expires
and all applicants will be required to have a four year college degree,
which brings to the subject:EDUCATION.
I am currently taking the Survey Technician Certification Exams as a
preporatory background for the Surveyor's Exam. Working mostly with
small firms doing mortgage surveys my knowledge in varied aspects of
surveying are limited. Having a family negates the possibility of
quitting work and going to a major university for a four year program in
surveying.
Where or how can someone become educated in the different aspects of
Land Surveying? I attend as many seminars as possible and find most of
them informative and full of information from the well-seasoned
Proffessional Surveyors, but how many times can you take M.T.S. or
Florida Surveying Law?
If there is anyone out there who knows of Study Workshops, Exam Prep
Classes,
Correspondence Classes or anything related to the continuing education of
a Surveyor-In-Training, please drop me a letter or an e-mail.
Thanks,
Jack White
10369 108th Ave. North
Largo, Fl.
33773
E-mail- jacwhite@prodigy.com
Subject: Re: Education for L.S.I.T.
From: rhc3@cornell.edu (Bob Chiang)
Date: 4 Oct 1996 18:40:58 GMT
In article <531do7$2nf4@usenetp1.news.prodigy.com>, CNZT72A@prodigy.com
says...
>
>From: Jack White
>Subject: Education
>
>
>
> HELP!!!. ...
> If there is anyone out there who knows of Study Workshops, Exam Prep
>Classes,
>Correspondence Classes or anything related to the continuing education of
>a Surveyor-In-Training, please drop me a letter or an e-mail.
>
>
>
> Thanks,
>
>Jack White
> 10369 108th Ave. North
> Largo, Fl.
> 33773
> E-mail- jacwhite@prodigy.com
>
>
Hi,
regarding your and Mr. Caccavano's posts regarding survey courses: The
universities of Maine and Wyoming offer correspondence courses via video tape
(and other means). I know Maine has one on Legal aspects of Land Surveying
($398 for 17 tapes and course notes, another $95 to take a written exam for a
certificate). Wyoming offers Engineering Surveying, Advanced Route Surveying,
and Surveying Boundary Control and Legal Principles.
Contact:
Center for Engineering Studies
USM
96 Falmouth Street
Portland, ME 04103
800-343-4928
207-780-4606 (fax)
or
UW Correspondence Study
PO Box 3294
Laramie, Wyoming 82071-3294
800-448-7801 ext. 4
307-766-5632
Best of luck and don't forget your HP calculator.
Bob Chiang, LS
Ithaca, NY
Subject: Re: Trimble 4600 and PC's
From: dnt@canam.com
Date: Fri, 04 Oct 1996 01:22:47 GMT
stever@mindlink.bc.ca (Steve Robertson) wrote:
>In <52bv48$j2s@everest.vol.it> (25 Sep 1996 18:54:00 GMT),
>sencoit@mbox.vol.it (sencoit@mbox.vol.it) wrote:
>>Anybody knows where to find a PC software for controlling this unit ?
>>I need for replacing the TDC1 controller and integrate in a custom
>>program.
>>
>Trimble used to have software called LOGST which would log data from
>a 4000 series receiver to a PC via the serial port. It was
>distributed with the TRIMVEC program. I just checked my computer, and
>the last time I installed GPSurvey (v2.1 a couple of months ago), it
>was still included.
>I have not used it for a while, but if I remember right LOGST could
>turn a receiver on, collect any data the receiver was capable of
>(L1,C1,D1, L2,P2,C2) and put it in the DAT format, from which
>conversion to RINEX is easy.
>LOGST is a DOS program, but you could probably run it in a window if
>your computer has enough power. If you have 4600LS receivers, you
>should have GPSurvey and LOGST delivered with it.
>steve
>==========================================================================
> Steve Robertson stever@mindlink.bc.ca
> Tangent Survey Systems
> 302 - 1728 Second Avenue East tel 604.255.8754
> Vancouver, B.C. CANADA V5N 1E2 fax 604.255.0599
>==========================================================================
Steve.
I may be mistaken, but I believe the 4600LS uses a different comm
protocol than the 4000 series. This means that LOGST won't work.
Figures. eh?
I've been told that you have to use the Universal Reference Station,
sold separately... batteries not included.
I guess that Trimble feels that no one would need it anyway with the
increased memory of the 4600's
Scott
Subject: Re: PLS Exam Preparation
From: "Shelby H. Griggs"
Date: Fri, 04 Oct 1996 23:01:07 -0700
Michael Caccavano wrote:
>
> I am preparing for the PLS exam in Oregon next Spring and
> would appreciate suggestions for obtaining review
> materials, courses I can work on at home, etc. I have the
> NCEES candidate handbook with sample questions but could
> use a study guide. It has been 12 years since I took the
> LSIT/FLS exam so I am a little rusty on some of the topics
> I don't use every day.
I took the OR test in Oct, 92, but only the PM Portion as I already had a
CA ticket. I can not speak for the full 8 hours, but the PM portion dealt
mostly with state laws, legal desc., etc. There was no problems that
required me to use my HP41. Brush up on boundary and state law and you
should be OK. (At least for the state specific portion!) I think there is
a review class offered at OSU each spring, just prior to exam time. Good
luck!
Subject: Re: Starplus Software.
From: "Shelby H. Griggs"
Date: Fri, 04 Oct 1996 23:15:55 -0700
mark johnson wrote:
>
> Star*Net---Survey Control Programme.
>
> Written by Starplus Software , Inc.
>
> Does anyone use it? I have a demonstration version, which is
> limited to 10 survey stations. I have to say that I am very
> impressed by its performance, but not so much by its cost.
>
> I believe that last time I priced it, it cost some 800 UK pounds.
>
> What cost is in the USA. ??
>
> We are always led to believe that prices are less there..!!
>
> Regards
> --
> Mark JohnsonIf have used the Star*Net package, and am planning on purchasing the GPS
version soon. It is very fast, and powerful. The interface is DOS, but I
would expect to see a Windows 95 Ver in 1997. That may or may not be an
improvement. The interface most likely will be better, but I suspect
there may be a trade off in speed. It is so fast that you can do many
what ifs, in a very short time. For GPS I have used Star*Net, Leica
Adjustment, TrimNet and GeoLab. In the speed department, it is many times
faster than any of the others. The features are also great. Support is
outstanding, with very quick fixes, sometimes within hours or days of a
report of finding a bug or problem. There is currently (or very soon) a
US$200 price reduction special ongoing. (No I do not work for Star*Net!!)
I think the price is worth it, as the saying goes, you get what you pay
for.
Subject: Need info on 3D conformal transformation - photogrametry
From: "Eduardo Marreiros"
Date: 5 Oct 1996 19:12:28 GMT
Hi folks,
I'm in the process of writing an implementation of the 3D conformal
transformation algorithm. It's supposed to convert coordinates into two
representations of the terrain.
Does any of you know where can I find INFO on this subject. What I really
need is the mathematical information to calculate the 3D transformation
matrix to convert points from coordinate system A into coordinate system B,
using redundacy (least squares...)
TIA, Eduardo Marreiros
PS-1. I have "Elements of Photogrametry - McGraw Hill (1974)", but there is
a precious bit of information missing: the initial values for the Taylor
series...
PS-2. Could you be so kind to reply to me, as I do not have access to the
news very often... (thanx)
Subject: free software
From: dine@powerup.com.au (otogrammetric, block, adju)
Date: 6 Oct 1996 06:25:33 GMT
I have retired from full-time surveying activities and now work part time at the QUT
(Queensland University of Technology, Australia) lecturing, demonstrating and tutoring. I have several least
squares adjustment programs available for free distribution, such as horizontal control surveys, level control surveys, photogrammetric model block adjustment, conformal and affine transformation, etc.
I am also interested in exchanging ideas on teaching in the use of photogrammetric equipment such as the MPS2, Visionary and the Planicomp C100. I have written several procedures for students to follow in the operation of this equipment.
Anyone interested, give us a call at: dine@powerup.com.au
Peter Spierings.