Ok, I have some GPS observations that are just blowing my mind.
Chris and I observed some GPS points yesterday. The points are in Southaven, Desoto County, Mississippi.
I took one receiver, and occupied a GPS point (Benchmark) that was established by the company that Chris used to work for. I took what I thought was a two hour occupation on it yesterday.
Chris took two receivers and went to a jobsite, and set both receivers up, and let them start collecting data.
Everything looked okay in the field. I downloaded the data this morning, and submitted the files to OPUS. The first file, that I thought was 2 hours, ended up only being 1:30 minutes long, so I had to submit it to OPUS-RS. I then submitted the two other files after that to OPUS-RS without incident. Those occupations were about an hour long for one, and an hour and a half for the second one.
I imported the rinex files into Topcon Tools, and that is where I started seeing issues. The one point that I occupied plotted in Tennessee, about where my office is, so I went back and looked at the OPUS reports, and the one benchmark returned with Tennessee State Plane Coordinates.
I then looked at the occupation view, and looked at the information on one of the points on site has occupation dates from 1-1-88 thru 1-28-2014. The OPUS report for that point looks good. The second point on the jobsite looks okay.
I am totally confused about what has happened. We did not do anything different than we normally do. We are heading back out there on Friday morning to reobserve, but I am looking for answers as to what could have happened, to possibly prevent this from occurring in the future.
Thanks in advance,
Jimmy
Please don't throw something at me ...
for asking what may be a silly question, but are you sure you used the correct file? It was half hour shorter than you thought and it wasn't where you expected. Sounds like you grabbed the wrong file.
Please don't throw something at me ...
I don't delete files from my Trimble 4000sse's that I use for static work until I'm tight for space. More than once I've almost downloaded the wrong file because of how they're named and organized in the unit.
Please don't throw something at me ...
Darn Dave,
It looks like I may have grabbed the wrong file. I am not used to this new download software for my new GPS receiver. It looks like I did have the wrong file highlighted when I submitted to OPUS. The rinex file is named much different than what I am used to seeing.
Thank you so very much for helping with that. It has been one of those days.
Jimmy
Would Not The Dates Give You A Clue?
But hey, I have enough boneheaded errors to overfill Wendell's website.
I had a boss come up to me about 35 years ago, his exact words were;
"We all learn from our mistakes, but you are learning too much."
Paul in PA
Please don't throw something at me ...
Jim,
I think you grabbed the correct file. It's the " 1-1-88 thru 1-28-2014" that tells me the Topcon receiver was reset (NVRAM cleared) and had no ephemeris for the first part of your session. It appears it took nearly 30 minutes to catch up with enough SV's and a correct ephemeris.
Topcons default date is 1-1-88 when ever the NVRAM is clear in the receiver. Perhaps this receiver was NOT used in the few weeks, or batteries were dead since last turned on.
That's a good one Paul, mind if I use it?
About 30 years ago I overheard an employer tell another employee:
"There is only one thing keeping me from paying you what you-re worth."
"What's that boss?"
"The minimum wage law."
That's a good one Paul, mind if I use it?
I don't know if you use Carlson in the field , but you can use it with topcon receivers or others to start and stop static files , and give the files names rod heights etc. so when I import my static files into topcon tools rod heights are correct and they are already named.
Please don't throw something at me ...
Lee,
That makes sense. I seem to vaguely remember one of the Hipers, sitting in the case last week or so and being dead. I forgot to put them in Zero power mode.
I looked at the file again, and there was only about 5 minutes or so of observations in the rinex file that had the 1988 date. I am not very familiar with rinex files at all, at least not editing them.
Yea, I was pretty stumped for a little while until everyone started offering suggestions abd helped me figure out what happened. I am new to the OPUS X90 download software, and I did indeed have the wrong file highlighted when I exported the rinex file and automatically uploaded to OPUS.
As always, every day is a learning experience. This one definitely went into my notes to check on things while I download my static files.
Thanks again for all of the suggestions. They were very helpful.
Jimmy
