I finally got the Homemade CORS on the chimney using a GSR2300 receiver. (Z Surveyor)
I have installed DATALOGR on the XP box. Upped the BAUD rates to the highest and I am recording at a 0.2 second interval. There is reason for the rate as we are getting a mobile lidar unit. Of course, upping to a GNSS would be even better, but we all have to start somewhere. Also those ring clamps to strap the mount work temporarily, but will be improved.
So... now I need help with DATALOGR or another program that will allow me to run this 24-7 while uploading to a drive or the web. My computer guy is ready to write some scripts but if there is a way to get DATALOGR to work the way I want it or if there is another program (perhaps on that ftp.ashtech.com site) then I would be grateful for the help. There seems to be a ton of good stuff on that Ashtech site, but it is so cryptic one really needs to know what they are looking for unless they spend all the time working with each archived product.
Hi,
fine business ! Thanks for posting, very interesting!
br
I.A.
I suspect there will be a lot of this happening in the near future as the used GPS market gets bigger and equipment closets get cleaned out. Lots of old receivers that could be repurposed for this.
And another use for old hub stakes.
(I've been using mine as kindling)
That is cool, Thad (the whole set-up)
Bob
1. Do you worry about heat from chimney damaging the GPS?
2. If you are in area that does not operate a "free" RTN, I always thought it would be cool if a few surveyors got together and started their own. Like each surveyor who puts up a CORS gets access to the others... it looks like there are RTN products now that are almost "plug and play".
1. The chimney was abandoned 30 years ago when the building was lifted and set on a new foundation. Dad forgot that they eliminated access from the basement to the chimney. We tried getting a conduit down the chimney for a couple hours on Sunday until he remembered they built a shelf between the 1st floor and basement. If this becomes official, we may fill the chimney with concrete and set the rod.
2. Perhaps someday we will get to the RTN. Right now I am more concerned with local static data. The next one of these will go on my house or an engineer's office a few miles away. Then I can create network solutions with one unit.
I have not been able to log a 24 hour file yet. The DATALOGR software saves by Julian date and yesterday's file terminated at midnight.
I'm glad someone noted the stakes. I set this up in 2009 when my Hiper Base had a bad battery. I could put it up here with power and RTK all day long. It's still tight; I will see if the solution is the same!
Spledeus, check out this CORS Software. http://rvdi.com/zbss/index.html
The last time I checked they have a 30 day free trial, and can also broadcast real time corrections, if the receiver is capable of RTK. When I looked at it before, it was $500 for a full license.
:beer:
In addition to archiving the data, you may want an NTRIP server and an NTRIP caster. The server takes the real time data from the receiver and sends it to the caster which makes it available to clients (you) in real time.
We put one up in 97, moved it in 2003 and it's been up the whole time, still going, it only collects data when one of us needs it, so it's not a CORS. There is also an antenna so radio signals are available if a trimmark is hooked up. One big thing to consider is lightning protection. That is something for a professional, found out it's not all that simple to do.
Had an electrician spec out the lightning device and install the ground.
I've been running it sort of 24-7, but I am still searching for the freebie CORS software. I think I can code ASHCOM to work, but I still need to review.
My first 18 hour log went to OPUS. The mast was setup in 2009 and I established a position locally.
My differences:
0.004' N
0.038' E
0.061' Z
If the weather breaks today I will be running 4 other units in a bow tie configuration on 4 control points. 3 are H and V points, one is only V.
How fortunate it is to be between an airport, a coast guard station and a tidal station with a level run heading down the road. Thank you NGS for all the control!
If you haven't yet, you might consider the NAD83 velocities at that point. They'd add up in 5 years to something noticeable most likely. Might compensate for some of that difference. (Which isn't all that bad, by the way).
