As a general rule:
From a known base. How long to you occupy a control point when establishing new coordinates in an RTK session? No canopy, lots of birds.
Always found that the guano deposited on the antenna, was a linear progression based on time and the concentration of birds.
jud;-)
> How long to you occupy a control point when establishing new coordinates in an RTK session?
Control for what? Control for topo of park open space would be managed differently from control for floodplain mapping.
180 epochs (3 minutes) and it gets shot again later under a different constellation. This is for control
The other stuff gets 30 second shots.
Just depends.
If it is control of any quality, then I will occupy it for about 30 seconds, for intial control, but unless it is for just topo, I will almost always set up a static session on the point as well. It is just cheap insurance.
> As a general rule:
>
> From a known base. How long to you occupy a control point when establishing new coordinates in an RTK session? No canopy, lots of birds.
In Trimble terminology, 3 minute observed control opoint, I usually also shoot three or four 4 sec topo points on that same point just to see the differences, which is not that much horizontally but the 3 min point really tightens up the vertical vs. the 4 sec topo point, from 0.05' to 0.25' to 0.05' to 0.10'.....sometimes is is hard to acheive less than 0.10' but not normally, it is usually doable.
Wouldn't that depend on the network available to establish control? Maybe I misunderstood.
control for boundary survey network.
From GPS World
Breaking lock/resetting RTK, resetting ambiguities/etc. or whatever your manufacture calls it is the critical part of that picture.
Simply taking more shots with the same solution can be a little deceiving, in my experience.
Snoop, why don't you try following the NGS guidelines...
http://www.ngs.noaa.gov/PUBS_LIB/NGSRealTimeUserGuidelines.v1.1.pdf
Well gps is quick so the time to redo a CRITICAL point under
" fill in your sky cover for a site variable to make this post work "
to restake your first 0-3 min position is not much time versus
IE break out the robot and start traversing.
Are we in light bush or open sky modern Gps so on ???
What are the project deliverables for XYZ
1cm
2cm
3cm
what works to the end product
modern RTK has place but i am lucky to have a 1 sec 1mm robot for the No no rtk
IS there a general rule ??? most likely not just trial and not work experience.
Peter K
> Snoop, why don't you try following the NGS guidelines...
Thanks Joe. Snoop, skip directly to page 46.
YOU GUYS ARE AWESOME!
THANKS!!
With the older Trimble units (4000, 4700, 5700) we would run 2 to 3 hour sessions. With the newer units ( 8900 or SRS900) it only takes 15 seconds to set a control point. If you are just measuring or sreaking out, it takes less than a second.
RTK occupation time, minor hijack
poll;
how many of you record the data for postprocessing?
as a static and kinematic user, i am forced to do this.
for those that answer no, why not? wouldn't you want data to support your published coordinates/values? if you don't record and post process, all you have is a vector with a variance/co-variance matrix, right?
just seems, to me, to be trusting the magic box of knowledge without any other analysis...
Use static for control.
RTK for topo.
:coffee:
I agree 100%. Static for control, and rtk for topo.
+1 for static (min. 4 hrs.) on control and RTK for topo.