located the east and north lines of a Section 7 Monday morning. I like to have redundant numbers, so I did short static sessions on each monument and two RTK locations. The cool thing is that if you allow the receiver to "see" open sky while you travel between points there isn't a long time to fix and refix for the short static sessions.
In the office downloaded the base and data collector and processed the static sessions and everything looked real good. Then added the closest CORS point (30miles away) and that also checked after processing. Then just for fun I tried to tie to the next nearest one (90 miles) and even though these were only 3 to 3 minute sessions they also processed and checked.
GPS is just amazing when you treat it right 😀
from 90 mile CORS
lat-41.02400"
long-28.80004"
HT-4007.47'
from 30 mile CORS
lat-41.02422"
long-28.800804"
HT-4007.50'
Pt#87
from 90 mile CORS
lat-57.62947"
long-29.76672"
HT-4020.90'
from 30 mile CORS
lat-57.62997"
long-29.76754"
HT-4020.96'
These results are really amazing when considered that the session lengths were 2min and 35 sec for Pt#86 and 3min and 2sec for Pt#87
It looks as if the ionosphere has been amazingly quiet of late after that last disturbed period of solar flares.
Planetary Kp Index for 24 hrs.
That's a Kp index value of less than 1.3, which is really, really quiet.
Too quiet
> Too quiet
You hit the nail on the head ....
when you said - "GPS is just amazing when you treat it right".
You hit the nail on the head ....
The office rented a unit to the county in 1997 to locate county roads, they wanted a "rough" inventory of all the roads and drove the centerlines with a L1L2 antenna and 4000 unit mounted on an SUV roof.
They would drive the road in PPK continuous topo mode collecting a location every 5 seconds. When crossing a feature like a pipe or cattle guard he would stop and locate it, then continue on. The file would then be post processed using our base at the office. What I was surprised at was the accuracy of the points, when checking pipe crossings or cattle guards they always were within a couple of tenths vertically, so I began to test out just how accurate you could get a location in PPK even with long distance vectors and the results have been surprising.
Even 70 miles from the base the locations are very good. Of course road locations eyeballed along the center of a gravel road is one thing, but when I checked into monuments within a tenth, then I realized just what a powerful tool I had. But you have to use it correctly. Prep time is everything
