hey guys this board has slowed down alot, but anyway this week I was able to use the kinematic feature on my last survey, pretty nice, I was doing topo on a city water resevior, I did a 6 acre topo by myself,I used my topcon apl1-a to get the shots that the kinematic wouldnt get, I also checked some of the kinematic points with the robot, I was very pleased with the comparison .04 to .10 horizontal .03 to .07 vertical not to bad on most surveys. Made me think about getting rid of my employees and take half the work and go solo.
Q. When you need to initilize on a existing control point (not with the bar )how do you let the data collector know this is a initialation point?

Just change the point number to the known's number, then take your regular 10 or 12 second (whatever you usually use) observation.

Don't say "Y" to Kinematic Init Point in the handheld, or it'll make you stay there for the 300 seconds.

Thanks Lou

If this occupaton is due to loss of lock shouldn't you occupy it for the full 5 minutes ? If it's just a re-occupation for a second tie then you wouldn't change the number (xref it to the original number) and take your standard K observation.

Jimbo

PS. But don't say yes to handheld because it thinks you are on the init bar.

Jimbo,

Regardless if you are re-occupying a point due to loss of initialization or for a check of the previous observation (second tie), you need only observe for a short time period, i.e. 10 seconds or so. This is true for any initialization on a known point. Since the point position is already known with reference to the base point, initialization requires only a few seconds of observation time.

Bill Martin
Ashtech Precision Products

Thanks Bill.

After thinking about it I realized that was what I did. I was really thinking of reiniting on an unknown point where you really are getting a new static point in the middle of the K survey. And i go for three 5 minute periods with the same point no. to do it.

Jimbo

PS. Meet one of your associates at the LSPS Annual Convention in Baton Rouge, La. I've got his card with all the other stuff....Bob? from yall's DC office.

Just yesterday I used my kinematic kit for the 3rd time since Nov. 99. Just seem to never get the wide open jobs here in MS.
Used my previously resolved static points, one receiver was set up as the base, another as base #2 with the bar. Initialized on the bar, and then took off with the third receiver as the rover on the 2 meter pole. Read 3 epochs at 5 seconds each on each point, only lost lock 3 times in two sessions of about 3 hours each. Most of the day I had 5-6 sv's blinking green, the PDOP from the almanac was below 4 most of the time.
Processed and left out the base-base vector in the adjustment. Chi square passed at about 0.98xxxxx at the 95% level. Using custom grid from base grid conversion of SPC.
Got to feeling pretty comfortable with the kinematic shots, set a few nails as "reinitialization points" as I went down the road. Then I got brave. After setting and observing on a nail, I would flip the pole over, let it lose lock, then set it up right again and wait for the alarm to quit after 2 minutes. Then I would reobserve on the same nail as to re initialize, and go on my way. Hit all the nails at least twice, and about an hour or so in between.
The processing shows the nails that were observed more than once to have a much better solution than the topo shots that were done only once. So I think something can be said for the redundency.
Checked a few of them today with the Topcon GTS-602, and found the difference to be about 0.02' N and E and about 0.06' in elevation. I won't complain about that, especially after only using 15 seconds of data to get the result.
Couldn't have done it easier without the articles that Bill Martin gave us a while back on grid to ground and kinematic observations, along with all you other guys that contribute to this message board. A big THANKS is in order to all you guys.
Dave