Profile for setting Control - Photo Control

[James Suttles]

Any ideas on profile settings for setting ground control, mainly low level Aerial and Lidar Control? Would you need to use boundary with verify for this level of accuracy, or more stringent? Or is the best way to use static method.

I have used static method for years, but a 2 hour OPUS solution, is quickly becoming ineffective.

Thx

 

[Nate The Surveyor]

It sort of depends on the SPECS of your or your clients needs.
I'd suggest maybe to make 2 trips AROUND all the photo control. This would put a TIME separation between each shot, and use boundary profile. A time separation will add about as much as you can do, to make the 2 shots differ, (especially in elev.) I sort of think it would be quite revealing. Also, WATCH your "Shot spread" ie, how much the horiz and vert graph shows it moving around. A shot with a LARGE vert or horiz shot, should be paid special attention. Don't forget to index and measure your HI at base and rover, carefully!
(Just my thoughts).
Nate

 

[StLSurveyor]

I use the boundary profile and take two separate shots as Nate described and use the on-board average feature. This method provides control that is accurate enough for our Leica P40 scanner (which will reject anything over 0.05). I have also tested the control with a TS. The error I typically see when using our TS to verify the control is 0.02+- You will be fine for any aerial work. Just be smart about your point placement. R

 

[Sean Joyce]

Put your control specs and measured points into the awesome Relative Accuracy Tool and generate a report.