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Don Smith

Posted 12/29/2006 18:35 (#80210 - in reply to #80166)
Subject: Supporting evidence

Centre county Pennsylvania, USA

Static scatter tests (attached) for Trimble RTK and Trimble-WAAS DGPS show that RTK is defiantly needed to achieve elevation topo maps with 0.05 foot accuracy. However those same tests show that for machine attitude (slope) mapping, Trimble's WAAS DGPS provides same accuracy as Trimble RTK. Machine attitude (slope) is computed from 3D position fix 1st differences in both cases. Because machine GPS speed is also computed from position 3D 1st differences, speed accuracy is no better for Trimble RTK than it is for Trimble-WAAS DGPS. Actually, first differences are a form of RTK so test results are no big surprise. Because some lower quality receivers are both "noisy" and limited in 3D position fix resolution, not all WAAS DGPS receivers will provide same accuracy for machine attitude and speed.

(Trimble RTK scatter.jpg)

(Trimble-WAAS DGPS scatter.jpg)

(Trimble RTK 1st diff scatter.jpg)

(Trimble-WAAS DGPS 1st diff scatter.jpg)

Attachments
----------------

Trimble RTK scatter.jpg (25KB - 242 downloads)
Attachments

Trimble-WAAS DGPS scatter.jpg (35KB - 220 downloads)
Attachments

Trimble RTK 1st diff scatter.jpg (30KB - 236 downloads)
Attachments

Trimble-WAAS DGPS 1st diff scatter.jpg (38KB - 233 downloads)

GS2 - needing the ability to survey for drainage any compatible software out there. - green'lldo : 12/23/2006 19:32
- Re: GS2 - needing the ability to survey for drainage any compatible software out there. - Mbmaring : 12/23/2006 21:36
  - Re: GS2 - needing the ability to survey for drainage any compatible software out there. - green'lldo : 12/24/2006 01:49
    - Re: GS2 - needing the ability to survey for drainage any compatible software out there. - DRAW W8 : 12/24/2006 13:36
    - Re: GS2 - needing the ability to survey for drainage any compatible software out there. - Macy : 12/25/2006 17:45
      - Re: GS2 - needing the ability to survey for drainage any compatible software out there. - green'lldo : 12/25/2006 18:19
        
        FOViewer Link - Macy : 12/26/2006 21:54
        Re: GS2 - needing the ability to survey for drainage any compatible software out there. - mwilliams : 1/4/2007 20:00
  - Re: GS2 - needing the ability to survey for drainage any compatible software out there. - Don Smith : 12/25/2006 19:57
    - Re: GS2 - needing the ability to survey for drainage any compatible software out there. - Mbmaring : 12/25/2006 22:27
      - Re: GS2 - needing the ability to survey for drainage any compatible software out there. - Don Smith : 12/25/2006 23:46
- RTK only - Arnie : 12/25/2006 23:32
  - Check out this presentation on RTK mapping and ditching - DRAW W8 : 12/26/2006 01:16
    - RE: Check out this presentation on RTK mapping and ditching - Arnie : 12/26/2006 10:06
    - Re: GS2 - needing the ability to survey for drainage any compatible software out there. - Mbmaring : 12/26/2006 10:53
      - Re: GS2 - needing the ability to survey for drainage any compatible software out there. - Arnie : 12/26/2006 18:32
        
        Re: GS2 - needing the ability to survey for drainage any compatible software out there. - mwilliams : 12/29/2006 14:33
        
        Supporting evidence - Don Smith : 12/29/2006 18:35
        
        Re: GS2 - needing the ability to survey for drainage any compatible software out there. - bbouc : 1/4/2007 15:52
        
        Re: GS2 - needing the ability to survey for drainage any compatible software out there. - PRUST : 1/8/2007 12:23

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