Knowledgebase
Multiset Records in a FieldGenius Raw File
Posted by James Johnston on 31 March 2016 03:56 PM
  • When the multiset routine is run in FieldGenius, the user can observe the backsight and foresight as many times as required.
  • FieldGenius can tell if the measurement is face right or face left by checking the vertical angle (0 to 180 = right, 180 to 360 = left)
  • The user is presented with a dialog summarizing all observations
  • The user can reject some observations if required
  • The results are stored in the raw file as a TR or SS record
  • A short summary of how FieldGenius computes the traverse once "Store Point" is picked from the multiset routine:
  1. Backsight observations are averaged and stored as a "BC" record
  2. Foresight observations are averaged
  3. A TR or SS record is written which records the averaged foresight plate reading is stored as an "AR" record
  4. The computed direction to the foresight point is based on the angle between the averaged backsights and the averaged foresights.

Let's look at an Example:

OC,OP1,N 100.0000,E 100.0000,EL100.0000,--
BK,OP1,BP2,BS356.25515,BC45.00300
BR,OP1,BP2,AR45.00300,ZE90.00000,SD117.6302
RB,OP1,BP2,AR45.00000,ZE90.00000,SD117.6304,HR0.000,--
RB,OP1,BP2,AR225.01000,ZE270.00000,SD117.6300,HR0.000,--
RF,OP1,FP3,AR135.00000,ZE90.00000,SD100.0000,HR0.000,--
RF,OP1,FP3,AR315.01000,ZE270.00000,SD100.0000,HR0.000,--
SS,OP1,FP3,AR135.00300,ZE90.00000,SD100.0000,--



Transit @ 1, Backsighting 2, Foresighting 3


THE BACKSIGHT:

OC,OP1,N 100.0000,E 100.0000,EL100.0000,--
BK,OP1,BP2,BS356.25515,BC45.00300

--Averaged BS plate reading (Face Right)(computed from RB lines below) : 45-00-30.0

BR,OP1,BP2,AR45.00300,ZE90.00000,SD117.6302

--BR record just provides additional info

RB,OP1,BP2,AR45.00000,ZE90.00000,SD117.6304,HR0.000,--
RB,OP1,BP2,AR225.01000,ZE270.00000,SD117.6300,HR0.000,--


THE FORESIGHT:

RF,OP1,FP3,AR135.00000,ZE90.00000,SD100.0000,HR0.000,--
RF,OP1,FP3,AR315.01000,ZE270.00000,SD100.0000,HR0.000,--

SS,OP1,FP3,AR135.00300,ZE90.00000,SD100.0000,--
--Averaged FS Plate reading (Face right) 135-00-30.0


Now we compute the angle to 3:

Average foresight plate reading: 135-00-30.0 
- Average Backsight plate reading: 45-00-30.0
= 90-00-00 ...the final angle

The final angle will be applied to the computed direction to the backsight to compute the final direction to the foresight.

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