PLSS - PUBLIC LAND SURVEY SYSTEM - PLSS 37 Initial Points...

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Unformatted text preview: PUBLIC LAND SURVEY SYSTEM - PLSS 37 Initial Points (5 in Alaska) - Tallahassee IP adopted in 1824 Lat/Lon/Azimuth measured B a s e lin e PM 1 st S td P a ra lle l N 1 st S td P a r a lle l S Measuring Lines of Latitude Solar Method Astro North then 90deg turned (every 40 ch) Tangent Method Right angle tangent then offsets computed (Fig 22.4) Secant Method Right angle tangent passes through 1 and 5 mi points (Fig. 22.5) 24 mi 24 mi G u i d e M e r i d i a n 24 mi 2 80 40 ch A s t r o n o m i c N o r t h 120 160 200 240 280 320 360 400 440 480 4 6.5 9 12.5 16.5 20.5 25.5 31 37 Offsets in Links D is ta n c e in C h a in s o n T a n g e n t 36 35 34 33 32 31 Sections A s t r o n o m i c N o r t h 80 40 ch A s t r o n o m i c N o r t h 120 160 200 240 280 320 360 400 440 480 36 35 34 33 32 31 Sections A s t r o n o m i c N o r t h Tangent Method Secant Method 2 4 m i l e s A B C D E F G H I 24 miles CC CC CC CC 24 miles Base Line or Std Parallel P r i n c i p a l o r G u i d e M e r i d i a n 2 ch 1 ch If Misclosure < 3 ch (X or Y direction) accept Correct random line as shown Deficiency or Excess placed in last mile North and last 1/2 mile West...
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PLSS - PUBLIC LAND SURVEY SYSTEM - PLSS 37 Initial Points...

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