This document contains a table with data on cross-sectional measurements of a roadway, including station locations, left (L), center (CL), and right (R) measurements of the road width, and elevation levels. The table includes station locations from 0+000 to 0+400 meters in 20 meter increments, with width measurements for each location and benchmark (BM) and point (PT) locations noted.
This document contains a table with data on cross-sectional measurements of a roadway, including station locations, left (L), center (CL), and right (R) measurements of the road width, and elevation levels. The table includes station locations from 0+000 to 0+400 meters in 20 meter increments, with width measurements for each location and benchmark (BM) and point (PT) locations noted.
The document provides information about leveling and the leveling process. It defines key leveling terms and describes differential leveling and the height of collimation and rise and fall methods. It also outlines the leveling apparatus, including the automatic level, tripod, leveling rod, and other components. The objective is to determine elevations of unknown points relative to known elevations through precise leveling measurements and calculations.
This document describes a two-peg test method for checking and calibrating the accuracy of a level or transit instrument. The method involves sighting the instrument midway between two rod positions (A and B) that are approximately 30 meters apart. Elevation readings are taken at positions A and B and compared to check for any error. If an error exists, the instrument can be adjusted using screws or menus until the expected reading is obtained to calibrate the instrument.
1. The document contains a table of station (STA), angle, correction, and log sine values.
2. Angles are adjusted in two steps using correction values to calculate adjusted degrees, minutes, and seconds.
3. Log sine values are calculated and compared at each adjustment step to check calculations.
21. Figure 6.6 (p. 111) DiNi total level station, which has electronic sensor for reading a bar code to determine elevations. (t can also be used for distance and angle measurement. (Courtesy of Carl Zeiss, Inc.) Slide โดย อ . ดร . ชาติชาย ไวยสุระสิงห์
72. (1) (2) Slide โดย อ . ดร . ชาติชาย ไวยสุระสิงห์ STA BS HI FS Elevation (1) A 0.875 10.875 10.000 B 1.495 9.380 (2) A 1.805 11.805 B 1.259 10.456 Elev_B Mean (9.380+10.456)/2 = 9.963 A B
106. ตัวอย่างที่ 4 Slide โดย อ . ดร . ชาติชาย ไวยสุระสิงห์ a = 30 o 22’00” Elev A = 361.297 m S = 82.181 m 2 m Elev B = ? m A B hi = 1.578 m r = 2 m a = 30 o 22’00” V = S Sin a V = 82.181 Sin (- 30 o 22’00) m = - 45.199 m 1.578 m Elev B = Elev A + hi + V – r Elev B = 361.297+1.578 – 45.199 – 2 m Elev B = 315.676 m
108. Reciprocal Trigonometric Leveling งานระดับตรีโกณมิติแบบสอบกลับ ( ต่อ ) Slide โดย อ . ดร . ชาติชาย ไวยสุระสิงห์ h A h B A C B D S AB a b r r c/2 c/2 90+c/2 c