TECHNICAL REPORTRESULTS the AVERAGE WRONG GRID LINE level LINE-TECHNICAL LEVELI. grid control mode pass level 2I. 1. choose points, buried the mold On basis of technical requirements survey unit, choose the new landmark chain line 05 and buried the level 2 are numbered as follows: DC73A, DC74A, DC75A, DC79A, DC79B. The mold is poured in place by concrete company, landmark porcelain heart size 20x20cm, 30x30cm, bottom surface 40 cm high. Grids are designed to measure connection for ground coordinates, altitude based on the landmark class IV 02: GPS-GPS-05B, 05.I. 2. Measuring grid * Measuring equipment: the unit using the total electronic SET-510 with precision m = 5 ' '; Ms = 3 mm + 2pmm to measure the grid line level lines. Before the measurement, the equipment has been tested and calibrated.* Process and measuring methods:+ Angle measurement: measurement of round 3+ Measure edge: reversible 2-way (measured to go and measure about).+ The error of measurements: compliant with specification grid line level lines+ Trigonometric height.I. 3. calculate the average wrong measuring results the metrics to measure the field is put on computers to conduct the average wrong according to the method of smallest squared. II. technical level GridII. The work of selected points, buried the mold The mold of grid control mode of engineering is placed coincident level 2 pass landmarks, not buried private landmarks. the elevation Grid designed to map appropriate class level IV do score point counted.II. 2. Measuring grid * Measuring equipment: use the Japanese with SOKKIA's B40 Vx = 24 x and Mkm = 2 mm along a pair of line 1 engraving surface 4 m aluminium mia.* Process and measuring methods: technical level Grid is done according to the rules of 90-96 BC cartography Bureau (now the Directorate main Address).II. 3. calculate the average wrong measuring results technical level Grid is calculated the average wrong according to the method of indirect wrong on the computer using the program setII. 4. system coordinates and altitude using: the flat coordinates, projection UTM Grid (national reference VN 2000), Meridian axis projection time zone, 45 ' 30 1050the State-level Systems HN1972 (The Dáu-Son-Hai Phong)III. conclusionGrid line level line level high-quality technical coordinates and altitudes of good, qualified to perform the task of mapping the terrain serves construction drawing design and construction layout.
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