TECHNICAL REPORTRESULTS the AVERAGE WRONG GRID LINE PASS level 2-ADVANCED TECHNIQUESI. Grid control using the supplied level 2I. 1. The chosen points, buried the mold On basis of technical requirements survey unit, choose the new landmark 05 and buried the level lines are numbered as follows: DC73A, DC74A, DC75A, DC79A, DC79B. The mold is poured in place with concrete, heart molds of porcelain and the size 20x20cm, 30x30cm bottoms high, 40 cm. Grids are designed to measure connection located at the premises, on the basis of level 2 class IV include: landmark GPS-GPS-05B, 05.I. 2. Measuring grid * Measurement: the unit using the total SET-e-510 with precision m = 05 ' '; Ms = 3 mm + 2pmm to measure the grid line 2 supply chain. Before measurement, the equipment has been tested and calibrated.* Processes and methods of measurement:+ Angle measurement: 3 measurement loops+ Measure edge: reversible 2-way (measure and measure about).+ The error of measurements: compliant with specification grid line 2 supply chain+ Trigonometric height.I. 3. Calculating the average error of the measuring results the metrics to measure the field is inserted into a computer to conduct the wrong bottle by the method of least squares. II. technical level GridII. 1. The chosen points, buried the mold The mold of grid control technical high mode is set to match the mold level pass, don't bury the private landmarks. the elevation Grid designed to map the appropriate class level IV, point taken as the point count.II. 2. Measuring grid * Measurement: use the B40 of SOKKIA Japan with Vx = 24 x and Mkm = 2 mm along a pair of sculptured surface 1 line 4 m aluminium mia.* Processes and methods of measurement: technical level Mesh is done according to the rules of 90-96 43 BC cartography Bureau (now the Directorate for cadastral).II. 3. Calculating the average error of the measuring results technical level Grid is calculated the average wrong according to the indirect method the wrong jar on the computer using the program setII. 4. system coordinates and altitude using: the flat coordinates, projection UTM Grid (national reference SG 2000), longitude 45 1050 axis ' projection time zone, 30State-level Systems HN1972 (The Dáu-Son-Hai Phong)III. conclusionGrid line pass level 2-high quality engineering coordinates and altitudes of good, qualified to perform the work of mapping the terrain offers a design drawing and layout construction.
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