APPLYCATION OF GPS TECHNOLOGY TO SET UP CONTROL GRID FOR SPACE SURVEYING IN VAN LANG COMMUNE, YEN BINH DISTRICT, YEN BAI PROVINCE

Abstract

The results builT control grid in Van Lang Commune, Yen Binh District, Yen Bai Province as following: From 03 coordinate points (YB67, YB68, YB69) chosen as the starting point to further create 89 grid points with error criteria: mean square weighted deviation in units digit. mo = ± 1,000; Point positioning (maximum: (KV1-33): mp = 0,008m; minimum: (KV1-55): mp = 0,002m); Baseline mean relative error (maximum: (KV1-33---KV1-34): mS/S = 1/25.303; minimum: (KV1-39---YBI-68): mS/S = 1/447.797); Mean square error of azimuth edge (maximum: (KV1-33---KV1-34). ma = 8,39"; minimum: (KV1-39---YBI-68): ma = 0,46"); Elevation difference mean square error (maximum: (KV1-33---KV1-36): mh= 0,015m, minimum: (KV1-31---YBI-68): mh= 0,003m); Edge length (maximum: (KV1-1---KV1-5): Smax = 991,34m; minimum: (KV1-31---KV1-32): Smin = 106,87m; average: Saver = 464,61m). Thus, control grid for Van Lang commune, Yen Binh district, Yen Bai province ensures requirements in quality according to Circular No. 25\2014\TT-BTNMT dated 19/05/2014 of the Ministry of Resources and Environment, high accuracy, tight meshes and adequate conditions to set up a detailed cadastral map.