Application of RTK CONMAV 2-frequency GPS in developing control networks for building catalog maps in Hai Ba commune, Hai Lang district, Quang Tri province

Abstract

To establish a control grid for mapping cadastral charts using 2-frequency RTK Comnav GPS technology in the Hai Ba commune, Hai Lang district, Quang Tri province, we utilized relevant data and documentation combined with surveying the control grid using the RTK Comnav device. By 2021, we had established 20 first and second-class control points and produced 36 cadastral charts at a scale of 1:2,000 at the Hai Ba commune. The cadastral control grid in the Hai Ba commune was created from 14 pairs of surveying and mapping control points. The results of the error analysis for the control grid are as follows: the root mean square error of a single unit weight is ±1 m; the maximum positional error is 0.008 m (point K3), and the minimum positional error is 0.005 m (point K13). The relative root mean square errors for length and azimuth are 1/825,875–1/21,564 and 0.17–9.87", respectively. The root mean square error of the height difference fluctuates within the range of 0.007–0.032 m. All these errors fall within the permissible limits according to Circular 25/2014/TT-BTNMT of the Ministry of Natural Resources and Environment. We also proposed some solutions to enhance the effectiveness of utilizing RTK Comnav technology in surveying and mapping control networks in Quang Tri province.