Case Study | Underground Pipeline Exploration and Positioning with GN309
Aug 07,2025
ESPAC survey demonstration in Guangzhou urban area
Location: Guangzhou
Task: Identify the location of the sewage culvert
Date: May 13, 2025
Weather: Sunny
Equipment: GN309
Parameters: 30 GN309s were used to operate in the designated area, requiring a depth of 10m.
Based on the on-site conditions, a grid array with a point and line spacing of 1m was used, and the acquisition time was 20 minutes.
Field Picture
Data processing results
The overall dispersion of the ESPAC survey line is good. In the figure, a low-velocity anomaly, representing a low-density area, exists within a range of 3-5 meters horizontally and 7-8 meters vertically from the survey line endpoint. By adjusting the contour display range, a 2x1x1 cavity can be visually identified in this area. Based on known data, this anomaly is inferred to be the location of an underground sewage culvert requiring exploration.
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