FindMM (千寻见微)

FindMM (千寻见微) is a cloud-based static GNSS high-precision positioning service from Qianxun Spatial Intelligence, used for deformation monitoring of slopes, mines, power towers, buildings, dams, bridges and areas of regional subsidence in China. Monitoring a structure with GNSS normally means building reference stations and running specialist post-processing software. With FindMM, operators configure their GNSS receivers to stream raw observation data (RTCM 3.2, MSM4/MSM5) over Ntrip to Qianxun's gateway; the platform automatically selects nearby reference stations from Qianxun's BeiDou ground-based augmentation network and computes each monitoring station's coordinates, so customers do not need to buy solving software or build and maintain their own reference stations.

The default mode is post-processed millimetre-level solving over a 12-hour arc (configurable from 2 to 24 hours), producing one result per hour from BDS and GPS data; BeiDou, GPS, GLONASS and Galileo observations are accepted. For typhoon and flood seasons a real-time centimetre-level mode can be enabled, outputting up to one result per second. Results (WGS84 XYZ and BLH coordinates) are available in a web control centre with station maps, displacement curves and data-quality analysis, and through an Open API for integration into customers' own monitoring platforms. Qianxun specifies post-processed accuracy of 2.5 mm + 0.5 ppm horizontal and 5 mm + 0.5 ppm vertical, and real-time accuracy of 2 cm horizontal and 4 cm vertical, subject to site conditions and data quality. The service covers 33 provincial-level regions, some of them partially.

Qianxun cites deployments including mine slope monitoring by Inner Mongolia Guangna Coal Industry Group (horizontal accuracy 3 mm ± 0.5 ppm, vertical 5 mm ± 0.5 ppm), transmission-tower foundation monitoring with the China Electric Power Research Institute, and a monitoring system for dangerous housing built by Zheda Zhengcheng Technology.