what are the meaning of parameters in FMM configuration or STMATCH configuration?

[visile]

what is the meanings of k, gps_error, radius,vmax,factor?And what are the units of them?

[cyang-kth]

You can check the link here https://fmm-wiki.github.io/docs/documentation/configuration/

From the page:

About map unit. The unit of search radius and gps error, vmax are assumed to be the same as the road network shapefile. Both the network and gps data should be in the same reference system.

• If both the network and gps data are unprojected (in geodetic degree such as OSM and latitude, longitude), then 1 degree of latitude or longitude equals to about 111km. Search radius of 0.003 should be defined here to represent to 300 meters in reality.
• If both the network and gps data are projected in meters, Search radius of 300 corresponds to 300 meters in reality.

[visile]

thank you for you help!