Map-matching.md

 Map matching is a process used in navigation and transportation systems to determine the location of a vehicle or a person on a map based on sensor data. It is typically used to align the position and movement of a vehicle or person with a digital map, allowing for more accurate navigation and tracking.
 
-Map matching typically involves comparing the sensor data, such as GPS or inertial sensor data, with the digital map data. The sensor data is typically in the form of a series of GPS coordinates or inertial measurements, while the digital map data is typically in the form of a vector map, which represents the roads and other features in a geographical area.
+Map matching typically involves comparing the sensor data, such as GNSS or inertial sensor data, with the digital map data. The sensor data is typically in the form of a series of GNSS coordinates or inertial measurements, while the digital map data is typically in the form of a vector map, which represents the roads and other features in a geographical area.
 
 **The process of map matching involves several steps:**
 **-   Data pre-processing:** This step involves cleaning and preparing the sensor data and digital map data for the map matching process.