What is the difference between raster and vector data?

Raster and vector are two very different but common data formats used to store geospatial data.
Vector data use X and Y coordinates to define the locations of points, lines, and areas (polygons) that correspond to map features such as fire hydrants, trails, and parcels. As such, vector data tend to define centers and edges of features.
Raster data, on the other hand, use a matrix of square areas to define where features are located. These squares, also called pixels, …

What is a road centerline?

Road centerlines are vector line data that represent the geographic center of road rights-of-way on transportation networks. Road centerlines can be developed through a variety of techniques, including GPS data collection and digitization of roads on aerial photographs. Road centerlines can be used to encode road characteristics, including road name, road width, pavement type/conditions, number of travel lanes, travel directions, bridge weight limits, address ranges, speed limit, etc.
The extensive attribute data stored with road centerlines facilitate their use in …