Vector vs Raster Data - GIS Explained 

In the subject of Geographic Information Systems (GIS), the vector and raster formats are two ways of representing real-world phenomena on a digital map. The vector format relies on shapes with precise vertices, while the raster format consists of a grid made up of cells. Each has their advantages and disadvantages. There is a saying that goes, "Raster is vaster, but vector is corrector."
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