Try drawing a lake two different ways. First, trace its exact shoreline with a pencil, one continuous line. Second, colour in every little square of graph paper the lake touches. Same lake, two totally different results, and GIS actually uses both methods, depending on the job.

These are vector and raster, the two fundamental ways any GIS stores the shape of the world.

Build Both Yourself

Switch between the two modes below. In raster mode, click cells to "paint" a shape from the grid. In vector mode, watch how the same shape only needs a handful of coordinate points to describe it exactly.

Notice the difference in what actually gets stored. The raster grid needs a value for every cell in that image, dozens of numbers just for one small lake. The vector version needs only seven coordinate points, plus the fact that they connect in order. That's the core reason vector files are usually smaller and more precise.

Where Each One Wins

Vector shines wherever exact boundaries matter, a land parcel edge, a pipeline route, a road centreline. Raster shines wherever the data is naturally continuous, like elevation or temperature, values that exist everywhere without hard edges. This is exactly why a drone-captured orthomosaic is raster data, it's a seamless grid of pixels, not a set of drawn boundaries.

The Hidden Cost of Converting Between Them

Most captured survey data starts as vector, digitized boundaries, GPS points, drawn lines. When that data needs to feed a raster-based analysis, like a flood model, it has to be converted, and that conversion always loses something. Pick too coarse a cell size and fine detail vanishes. Pick too fine a cell size and file sizes explode. Getting that balance right is a judgment call, not a default setting.

Vector remembers exact edges. Raster remembers every square inch equally.

On real projects, this decision happens before a single map gets drawn. A boundary survey destined for legal land records stays vector, full precision preserved. A terrain model destined for flood analysis becomes raster, because that's what the GIS solutions workflow needs for continuous surface modelling.

Next time you're in any mapping software, check the layer type before trusting the detail level. A raster layer zoomed in too far starts showing its squares. A vector layer stays crisp no matter how close you get, that's the tell.