PostGIS Raster : Extending PostgreSQL for The Support of ... - CoDE

Figure 4.17: Raster polygon representation [34].
sea level). Another example is temperature where the measure at each point is temperature at a place
on the Earth.
Figure 4.18: Raster elevation data for a part of the province of Quebec [8].
4.5 Spatial Resolution
The detail level of phenomena represented by a raster is often dependent on the spatial resolution
or cell size of the raster. The cell must be small enough to capture the required detaild but it has to
be also large enough so that computer storage and analysis can be performed efficiently. Smaller cell
sizes result in larger raster data set and greater storage space to represent an entire surface, which
often require longer processing time.
Figure 4.19: Spatial resolution.
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