xv
foreword
As children, we were all told at one time or another that “we are what we eat,” as a
reminder that our diet is integral to our health and quality of life. In the modern
world, with location-aware smartphones in our pockets,
GPS units in our vehicles, and
the internet addresses of our computers geocoded, it has also become true that “who
we are is where we are”—every individual is now a mobile sensor, generating a cease-
less flow of location-encoded data as they move about the planet.
To manage and tame that flow of data, and the parallel flow of data opened up by
economical satellite imaging and crowd-sourced mapping, we need tools equal to the
task—tools that can persistently store the data, efficiently access it, and powerfully
analyze it. We need spatial databases, like
PostGIS.
Prior to the advent of spatial databases, computer analysis of location and map-
ping data was done with geographic information systems
(GIS) running on desktop
workstations. When it was first released in 2001, the project name was just a simple
play on words—naturally a spatial extension of the PostgreSQL database would be
named
PostGIS.
But the name has come to have further significance as the project has matured.
Each year, new functions have been added for data analysis, and each year users
have pressed those functions further and further, doing the kinds of work that in ear-
lier years would have required a specialized
GIS workstation. PostGIS is actually creat-
ing a world that is post-GIS—we don’t need GIS software to do GIS work anymore; a
spatial database suffices.
Licensed to tracy moore <nordick.an@gmail.com>
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