Chapter 3. Spatial reference system considerations

This chapter covers:

Characteristics of spatial reference systems

How to determine and select spatial reference systems

Up to this point we’ve been working mostly with fictitious data. Using sample data to learn the basics of PostGIS is an excellent beginning. You’re immediately rewarded with results without facing the distractions and the obstacles of real-world data. From this chapter forward, though, we’re not going to shield you anymore.

We’ll start this chapter by discussing different types of spatial reference systems. We’ll then follow up with sections on selecting suitable SRSs for storage and on determining the spatial reference of source data.

The art and science of modeling our bulbous ...

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