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Is there a good tutorial that explains in depth the internals of a GIS and a spatial database system such as PostGIS with examples and without any background assumption? I'm specifically looking for answers to questions such as:

  1. What is a geometry in GIS?
  2. How is it represented?
  3. Given a lat/long coordinate, what are the operations I need to perform on it to bring it to a state where I can call something like ST_contain PostGIS to check if the polygon contains the lat/long coordinate?

I have some experience with general relational database systems but no background with GIS or the spatial database paradigm.

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up vote 12 down vote accepted

you could try they have a number of guides for PostGIS

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Thanks @Banger. I'm trying the tutorials now. – AnlKumr Dec 25 '12 at 22:54

While the PostGIS in Action book isn't a step by step tutorial, it is a very handy guide, and I recommend it to anyone who wants to truly understand PostGIS and get beyond just the basics of PostGIS.

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Perhaps the Intro to PostGIS would fit the bill,

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just crisscrossed this post. – Brad Nesom Dec 28 '12 at 21:31

Try the SpatiaLite Tutorial, it is very well done

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