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Did not find that function when I post it. I tried it and it works great.
Still, adding an appendix for drawing simple geometries would be interesting ^_^
Hi Regina,
Could you add an extra chapter in PART I - Learning PostGIS about how to draw some special (but frequently used) shapes?
I am looking for "circle sector" in particular. I can use polygon to approximate one at present. And I cannot use the curved polygon as I need to use st_contains, st_intersects functions.
We are looking for spatial solutions to postgreSQL. But we find that PostGIS is on GPL license, which might cause some problem for commercial use.

And then we find that pgSphere supports the basic functions we are interested and it is on BSD license.

So here comes the questions: is pgSphere a simplified version of PostGIS regarding to functionality?

Thanks for anyone who can offer help ^_^
Thank you very much for your comprehensive explanation. It is definitely a good news for us to know that PostGIS is available for commercial use.
BTW, the book is a very good reference for PostGIS