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i have a question regarding this tutorial:

http://www.gistutor.com/postgresqlpostgis/10-intermediate-postgresqlpostgis-tutorials/75-understanding-postgis-spatial-queries.html

As u see, it demonstrates how spatial sql statements are working. But my question is, how this tutorial with this webgis was built up.

I know that openlayers,json,php,wfs-t,ajax and postgis comes into the play but how all these componentes are working together. Is there any good tutorial out there or do somebody can gives workshops? thank you

regards ulan

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