I am trying to understand the concept behind the Spatial Reference System, Why is it used and what is so specific about the number. I went through many definations and almost all went over my head. So Could any one help me understand what is SRID, and its importance in GIS.
I thought, it was a reference to draw maps from a real world place, expressed in map. But then I inserted a point in PostGIS, with SRID 300 and then inserted the same point with SRID 350, I found the two points showing the same place, in QGIS viewer. I am totally confused.