Shapefiles doubts

[Apeksha Bhambhani]

Hiii all , 
   
  These are the few doubts that we have , could somebody please help us .
   
  1.While writing the mapfile , we need to specify the extent of the map . The background map chosen being in PNG image type , how do we get the extent of this image , so as to enter this data in the mapfile . 
   
  2.In interactive web-mapping , do we need MySql to store the data of the various points being plotted on the map or are the shapefiles sufficient . 
   
  3. We are working on an online project and when a new point needs to be plotted on the map and displayed , how can this data be entered into the shapefiles . We have read somewhere that Mapscripting can be used to convert textfiles to shapefiles . 
  Can you please direct us as to how can that be done ???
   
  4. We have got to know about this book "Web mapping illustrated - By Tyler Mitchell , O'reilly Publications " . Has anyone used used it for developing an online interactive web-mapping apllication (example editing of maps ).
   
  Thanks in advance ...................
   
  Regards 
  Apeksha

			
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