In the past photographers had to stitch their photos manually in software like Hugin, PTGui ,Photoshop or Kolor Autopano Giga
from 3,4 or 6 rectangular images
now everything are fixet with the press of a button
But if you want high resolution the DSLR still counts
This screen cast are about stitching this way + Uploading the 98megapixel images to Google Street View
Note: the video has a little menu, hover over the bottom section to the right
Regards Svendus