Discussion
The image co-ordinate system starts at .................. .
Answer: C
The image co-ordinate system starts at the top left corner.
A digital image is a grid of pixels stored row by row, as it is scanned or displayed. Its co-ordinate origin (row 0 or 1, column 0 or 1) is therefore the upper left pixel; column numbers increase to the right and row numbers increase downwards.
This differs from the usual map or Cartesian convention, in which the origin is at the bottom left and y increases upwards, which is why the bottom left option is the common mistake. Georeferencing has to account for that flipped row axis.
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