Demystifying Video Sizes
I hope this chart will help you to understand the differences between the many video size standards available. NTSC is missing for some reason, but I suppose it could fall under the VGA (640×480) category. NTSC is 720×480 with a pixel aspect ratio of 0.9 giving it a video resolution of 648×480.
This chart demonstration the magnatude of standard definition footage to higher resolution footage.
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