NTSC is in fact an analogue video system.
It is unfortunately still called that in the digital world!
1920x1080 (Resolution) is a High Definition Digital format (HD-SDI) in which you can scan either interlaced or progressive. It is not NTSC video.
Standard Definition Digital formats (SD-SDI/DV) has various resolutions.
for frame rates at 23.98p 29.97i 29.97p the Resolutions available are 720x480, 720x480 Anamorphic, 720x486, 720x486 Anamorphic
for frame rates of 25 and 50 the Resolution available is 720x576.
What also differs with these formats is the pixel aspect ratios (they are NON Square)
Interlace scanning is on it's way out.
To create a project for 1920x1080 interlaced click on use custom settings

Then click and select 1080i HD and select your frame rate after that.
