Finding specific points in UIView

Hey. I'm building an iPad app and I need to mark specific points on top of a map (UIImageView). I have the coordinates in inches, but I'm having trouble mapping 开发者_运维问答the inch-based coords to iOS points, I've googled for hours and nothing too conclusive.

Any ideas?

Thank you.

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So you have actual units and want to convert those to points?

The iPad screen has a 9.7" diagonal. In points, it's 1024x768. So, applying Pythagoras, that's 1280 points on the diagonal. Therefore the points per inch is very close to 132, which I've also seen given elsewhere without computation from first principles.

So, a distance of x inches is x * 132 points. E.g. 1.5" is 198 points.