Contours feet & meters

[Zeke]

I have data in Michigan GeoRef meters coordinate system. I've added a point layer that also has a depth attribute field. The depth, however, is in feet, not meters. I want to add contour lines every ten feet. I've interpolated the data to a raster, where the values match the depth, but I'm guessing being treated as meters instead of feet (ex. value -1000 interpreted as -1000 meters, not feet).
I then try Surface Analysis - Contours, but not sure what to put as the contour value and the z-factor. I've tried 3.2808 & .3048 in different combinations, but not sure if that's correct, and whether it gives correct data in 10 foot intervals. Any ideas? Thanks.

[AndrewDunn]

The coordinate system that your data is in and the vertical units of your Z value have no relation to each other if I am reading your post correctly.

The spatial element of your data is XY in meters but your z value is in feet, when you created the raster and contours the z value of both should still be the same as the original input data i.e. feet. If you want your z values to now be in meters you need to apply a factor to the data sets you want to convert, use the z factor option for the contours and you could use the raster calculator to multiply your raster by a constant value to get it into meters.

[Zeke]

Thanks, that makes it much easier. I was assuming that since the coordinate system was meters, the z values would be treated as meters as well. Your answer is very helpful.