Just built a model that uses 3D Analyst - Surface Volume. I am trying to use a z factor of 1. Whenever I run the model my output table shows that a Z factor of 0.999998 was used instead of 1. I know this is a very small difference but even so, it is skewing my results somewhat. Really what I would like to know, is there a good explanation of why it gets changed to 0.999998 or is there a way to make it stay at 1?
Thanks again for your input. When I've tried changing the type of raster, the tool grays out the z factor all together and locks it in at 0.999998. So... I'm guessing there is really no way around this using integer or floating point data. I even tried converting to integer and using the raster calculator to multiply the data by 1000 to preserve the decimals in integer form, but was still stuck with the 0.999998 z factor. No dice.