Project Ruler
The Project ruler is a geometric progression that defines resolution (UPP) sub-divisions. By default, TerraBuilder sets the UPP for a source file to the original UPP of the source. If the original UPP is not on a level of the ruler, TerraBuilder selects the next smaller (better resolution) value on the ruler. For MPU files, the UPP of each source file is set to the original UPP of the source, regardless of ruler settings and upsampled or downsampled when the MPT is created.