2485 Rate this article: No rating How does the DEM Extraction module calculate post spacing? If I have a QuickBird image at 4m spatial resolution and compute a level 6 DEM, what would the "post spacing" be relative to the resolution? Post spacing (the DEM posts obtained during the matching process) may be estimated based on the following formula: post_spacing = 2^(N-L) * GS * RF where: N is the highest terrain detail level L is the terrain detail level that user selects GS is the input stereopair image resolution RF is the epipolar reduction factor So if level 6 is the highest terrain detail available and you set the epipolar reduction factor to 1, then post spacing will be 4m, regardless of the output DEM pixel size. Review on 12/31/2013 MM Please login or register to post comments. Mouse events on Mac OS X 10.4 Tiger High Level Description of the BandMax Algorithm