# px     py   pz   DEMFileName 
# Strip DEM - [px py pz] =Coordinates aligned with the reference DEM (reference in bundle adjustment). 
        0.00        -0.82         0.33  /home/chunlidai/blue/data/ArcticDEMdata/arcticdem_34_alaska_north//WV01_20160414_102001004F676500_102001004D204700_2m_lsf_seg1_meta.txt 
        0.00         0.82        -0.33  /home/chunlidai/blue/data/ArcticDEMdata/arcticdem_34_alaska_north//WV01_20190403_10200100810C6400_10200100857C5C00_2m_lsf_seg1_meta.txt