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Observation Point Height for Vewshed

Question asked by rralbritton on Sep 14, 2013
Latest reply on Sep 14, 2013 by rralbritton
I'm doing a viewshed analysis, using LiDAR data as my elevation dataset. My observation points are located on the top of buildings which range from 20-50 ft., but I need the observation points to have an elevation value below the top of the building (i.e @ 10 ft.). I can't set this using the SPOT field because SPOT requires values greater then the datasets elevation value. How to I get around this?