Do Surfer viewsheds account for the curvature of the earth? Follow The viewshed layers in Surfer currently do not account for the curvature of the Earth. If you would like this feature, please contact firstname.lastname@example.org. Updated October 22, 2018 Related articles What is a Surfer viewshed? How can I create a viewshed in Surfer? How do I add an attribute (like ZLEVEL) to all objects in my Surfer base layer at once? How can I add lat/long graticule lines to my Surfer map? Comments 0 comments Please sign in to leave a comment.