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How to make one surface take precedence over another

Question asked by Kaden Dauter on Oct 25, 2019
Latest reply on Nov 7, 2019 by Kaden Dauter

Im trying to create a combined, existing grade surface in order to model a design layer on top and get corresponding cut/fill and mass haul maps. I have a LIDAR file from a year ago, as well as a survey that covers any changes in the area over the past year due to mining. My questions is; how to I combine these two surfaces, in a way that ensures the survey (surface shown in white on the image) takes precedence over the LIDAR (surface shown in red) wherever it may be present? I still need the LIDAR on the rest of the project, where the survey does not cover (shouldn't have changed in the past year). When I attempt to simply combine the surfaces into a compound surface, the elevation at each point is just wherever is highest between the two.

 

Any help would be greatly appreciated,

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