Is it possible to merge 2 TIN layers or 2 DEM files into one. I need to create a surface to set base heights for building footprints to... Sorry, I am a novice at GIS, please let me know if there is a better method.
It's more advisable to merge rasters first and then generate a TIN. You can use Mosaic To New Raster (Data Management) to merge two DEM files into a new one.
