I have about 20 shapefiles that contain contours lines, and I'm trying to convert them to one TIN using Spatial Analyst in ArcGIS 9.3. I included all of the SHP's as input to generate a TIN, but it didn't work. I have tried with hard line, soft line, and mass points options, but nothing is working.
I think if I first created a single contour shapefile from the 20 then I would be able to generate a TIN. My question is: how can I create 1 contour layer from the original 20, or how can I create one TIN from multiple shapefiles?