I'm doing a 2D hydraulic flood study of rivers in a 63 km2 basin. I have a RASTER of the topography (1x1 meters) that I have passed to TIN using ARCMAP. Giving a z=0.3 meters, I get a TIN network with too many triangles in areas where I do not require so much density. I am only interested in a high density close to rivers. Is it possible to edit, collapse, decrease the density of the TIN mesh using a feature such as a polygon?



The short answer is Yes, but creating and editing a TIN surface is beyond the scope of this forum, you need to be training yourself if you are asking such questions. As you have tagged this as an ArcMap question I suggest you head over to esri training and complete the Creating 3D Data using ArcGIS course.

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