# Tag Info

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3D Analyst tools >> Data management >> TIN >> create TIN

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Sounds like you may have reached the "Maximum Number of Points" limit. By default this number is set to 1500000 but you can increase it. (it is an option in the Raster to TIN) dialog

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If the result you get from @blah238 correct answer is not acceptable (in my case I can never achieve perfect results using this tool as it is based on triangle edge length) you can digitize a polygon delineating the desired outer extent manually. Once complete re-create the TIN and add the polygon to the input list (last in hierarchy) and set the SF_Type to ...

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You could drape your geological polygons on the elevation surface you created to make them 3D. Two ways in 3D Analyst are Interpolate Shape and Add Surface Information. For an explanation of both see: http://resources.arcgis.com/en/help/main/10.1/index.html#//00q80000005m000000

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I think you are looking for the Delineate TIN Data Area tool: Redefines the data area, or interpolation zone, of a triangulated irregular network (TIN) based on its triangle edge length.

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Use the TIN Edge tool (I'm assuming you have 3D Analyst) to extract the triangles as features. Delete the erroneous triangles and then dissolve to get a bounding polygon of the valid elevation values of your surface. Then regenerate your TIN, incorporating that polygon as an exterior boundary.

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z factor is used for the conversion between Z unit and XY unit. So if your coordiante system is in meter and your height too, z factor is 1. (it would be different if you have feet and meters, or degrees and meter etc) For the plane height, all volume above (or below) this height will be measured. So in your case you will use 25 m

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All you need is your (clipped) TIN. You do not need a polygon (or contour lines). You have to execute Surface Volume (3D Analyst) tool several times. Use Surface Volume (3D Analyst) with reference_plane = above and base_z = 25. You get the volume above 25 meter. Run tool again with base_z = 35. You get the volume above 35 meter. Run tool again with base_z ...

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If you want to calculate the volume above or below a given reference plane you do not have to create a reference plane data set. The reference plane is just the elevation (e.g. 250 meters) of the plane. In Surface Volume (3D Analyst) tool you have to specify this height as base_z parameter. EDIT: If you really want to create a reference plane data set you ...

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Firstly you need to understand that contours are not painted on the ground, they are a model. Secondly a TIN and a DEM are also models. With that in mind debating the relative inaccuracies of models of a model seems a little pointless. When creating a contour from a TIN the process must internally convert to a raster or the only vertices created will be on ...

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I have another question, actually after import 3D dxf file , it doesn't have any Z attribute . thanks for your help in advance.

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