https://community.esri.com/t5/arcgis-pro-questions/classify-las-by-height-3d-analyst-tool/m-p/1171977#M54918 <P><a href="https://community.esri.com/t5/user/viewprofilepage/user-id/14520">@KenBates1</a>,&nbsp;<A href="https://pro.arcgis.com/en/pro-app/2.8/tool-reference/3d-analyst/classify-las-by-height.htm" target="_self"><EM>Classify LAS By Height (3D Analyst)</EM></A> will use a&nbsp;<EM>value table</EM> (and not another secondary reference TIN or DEM) to classify the input LAS Dataset's existing/native height values, though one can select a&nbsp;<EM>Processing Boundary</EM> polygon layer to further define the extent of points that will be classified in the tool.</P> Mon, 09 May 2022 14:31:28 GMT ThomasHamill 2022-05-09T14:31:28Z https://community.esri.com/t5/arcgis-pro-questions/classify-las-by-height-3d-analyst-tool/m-p/1171528#M54844 <P>Does anyone know if the Classify LAS by Height (3d Analyst) tool compute height from a reference surface and if so is it a TIN or DEM?</P> Fri, 06 May 2022 16:03:49 GMT https://community.esri.com/t5/arcgis-pro-questions/classify-las-by-height-3d-analyst-tool/m-p/1171528#M54844 KenBates1 2022-05-06T16:03:49Z https://community.esri.com/t5/arcgis-pro-questions/classify-las-by-height-3d-analyst-tool/m-p/1171977#M54918 <P><a href="https://community.esri.com/t5/user/viewprofilepage/user-id/14520">@KenBates1</a>,&nbsp;<A href="https://pro.arcgis.com/en/pro-app/2.8/tool-reference/3d-analyst/classify-las-by-height.htm" target="_self"><EM>Classify LAS By Height (3D Analyst)</EM></A> will use a&nbsp;<EM>value table</EM> (and not another secondary reference TIN or DEM) to classify the input LAS Dataset's existing/native height values, though one can select a&nbsp;<EM>Processing Boundary</EM> polygon layer to further define the extent of points that will be classified in the tool.</P> Mon, 09 May 2022 14:31:28 GMT https://community.esri.com/t5/arcgis-pro-questions/classify-las-by-height-3d-analyst-tool/m-p/1171977#M54918 ThomasHamill 2022-05-09T14:31:28Z