https://community.esri.com/t5/arcgis-pro-questions/3d-polygons-for-landform-reconstruction/m-p/1315461#M71751 <P>Hello,&nbsp;</P><P>I have a DTM of a glacier and it's surrounding terrain and I'm trying to reconstruct the past glacier volume and size. Is there a way I can create a 3D polygon that sits flush to the bottom of the glacier (the DTM) and slopes so I can use it to estimate mass and volume loss?&nbsp;</P><P>I'm new to the 3D side of things with ArcPro and was wondering if this could be done?</P><P>Here's a terrible diagram showing what I am trying to get at...</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="GrahamDriver_1-1691147439358.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/77288i0EFC62B1861E559C/image-size/medium?v=v2&amp;px=400" role="button" title="GrahamDriver_1-1691147439358.png" alt="GrahamDriver_1-1691147439358.png" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">GrahamDriver_1-1691147439358.png</span></span></P><P>&nbsp;</P><P>&nbsp;</P> Fri, 04 Aug 2023 11:13:00 GMT GrahamDriver 2023-08-04T11:13:00Z https://community.esri.com/t5/arcgis-pro-questions/3d-polygons-for-landform-reconstruction/m-p/1315461#M71751 <P>Hello,&nbsp;</P><P>I have a DTM of a glacier and it's surrounding terrain and I'm trying to reconstruct the past glacier volume and size. Is there a way I can create a 3D polygon that sits flush to the bottom of the glacier (the DTM) and slopes so I can use it to estimate mass and volume loss?&nbsp;</P><P>I'm new to the 3D side of things with ArcPro and was wondering if this could be done?</P><P>Here's a terrible diagram showing what I am trying to get at...</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="GrahamDriver_1-1691147439358.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/77288i0EFC62B1861E559C/image-size/medium?v=v2&amp;px=400" role="button" title="GrahamDriver_1-1691147439358.png" alt="GrahamDriver_1-1691147439358.png" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">GrahamDriver_1-1691147439358.png</span></span></P><P>&nbsp;</P><P>&nbsp;</P> Fri, 04 Aug 2023 11:13:00 GMT https://community.esri.com/t5/arcgis-pro-questions/3d-polygons-for-landform-reconstruction/m-p/1315461#M71751 GrahamDriver 2023-08-04T11:13:00Z https://community.esri.com/t5/arcgis-pro-questions/3d-polygons-for-landform-reconstruction/m-p/1316087#M71817 <P>Hey Graham I would recommend checking the <A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/3d-analyst/an-overview-of-the-area-and-volume-toolset.htm" target="_self">following page</A> as it lists some useful geoprocessing tools that could be used for this workflow.</P><P>&nbsp;</P><P>I think drawing a large polygon over your DTM layer, assigning a Z value to this so that it sits ontop then running the Surface Volume tool should achieve this.</P><P>&nbsp;</P><P>Hope that helps!</P><P>David</P> Mon, 07 Aug 2023 16:20:13 GMT https://community.esri.com/t5/arcgis-pro-questions/3d-polygons-for-landform-reconstruction/m-p/1316087#M71817 David_McRitchie 2023-08-07T16:20:13Z