topic Failed DEM from LiDAR in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/failed-dem-from-lidar/m-p/297639#M4200 <HTML><HEAD></HEAD><BODY><P>I created a DEM using a multipoint file that was derived from a .LAS file. The DEM did not use a large portion of the points and does not encompass the entirety of the study area. Several million points were excluded when creating the DEM using IDW. I ran the IDW a second time and, while the second DEM included more of the points, there was still a large amount of points excluded. For reference, I set the cell size to 1cm using the closest 100 points so there should be plenty of information to generate a larger DEM including the excluded points. Has anyone run into this problem before using .LAS data or know of any way to fix this issue? The only thing I can think of is to set the extent to a boundary that covers all the points. I am worried this will that this will still exclude&nbsp;some of the points&nbsp;and the DEM will just be a shadow beyond what has already been created.</P></BODY></HTML> Mon, 25 Mar 2019 16:05:33 GMT MatthewNolasco 2019-03-25T16:05:33Z Failed DEM from LiDAR https://community.esri.com/t5/arcgis-spatial-analyst-questions/failed-dem-from-lidar/m-p/297639#M4200 <HTML><HEAD></HEAD><BODY><P>I created a DEM using a multipoint file that was derived from a .LAS file. The DEM did not use a large portion of the points and does not encompass the entirety of the study area. Several million points were excluded when creating the DEM using IDW. I ran the IDW a second time and, while the second DEM included more of the points, there was still a large amount of points excluded. For reference, I set the cell size to 1cm using the closest 100 points so there should be plenty of information to generate a larger DEM including the excluded points. Has anyone run into this problem before using .LAS data or know of any way to fix this issue? The only thing I can think of is to set the extent to a boundary that covers all the points. I am worried this will that this will still exclude&nbsp;some of the points&nbsp;and the DEM will just be a shadow beyond what has already been created.</P></BODY></HTML> Mon, 25 Mar 2019 16:05:33 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/failed-dem-from-lidar/m-p/297639#M4200 MatthewNolasco 2019-03-25T16:05:33Z Re: Failed DEM from LiDAR https://community.esri.com/t5/arcgis-spatial-analyst-questions/failed-dem-from-lidar/m-p/297640#M4201 <HTML><HEAD></HEAD><BODY><P>moving to <A href="https://community.esri.com/space/2091">Spatial Analyst</A>‌</P></BODY></HTML> Wed, 27 Mar 2019 01:27:09 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/failed-dem-from-lidar/m-p/297640#M4201 DanPatterson_Retired 2019-03-27T01:27:09Z