topic Im confused! Whats the difference between DEM and LIDAR data? in Data Management Questions https://community.esri.com/t5/data-management-questions/im-confused-whats-the-difference-between-dem-and/m-p/91097#M5350 <HTML><HEAD></HEAD><BODY><SPAN>Help! Can some explain the difference between these two types of data to me?</SPAN><BR /><BR /><SPAN>Which is best for using the Hydrology tools in spatial analyst?</SPAN><BR /><BR /><SPAN>I also want to be able to the slope function to calculate the slope the banks of rivers of streams.</SPAN><BR /><BR /><SPAN>What type of resolution DEM or LIDAR would i need to be able to do this?</SPAN></BODY></HTML> Fri, 10 Feb 2012 09:20:04 GMT GeospatialTechnology 2012-02-10T09:20:04Z Im confused! Whats the difference between DEM and LIDAR data? https://community.esri.com/t5/data-management-questions/im-confused-whats-the-difference-between-dem-and/m-p/91097#M5350 <HTML><HEAD></HEAD><BODY><SPAN>Help! Can some explain the difference between these two types of data to me?</SPAN><BR /><BR /><SPAN>Which is best for using the Hydrology tools in spatial analyst?</SPAN><BR /><BR /><SPAN>I also want to be able to the slope function to calculate the slope the banks of rivers of streams.</SPAN><BR /><BR /><SPAN>What type of resolution DEM or LIDAR would i need to be able to do this?</SPAN></BODY></HTML> Fri, 10 Feb 2012 09:20:04 GMT https://community.esri.com/t5/data-management-questions/im-confused-whats-the-difference-between-dem-and/m-p/91097#M5350 GeospatialTechnology 2012-02-10T09:20:04Z Re: Im confused! Whats the difference between DEM and LIDAR data? https://community.esri.com/t5/data-management-questions/im-confused-whats-the-difference-between-dem-and/m-p/91098#M5351 <HTML><HEAD></HEAD><BODY><BLOCKQUOTE class="jive-quote">Help! Can some explain the difference between these two types of data to me?<BR /><BR /></BLOCKQUOTE><BR /><BR /><BR /><SPAN> DEM is a raster or with digital value of the elevation at the given pixel. it is continuous data.</SPAN><BR /><BR /><SPAN>LIDAR is laser remotely sensed data, is it laser returns, which are points with known x, y, z values, and other information.</SPAN><BR /><BR /><SPAN>LIDAR data can be used to create DEMs.</SPAN><BR /><BR /><BR /><BLOCKQUOTE class="jive-quote"><BR />Which is best for using the Hydrology tools in spatial analyst?<BR /><BR />I also want to be able to the slope function to calculate the slope the banks of rivers of streams.<BR /></BLOCKQUOTE><BR /><BR /><SPAN>To use hydrology tools and slope function you have to use raster dataset.</SPAN><BR /><BR /><SPAN>The resolution depends on your application and the required accuracy for your project.</SPAN><BR /><BR /><SPAN>For instance if you are mapping the streams at a country or continent scale, 30 m or 50 m DEM can do the job.</SPAN><BR /><SPAN>but for mapping streams in a reservation park for example I will use 1 to 3 m.</SPAN><BR /><BR /><BR /><SPAN>Depending on the data source the DEM will be different.</SPAN><BR /><BR /><SPAN>If the source is surveyed the DEM will most likely represent the ground itself</SPAN><BR /><BR /><SPAN>If the source was radar (InSAR) the DEM is most likely represent the surface with the buildings and streets</SPAN><BR /><BR /><SPAN>Look at DSM (digital surface model) and DTM (digital terrain model)</SPAN><BR /><BR /><SPAN>LIDAR data can be used to derive DSM and bare ground DEM.</SPAN><BR /><BR /><SPAN>If you have LIDAR data I recommend using it to create DSM and bare earth DEM, then use these rasters in the hydrology tools.</SPAN><BR /><BR /><SPAN>Regards,</SPAN><BR /><SPAN>Mohammad Dashti</SPAN></BODY></HTML> Sun, 12 Feb 2012 08:33:13 GMT https://community.esri.com/t5/data-management-questions/im-confused-whats-the-difference-between-dem-and/m-p/91098#M5351 MohammadDashti 2012-02-12T08:33:13Z