The sample data used in this lesson is 3DEP lidar data in two LAZ files containing LAS version 1.2 points located in Madison, MS, USA.
Prior to commencing this lesson, please download the sample data:
An AGL is a raster grid of the highest height of a point of a first surface above ground height illustrating building and vegetation heights.
This is created by subtracting the DEM from the DSM.
Within the DEM tab click Difference
Select the DSM dataset for raster 1 in the dropdown list
Select the DEM dataset for raster 2 in the dropdown list
Click OK to select DEM for the output type
Enter AGL to name the difference output
Press Esc key to clear selection
Close right data view
Click into the remaining data view
Press Ctrl-T to scale the data view
Right click DSM,or New DEM(1) in the TOC and select Uncheck All to turn off DSM
Right click AGL in the TOC and select Check All to turn on AGL
Press F12 key and enter "20" to set the elevation color scale to ±20m
Each LAS point has metadata holding the intensity return of the light pulse from the source.
Intensity returns are variable dependent on the material that the pulse interfaces with and can be used for interpretation and classification.
Within the LIDAR tab click Points to Image
Select A loaded point cloud from the input
Select the Madison dataset
Click Select All to pick both LAZ files
Select Copy From an existing dataset to define projection and extents
Select the Madison dataset to define the extents
Click OK to use the recommended pixel spacing and extents
Select intensity to use for the image value
Select 16-bit values for output format to create a gray scale image
Select Maximum for the algorithm to use
Click Select All to use all classes when creating the grid
Click OK to "Use all points"
Name the output as Intensity - licensed mode only. Otherwise the layer will be named New Image
Right Click Intensity (New Image) in the TOC
Click Check All to display the Intensity image draped over the AGL
Scale Image for viewing
Right Click Intensity dataset and select Properties
Select Auto Contrast (Global) radio button and click OK