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uniDEM Tutorials

The following tutorials provide step by step walkthroughs intended to present aid in uniDEM usage and process development. They are incremental from data loading through editing and analysis.

Getting Started

These examples provide introductory guides to introduce the methods to load and interact with geospatial datasets in uniDEM.

Introduction to uniDEM

Duration: 15 minutes 30m DEM
A brief introduction describing how to install and use uniDEM.
  • Load a digital elevation model (DEM)
  • View the DEM
  • Zoom, pan and rotate
  • Toggle between 2D and 3D views

Select Areas to Edit

Duration: 20 minutes Select DEM pixels
Learn how to select areas using different selection tools and options to perform DEM edits.
  • Select using drawing tools like polygons and rectangles
  • Select using flood filling
  • Select All
  • Undo
  • Clear selection
Fill Voids
Duration: 10 minutes large void fill
Learn how to fill voids in a Digital Surface Model (DSM) by interpolation
  • Fill within a square (kernel) region
  • Fill using tringulation

Working with Lidar Point clouds

These examples provide a guide to viewing, classifying and creating derivative products from lidar point clouds in LAS and LAZ formats using uniDEM.

Lesson 1: Visualize Lidar Data

Duration: 20 minutes view las with unidem
Learn how to load, visualize and interact with lidar point clouds.
  • Load lidar points
  • Display lidar points
  • Interact with the 3D data view
  • View individual point classifications
  • Profile lidar point classifications in LAZ files
  • Turn On/Off lidar point Classes in 3D views
  • Change lidar point colors

Lesson 2: Explore and Classify Lidar Data

Duration: 20 minutes manually classify las with unidem
Learn how interpret and modify LAS classifications interactively.
  • Understand LAS classifications between versions
  • Load LAZ and upgrade to LAS 1.4
  • View specific classification values
  • Reassign classification values
  • Classify points using polygons
  • Improve classifications

Lesson 3: Create Derivative Products

Duration: 20 minutes create dem from las
Learn how create raster and vector products from LAS data
  • Load multiple lidar point files
  • Crop and merge lidar point data into new files
  • Create a Digital Elevation Model (DEM) raster from lidar
  • Create a Digital Surface Model (DSM) rasterfrom lidar
  • Create a Height Above Ground raster
  • Create an Intensity image from Lidar Metadata
  • Create a Height Above Ground raster

Lesson 4: Automatic Lidar Classification

Duration: 10 minutes automatic lidar classification
Learn how automatically classify lidar data.
  • Load multiple lidar point files
  • Create supporting raster data
  • Create 2D land use classifications
  • Create 3D hyrdological breaklines
  • Classify lidar points

DEM Editing

These examples provide a guide to editing elevation data in gridded format (DEM) using uniDEM.

Hydro Edit (Rivers)


Duration: 30 minutes flatten river
Water must be flat, and flowing water like rivers and streams must flow downhill.
  • Classify river using 2D shapefiles
  • Flatten rivers provided flow in the DEM
  • Ensure water containment by raising shorelines
  • Export 3D water breaklines as shapefiles
Water must be flattened to an equal elevation for standing water such as lakes and oceans.
  • Classify Water as Ocean using Floodfill
  • Clean up Misclassifications
  • Edit Water Heights
  • Contain water by raising shorelines
  • Ensure water containment by raising shorelines