Using Airborne Laserscanning Data for Orienteering Base Map Generation

This tutorial shows a possible way to proceed LiDAR data in OCAD and how to use them when drawing orienteering maps. You find more detailed information about the DEM Wizward here.

Open New File

Open OCAD.

Go to File -> New -> Orienteering map: Choose a symbol set for orienteering maps and choose the scale (e.g Orienteering Map ISOM 2017 10000.ocd).

Save the newly created file under File -> Save.

DEM Wizard

Open the DEM Wizard

Open the DEM Import Wizard in the DEM Menu.

Choose DEM Import File

Choose one or several importable files. In this tutorial we proceed a LAS-file.

DEM Settings

In this tutorial, we have a look at all possible outputs. However, not all of them make sense for mapping. Enter the DEM Settings as follows.

Here you can choose your favourite folder (in the upper right corner under File name) where all files should be stored .

LAS Settings

Select the LAS Settings as follows.

We will need the .ocdlas-File in the LiDAR Point Cloud Manager section.

DSM Intensity Map

DSM Classification Map

Create Contour Lines

Select the settings for Create Contour Lines as follows.

Activate both boxes Create custom contours (no smoothing) and Create smoothed contours using TPI.

Choose as contour intervall 1m/5m/25m.

Click on Load symbols from template to get 12 line symbols at the bottom of your symbol box. The boxes will be filled automatically.

Choose Use different symbols for depression to distinguish depressions from hills.

Contour Lines

Create Hypsometric Map

Select the settings for Create Hypsometric Map as follows.

Hypsometric Map

Create Hill Shading

Select the settings for Create Hill Shading as follows.

Hill Shading

Create Slope Gradient

Select the settings for Calculate Slope Gradient as follows.

Check Extract cliff features from black pixels.

Slope Gradient

Cliff features as vector symbol (Slope Gradient Map is dimmed).

Classify Vegetation Height

Select the settings for Classify Vegetation Height as follows.

Vegetation Height Map

Extract Features

Summary

This dialog is only visible in DEM Import Wizard. It shows the progress of the different functions. During the calculation, a message concerning georeferncing the map will pop up (unless the map is already georefernced). Do not change anything and click on Ok. After finishing the process the dialog closes automatically.