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.

DEM Settings

In this tutorial, we have a look at all possible outputs. However, not all of them make sense for mapping. We will have a look at it in the Result section. So, enter the DEM Settings as follows.

LAS Settings

Select the LAS Settings as follows.

Create Contour Lines

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.

Create Hypsometric Map

Select the settings for Create Hypsometric Map as follows.

Create Hill Shading

Select the settings for Create Hill Shading as follows.

Create Slope Gradient

Classify Vegetation Height

Summary

How to use the output?

Import the Additional Symbol for the Contour Lines from ALS Data

• Press the Shift key and click File -> Import: OCAD opens the file chooser in Templates folder. Choose the file 'Template DEM Contour Lines.ocd'.
• In Import OCAD Map dialog choose the options Import all Symbols and colors and Import colors at the top of the color table. Click OK.

OCAD added 3 new symbols for the contour lines (1m, 5m, 25m) at the end of the symbol table.

Import ALS Data

• Click DEM -> Import. The DEM Import Wizard appears.
• Click Add and choose the four ALS tiles in rar file format.

• Click Next. OCAD reads the ALS data. This takes some seconds.

Create Base Maps

• Click Next 2 times.
• Change the 3 line symbols to the imported symbols.

• Click Next 5 times until OCAD starts with the generation process.
• Click OK when OCAD ask to georeference the map. This takes some minutes.

Generated Base Maps

• OCAD changes to the Entire View.

• Zoom in to see the calculated 1m contour lines and the vegetation map.

• Click Background Maps -> Manage to hide the hide the calculated raster background maps.

For more information about the different background maps see the DEM Import Wizard page .