Using Airborne Laserscanning Data for Orienteering Base Map Generation

From OCAD Wiki - English
Revision as of 10:37, 10 July 2018 by ANK (talk | contribs)
Jump to navigation Jump to search

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.

DEMImportWizrad.png

Choose DEM Import File

Choose one or several importable files.

DEMImportFiles.png

DEM Settings

Leave the DEM Settings as they are.

DEMSettings.png

LAS Settings

Leave the LAS Settings as they are.

DEMLasSettings.png

Create Contour Lines

DEMContourLines.png

Create Hypsometric Map

DEMHypsometricMap.png

Create Hill Shading

DEMHillShading.png

Create Slope Gradient

DEMSlopeGradient.png

DEMExtractFeatures.png

Classify Vegetation Height

DEMVegetationHeight.png

Summary

DEMSummary.png

How to use the output?

DEMDone.png

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.

AlsDataImport 1.png

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

AlsDataImport 2.png

Import ALS Data

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

AlsDataImport 3.png

  • 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.

AlsDataImport 4.png

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

AlsDataImport 5.png

Generated Base Maps

  • OCAD changes to the Entire View.

AlsDataImport 6.png

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

AlsDataImport 7.png

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

AlsDataImport 8.png

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