Difference between revisions of "Using Airborne Laserscanning Data for Orienteering Base Map Generation"

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=== Create Slope Gradient ===
 
=== Create Slope Gradient ===
 
:Select the settings for '''[[DEM_Import_Wizard#Calculate_Slope_Gradient|Calculate Slope Gradient]]''' as follows.<br>
 
:Select the settings for '''[[DEM_Import_Wizard#Calculate_Slope_Gradient|Calculate Slope Gradient]]''' as follows.<br>
 +
:Check '''Extract cliff features from black pixels'''.<br>
 
[[File:DEMSlopeGradient.png]]
 
[[File:DEMSlopeGradient.png]]
  
[[File:DEMResultSlopeGradient.png]]
+
[[File:DEMResultSlopeGradient.png]]<br>
 +
''Slope Gradient''
  
[[File:DEMResulatExtractCliffs.png]]
+
[[File:DEMResulatExtractCliffs.png]]<br>
 
+
''Cliff features as vector symbol (Slope Gradient Map is dimmed).''
[[File:DEMResultContour2.png]]
 
  
 
=== Classify Vegetation Height ===
 
=== Classify Vegetation Height ===

Revision as of 15:49, 10 July 2018

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. In this tutorial we proceed a LAS-file.

DEMImportFiles.png

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 .

DEMSettings.png

LAS Settings

Select the LAS Settings as follows.
We will need the .ocdlas-File in the LiDAR Point Cloud Manager section.

DEMLasSettings.png

DEMResultLasIntensity.png
DSM Intensity Map

DEMResultLasClassification.png
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.

DEMContourLines.png

DEMResulatContourLines.png
Contour Lines

DEMResultContour1.png
Smoothed contour lines in green, custom contor lines in blue. Orange and red ones for depressions.

Create Hypsometric Map

Select the settings for Create Hypsometric Map as follows.

DEMHypsometricMap.png

DEMResultHypsometric.png
Hypsometric Map

Create Hill Shading

Select the settings for Create Hill Shading as follows.

DEMHillShading.png

DEMResultHillShading.png
Hill Shading

Create Slope Gradient

Select the settings for Calculate Slope Gradient as follows.
Check Extract cliff features from black pixels.

DEMSlopeGradient.png

DEMResultSlopeGradient.png
Slope Gradient

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

Classify Vegetation Height

Select the settings for Classify Vegetation Height as follows.

DEMVegetationHeight.png

DEMResultVegetationHeightMap.png

Extract Features

DEMExtractFeatures.png

DEMResulatExtractFeatures.png

DEMResultTrees.png

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. DEMSummary.png

How to use the output?

After finishing the DEM Wizard the dialog closes automatically and the results are shown.
All raster maps are loaded as background maps.
Contour lines, cliff features and extracted features are assigned to the corresponing symbols in the Symbol box.
All files are stored in the folder you specify in the DEM Settings.


DEMDone.png
DEMBackgroundMaps.png
DEMFiles.png
File:DEMReadyForMapping.png

LiDAR Point Cloud Manager

LPM.png
LPMLoad.png
LPMFilteringClassification.png
LPMFilteringHeightOverGround.png
LPMFilteringIntensity.png
LPMFilteringVegetationDensity.png

LPMMapSample.png
LPMRasterMap.png
LPMProfile2.png