Tutorial Site Familiarisation QGIS

Introduction

QGIS is used to view the aerial image and elevation data of the model.

Method

Set up a workspace to contain aerial imagery and elevation data of the model in correct projection.

Set the Projection

1. Set the projection of the workspace:

   • Go to Project > Properties.
   • In the CRS tab, type 'WGS 84 / UTM zone 60S'.
   • Select the matching projection in the 'Predefined Coordinate Reference Systems' section.
   • Click 'Apply' and 'OK'.

2. Check that the projection is set correctly by viewing the the bottom right hand corner of the workspace. It should read 'EPSG:32760'.
   
   
   
   

Aerial Image

1. Bring in the Aerial, either:

   • From the Aerial_Photo folder, drag and drop the Aerial_Photo_M01.jpg file into the workspace; or
   • Select Layer > Add layer > Add Raster Layer and navigate to the Aerial_Photo folder.

   
   
   
   
2. There are many ways to change symbology. To make the aerial grayscale:

   • Right click on the Aerial_Photo_M01 file in the Layers Panel and select 'Properties'.
   • From the Symbology tab, under 'Layer Rendering' set Grayscale to 'By average'.
   • Click 'Apply' and 'OK'.

   
   
   
   

Elevation Data

1. Bring in the DEM, either:

   • From the DEM folder, drag and drop the DEM.flt file into the workspace; or
   • Select Layer > Add layer > Add Raster Layer and navigate to the DEM folder.

2. Change the symbology of the DEM:

   • Right click on the DEM file in the Layers panel and select 'Properties'.
   • From the Symbology tab, under 'Band Rendering' select the following options:

   • Render type: Singleband pseudocolor
   • Color ramp: Spectral
   • Color ramp: Invert Color Ramp
   • Mode: Equal Interval

   • From the Transparency tab, set the Global Opacity to 75%.
   • Click 'Apply' and 'OK'.

   
   
   
   
3. Include a Hillshade of the DEM:

   • Right click on the DEM file in the Layers panel and select 'Duplicate Layer'.
   • Right click on the DEM_copy and select 'Rename Layer'. Rename the layer to 'DEM_Hillshade'.
   • Right click on the DEM_Hillshade file and select 'Properties'.
   • From the Symbology tab, under 'Band Rendering' select the following options:

   • Render type: Hillshade
   • Z Factor: 3

   • From the Transparency tab, set the Global Opacity to 35%.
   • Click 'Apply' and 'OK'.

   
   
   
   

Save the Workspace

1. It is important to continue to save the workspace throughout the tutorial:

   • Go to Project > Save As.
   • Navigate to the Module_01 folder and type 'M01' as the file name.
   • Click 'Save'.

   
   
   

Conclusion

• The workspace has been set up to contain an aerial image and DEM of the Site in the correct projection.
  

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