Tutorial Site Familiarisation QGIS: Difference between revisions

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Created page with "= Introduction = QGIS is used to view the aerial image and elevation data of the model.<br> <br> = Method = Set up a workspace to contain aerial imagery and elevation data of..."
 
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:*Select the matching projection in the 'Predefined Coordinate Reference Systems' section.
:*Select the matching projection in the 'Predefined Coordinate Reference Systems' section.
:*Click 'Apply' and 'OK'.
:*Click 'Apply' and 'OK'.
<li>Check that the projection is set correctly by viewing the the bottom right hand corner of the workspace. It should read 'EPSG:32760'.<br>
<li>Check that the projection is set correctly by viewing the bottom right hand corner of the workspace. It should read 'EPSG:32760'.<br>
<br>
<br>
{{Video|name=Animation_M01_Projection_a.mp4|width=1279}}<br>
[[File:Animation M01 Projection.gif]]<br>
<br>
<br>
</ol>
</ol>
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:*Select Layer > Add layer > Add Raster Layer and navigate to the '''Aerial_Photo''' folder.
:*Select Layer > Add layer > Add Raster Layer and navigate to the '''Aerial_Photo''' folder.
<br>
<br>
{{Video|name=Animation_M01_Aerial_01a.mp4|width=1279}}<br>
[[File:Animation M01 Aerial 01.gif]]<br>
<br>
<li>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'.
<br>
[[File:Animation M01 Aerial 02.gif]]<br>
<br>
<br>
</ol>
</ol>
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<ol>
<ol>
<li>Bring in the DEM, either:
<li>Bring in the DEM, either:
:*From the '''DEM''' folder, drag and drop the '''DEM.flt''' file into the workspace; or
:*From the '''DEM''' folder, drag and drop the '''DEM.tif''' file into the workspace; or
:*Select Layer > Add layer > Add Raster Layer and navigate to the '''DEM''' folder.
:*Select Layer > Add layer > Add Raster Layer and navigate to the '''DEM''' folder.
<li>Change the symbology of the DEM:
<li>Change the symbology of the DEM:
:*Right click on the DEM file in the Layers panel and select 'Properties'.
:*Right click on the '''DEM''' file in the Layers panel and select 'Properties'.
:*From the Symbology tab, under 'Band Rendering' select the following options:
:*From the Symbology tab, under 'Band Rendering' select the following options:
::*Render type: Singleband pseudocolor
::*Render type: Singleband pseudocolor
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:*Click 'Apply' and 'OK'.
:*Click 'Apply' and 'OK'.
<br>
<br>
{{Video|name=Animation_M01_DEM_01d.mp4|width=1279}}<br>
[[File:Animation M01 DEM 01b.gif]]<br>
<br>
<br>
<li>Include a Hillshade of the DEM:
<li>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''' 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_copy''' and select 'Rename Layer'. Rename the layer to '''DEM_Hillshade'''.
:*Right click on the DEM_Hillshade file and select 'Properties'.
:*Right click on the '''DEM_Hillshade''' file and select 'Properties'.
:*From the Symbology tab, under 'Band Rendering' select the following options:
:*From the Symbology tab, under 'Band Rendering' select the following options:
::*Render type: Hillshade
::*Render type: Hillshade
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:*Click 'Apply' and 'OK'.
:*Click 'Apply' and 'OK'.
<br>
<br>
{{Video|name=Animation_M01_DEM_02c.mp4|width=1279}}<br>
[[File:Animation M01 DEM 02a.gif]]<br>
<br>
<br>
</ol>
</ol>

=== Save the Workspace ===
<ol>
<li>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'.
<br>
[[File:Animation M01 Save.gif]]<br>
</ol>
<br>


= Conclusion =
= Conclusion =
:*The workspace has been set up to contain an aerial image and DEM of the Site in the correct projection.<br>
:*The workspace was set up to contain an aerial image and DEM of the site in the correct projection.<br>
<br>
<br>
{{Tips Navigation
{{Tips Navigation

Latest revision as of 16:22, 14 August 2023

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 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.



Elevation Data

  1. Bring in the DEM, either:
    • From the DEM folder, drag and drop the DEM.tif 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'.



Conclusion

  • The workspace was set up to contain an aerial image and DEM of the site in the correct projection.


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