Conducting a Viewshed Analysis in QGIS - Revision history

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Process

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Introduction

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Mock Scenario

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	Start by creating a viewshed on the 1km DEM. In the Layers Panel on the left side of QGIS, only have the 1km DEM selected “on”, which will appear as having a checkmark by the layer’s name. Then, start an editing session by clicking on the pencil-looking icon on the Selection Toolbar. Use the wheel of your mouse to pan into Auyuittuq National Park. For reference, view the map provided in the [[Mock Scenario]] section. Then, click the “Add Point Feature” and place a point at the relative location of Thor Peak. A “Viewpoints-Feature Attributes” window will pop up, click OK. Finally, click on the “Save Layer Edits” button in the Selection Toolbar. This will stop the editing session for the Viewpoints shapefile layer.		Start by creating a viewshed on the 1km DEM. In the Layers Panel on the left side of QGIS, only have the 1km DEM selected “on”, which will appear as having a checkmark by the layer’s name. Then, start an editing session by clicking on the pencil-looking icon on the Selection Toolbar. Use the wheel of your mouse to pan into Auyuittuq National Park. For reference, view the map provided in the [[Conducting_a_Viewshed_Analysis_in_QGIS#Mock_Scenario\|Mock Scenario]] section. Then, click the “Add Point Feature” and place a point at the relative location of Thor Peak. A “Viewpoints-Feature Attributes” window will pop up, click OK. Finally, click on the “Save Layer Edits” button in the Selection Toolbar. This will stop the editing session for the Viewpoints shapefile layer.

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 '''Figure 12.''' The 1km resolution DEM viewshed result. Keep in mind that each square pixel is 1km in length and width.
-After completing the viewshed analysis, please consider these questions:
+After completing the viewshed analysis, please consider the following questions as a reflective exercise:
 After comparing all 3 DEM results to each other, consider the proposed platform placement. Would it be better idea to propose a different platform location to TN where hikers could see more based on your results? Also, which DEM served to provide the best/worst viewshed results? Which DEM would you prefer to use if you had to conduct another viewshed analysis elsewhere?

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 '''Figure 12.''' The 1km resolution DEM viewshed result. Keep in mind that each square pixel is 1km in length and width.
+After completing the viewshed analysis, please consider these questions:
-After comparing all 3 DEM results to each other, consider the proposed platform placement. Would it be better idea to propose a different platform location to TN where hikers could see more based on your results?
+After comparing all 3 DEM results to each other, consider the proposed platform placement. Would it be better idea to propose a different platform location to TN where hikers could see more based on your results? Also, which DEM served to provide the best/worst viewshed results? Which DEM would you prefer to use if you had to conduct another viewshed analysis elsewhere?
 =='''Conclusion'''==

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 [[File:QgislogoMattNick.png|caption|border|200px]]
-===Installation of Visibility Analysis Plugin in QGIS===
+===Installation of the Visibility Analysis Plugin in QGIS===
 '''Process'''

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 [[File:QgislogoMattNick.png|caption|border|200px]]
-===Installation of Visiual Analysis Plugin in QGIS===
+===Installation of Visibility Analysis Plugin in QGIS===
 '''Process'''

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 '''Process'''
-Before conducting the Viewshed analysis in QGIS the user will need to install the "Visual Analysis" plugin by:
+Before conducting the Viewshed analysis in QGIS the user will need to install the "Visibility Analysis" plugin by:
-) Open QGIS Desktop.
+) Opening QGIS Desktop.
 ) Select the "Plugins" menu in the toolbar at the top of the screen.

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 ===Viewshed Tool===
-The viewshed analysis is a powerful process which allows users to "know how visible objects might be—for example, from which locations on the landscape will the water towers be visible if they are placed in a particular location," (ArcGis 2020). For this particular tutorial, the Viewshed analysis will be conducted in a QGIS setting. QGIS is a powerful open source software that is available to all users. There is no built in viewshed analysis tool for QGIS, thus forcing the user to install an open source plugin through the plugin function.
+The viewshed analysis is a powerful process which allows users to "know how visible objects might be—for example, from which locations on the landscape will the water towers be visible if they are placed in a particular location," (ArcGis 2020). For this particular tutorial, the Viewshed analysis will be conducted using Quantum GIS (QGIS). QGIS is a powerful open source software that is available to all users. There is no built-in viewshed analysis tool for QGIS, so the user is required to install an open source plugin through the plugin function.
 [[File:QgislogoMattNick.png|caption|border|200px]]

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 '''NOTE:''' This process was conducted using the most recent version of QGIS at the time of writing this tutorial: QGIS Desktop 3.16.
-Ensure that QGIS is downloaded and functions on your computer. [https://qgis.org/en/site/forusers/download.html Click here] to download the latest version of QGIS.
+Ensure that QGIS is downloaded and functions properly on your computer. [https://qgis.org/en/site/forusers/download.html Click here] to download the latest version of QGIS.
 Download the data from the previous section before starting the tutorial.

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	[[File:~~AkshayukPassMap1.1~~.jpg\|caption\|border\|1000px]]		[[File:AkshayukPassMapGoodMattNick.jpg\|caption\|border\|1000px]]

	'''Figure 1.''' The locations of Akshayuk Pass and Thor Peak in Auyuittuq National Park, Nunavut, Canada.		'''Figure 1.''' The locations of Akshayuk Pass and Thor Peak in Auyuittuq National Park, Nunavut, Canada.