Fire Risk Analysis using QGIS - Revision history

Smitchs: /* Setting up the Environments */

2025-10-26T16:52:43Z

Setting up the Environments

Smitchs: /* Setting up the Environments */

2025-10-26T16:52:11Z

Setting up the Environments

Alexlou at 01:17, 2 October 2025

2025-10-02T01:17:42Z

Alexlou at 01:15, 2 October 2025

2025-10-02T01:15:09Z

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Alexlou at 01:00, 2 October 2025

2025-10-02T01:00:59Z

Alexlou at 00:37, 2 October 2025

2025-10-02T00:37:09Z

Alexlou at 00:36, 2 October 2025

2025-10-02T00:36:14Z

Alexlou at 00:32, 2 October 2025

2025-10-02T00:32:22Z

Alexlou at 00:06, 2 October 2025

2025-10-02T00:06:12Z

Alexlou at 00:03, 2 October 2025

2025-10-02T00:03:32Z

@@ Line 117: / Line 117: @@
 ==Tutorial==
 ===Setting up the Environments===
-In QGIS 3.42.2, the environment is already setup and ready to use for the analysis in this tutorial, unlike older versions. The only two plugins you need to install are the multi-distance buffer and the GRASS GIS tool. Next you need to setup the coordinate system. By clicking on 'Project' tab then properties, nder the CRS Tab, choose an appropriate coordinate reference system. We chose WGS 84 (ESPG:4326) for this project; however for many mapping products, a projected coordinate system is preferable such as a local UTM or Web Mercator. More information on what CRS to use can be found here
+In QGIS 3.42.2, the environment is already setup and ready to use for the analysis in this tutorial, unlike older versions. The only two plugins you need to enable are the multi-distance buffer and the GRASS GIS tool. Next you need to setup the coordinate system. By clicking on 'Project' tab then properties, nder the CRS Tab, choose an appropriate coordinate reference system. We chose WGS 84 (ESPG:4326) for this project; however for many mapping products, a projected coordinate system is preferable such as a local UTM or Web Mercator. More information on what CRS to use can be found here
 [[File:Plugins_tab.png]]

@@ Line 117: / Line 117: @@
 ==Tutorial==
 ===Setting up the Environments===
-In QGIS 3.42.2, the environment is already setup and ready to use; unlike older versions. The only two plugins you need to install is the multi-distance buffer and the GRASS GIS tool. Next you need to setup the coordinate system. By clicking on 'Project' tab then properties, nder the CRS Tab, choose an appropriate coordinate reference system. We chose a WGS 84 (ESPG:4326) for this project; however for many mapping products, a projected coordinate system is preferable such as a local UTM or Web Mercator. More information on what CRS to use can be found here
+In QGIS 3.42.2, the environment is already setup and ready to use for the analysis in this tutorial, unlike older versions. The only two plugins you need to install are the multi-distance buffer and the GRASS GIS tool. Next you need to setup the coordinate system. By clicking on 'Project' tab then properties, nder the CRS Tab, choose an appropriate coordinate reference system. We chose WGS 84 (ESPG:4326) for this project; however for many mapping products, a projected coordinate system is preferable such as a local UTM or Web Mercator. More information on what CRS to use can be found here
 [[File:Plugins_tab.png]]

@@ Line 343: / Line 343: @@
 The next step will be to '''Right click''' your Vancouver Island shapefile, open '''Properties''' and on the left side of '''Layer Properties''' you will see a tab called '''Joins'''.
-It will open a prompt and ask you which '''Join Layer''' (''Population attribute data'') you would like along with '''Join Field''' (''COL0'') and the '''Target Field''' (''CSDUID'') which we all identified in the last step, ensure '''Create attribute index on join field''' is also selected (''Figure 27'').
+It will open a prompt and ask you which '''Join Layer''' (''Population attribute data'') you would like along with '''Join Field''' (''COL0'') and the '''Target Field''' (''CSDUID'') which we all identified in the last step, ensure '''Create attribute index on join field''' is also selected (''Figure 20'').
 [[File:FRA_VectorJoin.png]]
-''Figure 27.'' How to add a vector join to obtain population data per CSD.
+''Figure 20.'' How to add a vector join to obtain population data per CSD.
 Your Vancouver Island shapefile will also now have the population data, which will be under the header named '''COL7''', you can change the symbology to your desire, it is a good idea to do so because it will help with the reclassification method. So again open your '''Layer Properties''' naviagate to the '''Style''' tab, using '''COL7''' a '''[http://www.ncgia.ucsb.edu/cctp/units/unit47/html/comp_class.html Quantile]''' mode with '''4 classes''' and apply whichever color ramp you wish to the data (''Figure 28'').
@@ Line 353: / Line 353: @@
 [[File:FRA_StyleIsalnd.png]]
-''Figure 28.'' The style tab of layer properties, which was used in order to visualize areas of high population on the Island - we changed the color scheme from ''Green'' to a different color scheme which you will notice in figure 29, however the same classification methods were applied.
+''Figure 21.'' The style tab of layer properties, which was used in order to visualize areas of high population on the Island - we changed the color scheme from ''Green'' to a different color scheme which you will notice in figure 29, however the same classification methods were applied.
 Since your shapefile is not permanent you will have to save it as a new shapefile, by right clicking it and saving at as a new shapefile, use the '''Clip''' tool located under the '''Vector''' and '''Geoprocessing''' tabs and clip the new shapefile to the study area.
@@ Line 367: / Line 367: @@
 thru 109752 = '''4'''
-After the tool has run you should have your new raster ready for the vulnerability calculations (''Figure 29'').
+After the tool has run you should have your new raster ready for the vulnerability calculations (''Figure 22'').
 [[File:FRA_IslandDensity.png]]
-''Figure 29.'' Population per census subdivision reclassified.
+''Figure 22.'' Population per census subdivision reclassified.
 ===Hazard, Vulnerability and Mitigation Raster Calculations===
@@ Line 387: / Line 387: @@
 [[File:FRA_FinalHazardCalc.PNG]][[File:FRA_FinalHazardMap.PNG]]
-''Figure 30.'' Weighted calculation and hazard output map.
+''Figure 23.'' Weighted calculation and hazard output map.
 =====Vulnerability Calculation=====
@@ Line 401: / Line 401: @@
 [[File:FRA_FinalVulnerabilityCalc.PNG]][[File:FRA_FinalVulnerabilityMap.PNG]]
-''Figure 31.'' Vulnerability calculation and vulnerability output map.
+''Figure 24.'' Vulnerability calculation and vulnerability output map.
 =====Mitigation Calculation=====
@@ Line 408: / Line 408: @@
 [[File:FRA_FinalMitigationMap.PNG]]
-''Figure 32.'' Mitigation output map.
+''Figure 25.'' Mitigation output map.
 ===Final Calculation using Cell Statistics===
@@ Line 417: / Line 417: @@
 [[File:FRA_FinalCalc.PNG]][[File:FRA_THE_MAP_CHEERS.PNG]]
-''Figure 33.'' GRASS cell statistic tool to summarize all cells, and the final risk output map.
+''Figure 26.'' GRASS cell statistic tool to summarize all cells, and the final risk output map.
 ===Identifying Zones of High Risk Using Zonal Statistics===
@@ Line 426: / Line 426: @@
 [[File:FRA_25KMGRID.PNG]][[File:FRA_ZONALQGIS.PNG]][[File:ZonalStatsMap.PNG]]
-''Figure 34.'' How to create the vector grid, and apply zonal statistics based on the final risk map and the grid to create the final output map.
+''Figure 27.'' How to create the vector grid, and apply zonal statistics based on the final risk map and the grid to create the final output map.
 ==Conclusion==

@@ Line 117: / Line 117: @@
 ==Tutorial==
 ===Setting up the Environments===
-In QGIS 3.42.2, the environment is already setup and ready to use; unlike older versions. The required plugins can be found within the toolbox, under the processing tab.
+In QGIS 3.42.2, the environment is already setup and ready to use; unlike older versions. The only two plugins you need to install is the multi-distance buffer and the GRASS GIS tool. Next you need to setup the coordinate system. By clicking on 'Project' tab then properties, nder the CRS Tab, choose an appropriate coordinate reference system. We chose a WGS 84 (ESPG:4326) for this project; however for many mapping products, a projected coordinate system is preferable such as a local UTM or Web Mercator. More information on what CRS to use can be found here
+[[File:Plugins_tab.png]]
 ===Importing the Data===

@@ Line 278: / Line 278: @@
 After this we can then use the heatmap plugin that we installed during the beginning of this tutorial which is located in the '''Raster''' tab. You will input the newly created shapefile of the three merged past fires point that you just completed and create a heatmap based upon the clustering of points. For the purpose of this tutorial create a radius of approximately 50 000 metres (''Figure 15'').
-[[File:heatmap.PNG]]
+[[File:Heatmap.png]]
 [[File:Heatmap toolbox.png]]

@@ Line 269: / Line 269: @@
 ===Spatial Pattern and Heatmap of Past Fires===
-The three past fires point shapefiles will need to be merged. In order to complete this process we will have to merge all the past fire point shapefiles in order to create the points we will use to create a heatmap. We will use the '''Merge Shapefiles to One''' tool, which is located under the '''Vector''' tab and located within the '''Data Management''' tab. Merge all of the point shapefiles located under a single directory (''Figure 20'').
+The three past fires point shapefiles will need to be merged. In order to complete this process we will have to merge all the past fire point shapefiles in order to create the points we will use to create a heatmap. We will use the '''Merge Shapefiles to One''' tool, which is located under the '''Vector''' tab and located within the '''Data Management''' tab. Merge all of the point shapefiles located under a single directory (''Figure 14'').
 [[File:FRA_MergeTool.PNG]][[File:FRA_MergePoint.PNG]]
-''Figure 20.'' The merge tool, in order to combine all past fire points to one.
+''Figure 14.'' The merge tool, in order to combine all past fire points to one.
-After this we can then use the heatmap plugin that we installed during the beginning of this tutorial which is located in the '''Raster''' tab. You will input the newly created shapefile of the three merged past fires point that you just completed and create a heatmap based upon the clustering of points. For the purpose of this tutorial create a radius of approximately 50 000 metres (''Figure 21'').
+After this we can then use the heatmap plugin that we installed during the beginning of this tutorial which is located in the '''Raster''' tab. You will input the newly created shapefile of the three merged past fires point that you just completed and create a heatmap based upon the clustering of points. For the purpose of this tutorial create a radius of approximately 50 000 metres (''Figure 15'').
-[[File:FRA_heatmap_tool.PNG]][[File:FRA_heatmap_param.PNG]]
+[[File:FRA_heatmap_tool.PNG]][[File:Heatmap toolbox.png]]
-''Figure 21.'' Location of the heatmap tool and parameters that will be used for this analysis.
+''Figure 15.'' Location of the heatmap tool and parameters that will be used for this analysis.
-After you run the tool your heatmap based on the spatial pattern of points will appear as a raster and will have values associated with it - high values indicating areas where clustering is more present and low values indicating little to no clustering. You will want to use the '''clipper''' tool to clip it to the area of interest. The next step will be to reclassify the values of the heatmap outputted so you can calculate it later on. Use the '''r.reclass''' tool which is found in the advanced interface toolbox to complete it. After the heatmap is reclassified and the tool is run you will be able to use it in your calculation (''Figure 22''), open a word processor and type the following justification:
+After you run the tool your heatmap based on the spatial pattern of points will appear as a raster and will have values associated with it - high values indicating areas where clustering is more present and low values indicating little to no clustering. You will want to use the '''clipper''' tool to clip it to the area of interest. The next step will be to reclassify the values of the heatmap outputted so you can calculate it later on. Use the '''r.reclass''' tool which is found in the advanced interface toolbox to complete it. After the heatmap is reclassified and the tool is run you will be able to use it in your calculation (''Figure 16''), open a word processor and type the following justification:
 thru 125 = '''4'''
@@ Line 296: / Line 296: @@
 [[File:FRA_HM_CLIPPER.PNG]][[File:FRA_HM_Reclass.PNG]] [[File:FRA_HM_MAP_reclass.PNG]]
-''Figure 22.'' Clipping the heatmap raster to the study area, then reclassifying the heatmap along with the the output produced from reclassification.
+''Figure 16.'' Clipping the heatmap raster to the study area, then reclassifying the heatmap along with the the output produced from reclassification.
 ===Clipping, Buffering and Rasterizing Mitigation Factors===

← Older revision		Revision as of 00:06, 2 October 2025
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	[[File:FRA_reclass_tbox~~.PNG]][[File:FRA_NDVI_RECLASS_TXT~~.PNG]]		[[File:FRA_reclass_tbox.PNG]]


	[[File:FRA_NDVI_reclass.PNG]][[File:FRA_NDVI_MAP1.PNG]]		[[File:FRA_NDVI_reclass.PNG]][[File:FRA_NDVI_MAP1.PNG]]

@@ Line 262: / Line 262: @@
 to 16 = '''4'''
-[[File:FRA_SlopeAspectR.PNG]] [[File:FRA_SlopeWind_txt.PNG]]
+[[File:FRA_SlopeAspectR.PNG]]
+[[File:FRA_WindMa.PNG]]
 ''Figure 13.'' Map for reclassified slope and aspect calculation, then the reclassification scheme for the newly created raster and the final output of the ''wind'' raster which will be used in the final calculation.