Hazardous Areas Around Linear Infrastructure - Revision history

RichardR at 05:02, 22 December 2019

2019-12-22T05:02:44Z

RichardR at 04:54, 22 December 2019

2019-12-22T04:54:58Z

RichardR at 04:53, 22 December 2019

2019-12-22T04:53:49Z

RichardR at 04:52, 22 December 2019

2019-12-22T04:52:43Z

RichardR at 04:51, 22 December 2019

2019-12-22T04:51:03Z

RichardR at 04:46, 22 December 2019

2019-12-22T04:46:13Z

RichardR at 04:44, 22 December 2019

2019-12-22T04:44:04Z

RichardR at 04:24, 22 December 2019

2019-12-22T04:24:12Z

Show changes

RichardR at 16:22, 21 December 2019

2019-12-21T16:22:32Z

RichardR at 16:21, 21 December 2019

2019-12-21T16:21:57Z

@@ Line 227: / Line 227: @@
 [[File:RasterCalculatorTool.jpg|center|700px]]
-On the raster Calculator window for the slope layer, Under "Raster Bands" select the Slope Vorarlberg layer.  Under "Output Layer", select a name for the new layer file for the  selected areas in the appropriate directory. In the "Raster Calculator Expression" window, double click on the Slope Vorarlberg layer in the "Raster Bands" box and the operator buttons to enter the following equation:
+On the raster Calculator window for the slope layer, under "Raster Bands" select the SlopeVorarlberg layer.  Under "Output Layer", select a name for the new layer file for the  selected areas in the appropriate directory. In the "Raster Calculator Expression" window, double click on the SlopeVorarlberg layer in the "Raster Bands" box and the operator buttons to enter the following equation:
 "SlopeVorarlberg@1" > 25
@@ Line 233: / Line 233: @@
 Then press okay to start the selection operation.
-For the Land Use layer, under "Raster Bands" in the "Raster Calculator" window, select the Land Use Vorarlberg layer.  Under "Output Layer", select a name for the new layer file for the selected areas in the appropriate directory. In the "Raster Calculator Expression" window, use double clicks on the Land Use Vorarlberg layer in the "Raster Bands" box and the operator buttons to enter the following equation:
+For the Land Use layer, under "Raster Bands" in the "Raster Calculator" window, select the LandUseVorarlberg layer.  Under "Output Layer", select a name for the new layer file for the selected areas in the appropriate directory. In the "Raster Calculator Expression" window, use double clicks on the LandUseVorarlberg layer in the "Raster Bands" box and the operator buttons to enter the following equation:
 "LandUseVorarlberg@1" = 332 OR "LandUseVorarlberg@1" = 333
@@ Line 250: / Line 250: @@
 In both layers, the white areas are the ones that are potentially hazardous.
-In order to further utilize the slope and land use raster layers with the selected areas, they must be converted into vector layers.  To do this, the procedure is the same for both layers.  Select "Raster" on the main menu at the top, then "Conversion" on the drop down menu, then "Polygonize (Raster to Vector)'. For the SlopeVorarlbergGT25 layer, select that file as the "Input layer", then. under "Vectorized", input a file name for the new VorarlbergSlopeGT25 layer in the appropriate project directory.  Press Run to start the conversion process. The process is the same for the Land Use layer.
+In order to further utilize the slope and land use raster layers with the selected areas, they must be converted into vector layers.  To do this, the procedure is the same for both layers.  Select "Raster" on the main menu at the top, then "Conversion" on the drop down menu, then "Polygonize (Raster to Vector)'. For the SlopeVorarlbergGT25 layer, select that file as the "Input layer", then, under "Vectorized", input a file name for the new VorarlbergSlopeGT25 layer in the appropriate project directory.  Press Run to start the conversion process. The process is the same for the Land Use layer.
@@ Line 262: / Line 262: @@
-Unfortunately, the vectored layer output for both layers have an invalid geometry. To correct this problem, and make the layers usable for the rest of the analysis, a new vector layer must be created for each original layer with a buffer of zero. The procedure to do this for both layers is the same.  Select ""Vector" from the main menu at the top, then "Geoprocessing tools", and then "Buffer".  For the slope vector, select the SlopeVoralbergGT25FinalVector layer as the "Input layer" in the Buffer window, set the "Distance" to zero, and select a file name and directory for the new SlopeGT25VectorBuffered layer under "Buffered" and place in the appropriate directory.  Leave all the other settings at their default. Press Run start the buffering process.  The procedure is the same for the land use layer using the LandUse332333 vector file.
+Unfortunately, the vectored layer output for both layers have an invalid geometry. To correct this problem, and make the layers usable for the rest of the analysis, a new vector layer must be created for each original layer with a buffer of zero. The procedure to do this for both layers is the same.  Select "Vector" from the main menu at the top, then "Geoprocessing tools" and then "Buffer".  For the slope vector, select the SlopeVoralbergGT25FinalVector layer as the "Input layer" in the Buffer window, set the "Distance" to zero, and select a file name and directory for the new SlopeGT25VectorBuffered layer under "Buffered" and place in the appropriate directory.  Leave all the other settings at their default. Press Run to start the buffering process.  The procedure is the same for the land use layer using the LandUse332333 vector file.
@@ Line 285: / Line 285: @@
 The final stage of this analysis is to intersect the five layers that have been used to define potentially hazardous areas (based on Annual Rainfall, Geology, Soils, Land Use and Slope)to determine the final area where the characteristics combine to make the area a combined hazardous area.  To do this, a series of intersection operations are performed:
-Annual Rainfall intersected with Geology to give AnnualRainfallGeologyIntersection
+Annual Rainfall intersects with Geology to give AnnualRainfallGeologyIntersection
-AnnualRainfallGeology intersected with Soils to give AnnualRainfallGeologySoilsIntersection
+AnnualRainfallGeology intersects with Soils to give AnnualRainfallGeologySoilsIntersection
-AnnualRainfallGeologySoils intersected with Land Use to give AnnualRainfallGeologySoilsLandUseIntersection
+AnnualRainfallGeologySoils intersects with Land Use to give AnnualRainfallGeologySoilsLandUseIntersection
-AnnualRainfallGeologySoilsLandUse intersected with Slope to give AnnualRainfallGeologySoilsLandUseSlopeIntersection
+AnnualRainfallGeologySoilsLandUse intersects with Slope to give AnnualRainfallGeologySoilsLandUseSlopeIntersection
-To give the final combined hazardous areas with the 1000 metre railway buffer:
+To give the final combined hazardous areas within the 1000 metre railway buffer:
 AnnualRainfallGeologySoilsLandUseSlope intersects with Rail Buffer to give AnnualRainfallGeologySoilsLandUseSlopeRailBufferIntersection
-To create the intersection layers, select "Vector" from the top menu, then "Geoprocessing Tools", then "Intersection".
+To create the intersection layers, select "Vector" from the top menu, then "Geoprocessing Tools" and then "Intersection".
 [[File:VectorIntersectionTool.jpg|centre|700px]]
@@ Line 300: / Line 300: @@
-In the intersection window, under "Input Layer" select the first of the two layers that are to be intersected.  In the "Overlay layer", select the second layer that is to be intersected. Under "Advanced Parameters, a new filename is entered for the new intersection file that is saved in the appropriate project directory. Leave all other options at their default settings. Pressing "Run" starts the intersection process. The Intersection Window for each of the five intersections are shown below with their output layers.
+In the intersection window, under "Input Layer" select the first of the two layers that are to be intersected.  In the "Overlay layer", select the second layer that is to be intersected. Under "Advanced Parameters", a new filename is entered for the new intersection file that is saved in the appropriate project directory. Leave all other options at their default settings. Pressing "Run" starts the intersection process. The Intersection Window for each of the five intersections are shown below with their output layers.

@@ Line 188: / Line 188: @@
 Land Use
-The raster layers must then be clipped to the extent of Vorarlberg Land.  To accomplish this, "Raster" must be selected from the top menu, and "Extraction" from the drop down menu.
+The raster layers must then be clipped to the extent of Vorarlberg Land.  To accomplish this, "Raster" must be selected from the top menu and "Extraction" from the drop down menu.
 [[File:RasterClipTool.jpg|center|600px]]

← Older revision		Revision as of 04:53, 22 December 2019
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	Look for the small button to the right of the "Delete All" button. Press the button, select "Load colour map from file", and add the CLC2018+CLC2018_V2018_20_QGIS text file from the "Legend"directory of the unzipped land use data. This will add the legend information under the land use layer in the main "Layer"window.		Look for the small button to the right of the "Delete All" button. Press the button, select "Load colour map from file", and add the CLC2018+CLC2018_V2018_20_QGIS text file from the "Legend" directory of the unzipped land use data. This will add the legend information under the land use layer in the main "Layer"window.

← Older revision		Revision as of 04:52, 22 December 2019
Line 209:		Line 209:


	Look for the small button to the right of the "Delete All" button. Press the button, select "Load colour map from file", and add the CLC2018+CLC2018_V2018_20_QGIS text file from the "Legend"directory of the unzipped land use data.		Look for the small button to the right of the "Delete All" button. Press the button, select "Load colour map from file", and add the CLC2018+CLC2018_V2018_20_QGIS text file from the "Legend"directory of the unzipped land use data. This will add the legend information under the land use layer in the main "Layer"window.

← Older revision		Revision as of 04:51, 22 December 2019
Line 209:		Line 209:


	Look for the small button to the right of the "Delete All" button.		Look for the small button to the right of the "Delete All" button. Press the button, select "Load colour map from file", and add the CLC2018+CLC2018_V2018_20_QGIS text file from the "Legend"directory of the unzipped land use data.

@@ Line 206: / Line 206: @@
 To identify the land use/cover classes in the land use layer, the legend will have to be added to the layer. The legend can be found in the "Legend"directory of the unzipped land use data. To add the legend, select the LandUseVorarlberg layer in the "Layers" window of the main page, right click on it, select "Properties", then select "Symbology",
+[[File:AddLegend.jpg|center|600px]]
-[[File:

@@ Line 141: / Line 141: @@
 After entering the above equation in the “ Select by Expression” box, press “Select Features” at the bottom of the window and the selected features will be highlighted in the attribute table and map layer.
-Select By Attributes Windows
 [[File:SelectByAttributesRainfall.JPG|520px]]
@@ Line 206: / Line 203: @@
 [[File:LandUseVoralbergPic.JPG|500px|frameless|caption]]
 Land use layer clipped to the extent of Vorarlberg area.
+To identify the land use/cover classes in the land use layer, the legend will have to be added to the layer. The legend can be found in the "Legend"directory of the unzipped land use data. To add the legend, select the LandUseVorarlberg layer in the "Layers" window of the main page, right click on it, select "Properties", then select "Symbology",
+[[File:
+Look for the small button to the right of the "Delete All" button.
 In order to find areas with hazardous slopes, the DEM layer will have to be converted into a slope layer. To do this, "Raster" is selected from the top menu, then "Analysis" from the drop down menu, then "Slope".

@@ Line 73: / Line 73: @@
 To re-project the three vector files, select “Vector” from the top menu, then “Data Management Tools” and “Reproject Layer”.
 [[File:VectorReprojectTool.jpg|center|600px]]
 On the “Reproject Layer” window, select the layer to be re-projected as the “Input Layer” and the “Target CRS” as EPSG:31254-MGI/Austria GK West.  The “Reprojected” box is used to setup the file for the re-projected layer.  Press the “…” button, select “Save to File’, select the project folder and a file name for the re-projected file.   The image below shows the “Reproject Layer” window for the vector files that need to be re-projected:

@@ Line 72: / Line 72: @@
 In order to prepare the vector files for use, they need to have the correct projection: EPSG:31254 MGI/Austria GK West. The "Political" and "Annual rainfall" vectors have the correct projection, so the three remaining vector layers need to be re-projected: Austrian rail network, Geology, and Soil.
-To re-project the three vector files, select “Vector” from the top menu, then “Data Management Tools” and “Reproject Layer”.  On the “Reproject Layer” window, select the layer to be re-projected as the “Input Layer” and the “Target CRS” as EPSG:31254-MGI/Austria GK West.  The “Reprojected” box is used to setup the file for the re-projected layer.  Press the “…” button, select “Save to File’, select the project folder and a file name for the re-projected file.   The image below shows the “Reproject Layer” window for the vector files that need to be re-projected:
+To re-project the three vector files, select “Vector” from the top menu, then “Data Management Tools” and “Reproject Layer”.
+[[File:VectorReprojectTool.jpg|center|600px]]
+On the “Reproject Layer” window, select the layer to be re-projected as the “Input Layer” and the “Target CRS” as EPSG:31254-MGI/Austria GK West.  The “Reprojected” box is used to setup the file for the re-projected layer.  Press the “…” button, select “Save to File’, select the project folder and a file name for the re-projected file.   The image below shows the “Reproject Layer” window for the vector files that need to be re-projected:
 Re-projection Window