Exploring the Hydrological Tools in QGIS - Revision history

Smitchs: clarifying that this tutorial mostly uses SAGA tools, but from the QGIS interface

2020-10-18T15:25:14Z

clarifying that this tutorial mostly uses SAGA tools, but from the QGIS interface

Smitchs: /* Conclusion */

2020-10-18T15:24:05Z

Conclusion

Smitchs: /* Data and available platforms */

2020-10-18T15:10:32Z

Data and available platforms

Smitchs: /* Introduction */

2020-10-18T15:05:33Z

Introduction

Morganbordillon: /* Data and available platforms */

2020-10-06T01:11:53Z

Data and available platforms

Morganbordillon: /* Conclusion */

2020-10-06T00:07:51Z

Conclusion

Morganbordillon: /* The hydrology toolboxes */

2020-10-05T23:02:49Z

The hydrology toolboxes

Morganbordillon: /* The hydrology toolboxes */

2020-10-05T23:02:26Z

The hydrology toolboxes

Morganbordillon: /* The hydrology toolboxes */

2020-10-05T22:59:09Z

The hydrology toolboxes

Morganbordillon: /* The hydrology toolboxes */

2020-10-05T22:58:56Z

The hydrology toolboxes

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 == Purpose ==
-The purpose of this Wiki tutorial is to demonstrate and explore various tools used for hydrological analyses using QGIS. The objective of this tutorial is to provide instructions on how to use digital elevation models (DEM) for extracting channel networks, delineating watersheds and defining a catchment area. Other open source software that can be used for hydrological analyses are ILWIS, and SAGA GIS, as demonstrated in a tutorial created in 2013, [https://dges.carleton.ca/CUOSGwiki/index.php/Exploring_Hydrological_Analyses_using_SAGA_GIS Exploring Hydrological Analyses using SAGA GIS] and another in 2014, [https://dges.carleton.ca/CUOSGwiki/index.php/Exploring_Hydrological_Analyses_using_ILWIS Exploring Hydrological Analyses using ILWIS].
+The purpose of this Wiki tutorial is to demonstrate and explore various tools used for hydrological analyses using QGIS, concentrating on the included SAGA toolbox. The objective of this tutorial is to provide instructions on how to use digital elevation models (DEM) for extracting channel networks, delineating watersheds and defining a catchment area. Other open source software that can be used for hydrological analyses are ILWIS, and SAGA GIS, as demonstrated in a tutorial created in 2013, [https://dges.carleton.ca/CUOSGwiki/index.php/Exploring_Hydrological_Analyses_using_SAGA_GIS Exploring Hydrological Analyses using SAGA GIS] and another in 2014, [https://dges.carleton.ca/CUOSGwiki/index.php/Exploring_Hydrological_Analyses_using_ILWIS Exploring Hydrological Analyses using ILWIS].
 == Introduction ==

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 == Conclusion ==
-In conclusion, we have successfully demonstrated how to use various hydrological tools offered in the free and open source software of QGIS using a DEM of the West Ottawa region and Killarney Provincial Park.  Hydrological analysis is an important resource for determining how the geography of any area interacts with water, and thus, have important applicability to safety, engineering and ecology perspectives.
+In conclusion, we have demonstrated how to use various SAGA hydrological tools offered in the free and open source software of QGIS using a DEM of the West Ottawa region and Killarney Provincial Park.  Hydrological analysis tools are an important resource for determining how the geography of any area interacts with water, and thus, have important applicability to safety, engineering and ecology perspectives.
 == Literature Cited ==

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 === Data and available platforms ===
-QGIS is a free and open source geographic information system. The current version of QGIS is 3.14.16 ‘Pi’ that was released on September 11th, 2020. When downloading the software, it is usually best to download the long term release, as it is the most stable, this would be version 3.10. QGIS is available for a variety of platforms including Windows, Mac OS, Linux and Android. Various releases for download can be found at [http://www.qgis.org/en/site/forusers/download.html the QGIS website]. The case study is using a previous version of QGIS on Mac OSX, but instructions will be given for the current version; images of windows and menus may differ relative to your version of QGIS.
+QGIS is a free and open source geographic information system. The current version of QGIS as of this tutorial revision was 3.14.16 ‘Pi,’ released on September 11th, 2020. When downloading the software, it is usually best to download the long term release, as it is the most stable; this would be version 3.10 at the time this was written. QGIS is available for a variety of platforms including Windows, Mac OS, Linux and Android. Various releases for download can be found at [http://www.qgis.org/en/site/forusers/download.html the QGIS website]. Some images show previous versions of QGIS, but instructions will be given for the current version; images of windows and menus may differ relative to your version of QGIS.
 Digital elevation models (DEM) are used for hydrological analyses. DEMs can be generated using point data sets from elevation data or from aerial imagery using remotely sensed data [http://gracilis.carleton.ca/CUOSGwiki/index.php/Exploring_the_Hydrological_Tools_in_QGIS#Literature_Cited (NRCAN, 2013)]. Downloading a point data set would generally require interpolation of the data to create a DEM. Interpolation of a DEM will not be discussed in this tutorial. Instead, we will explore the hydrological toolset using a DEM that has previously been interpolated.
-Often, the DEM data that is already interpolated can be quite large, so if you are looking to analyze a large area, it might be best to find elevation point data, and interpolate it yourself. [https://dges.carleton.ca/CUOSGwiki/index.php/Creating_IDW_and_Spline_Interpolation_Maps_Using_QGIS Here is a CUOSGWiki on how to interpolate elevation point data]. And [https://www.qgistutorials.com/en/docs/interpolating_point_data.html#:~:text=QGIS%20interpolation%20supports%20Triagulated%20Irregular,as%20mineral%20concentrations%2C%20populations%20etc. here is a QGIS tutorial on interpolation].
+Often, DEM datasets that are already interpolated can be quite large, so if you are looking to analyze a large area, it might be best to find elevation point data, and interpolate them yourself. [https://dges.carleton.ca/CUOSGwiki/index.php/Creating_IDW_and_Spline_Interpolation_Maps_Using_QGIS Here is a CUOSGWiki tutorial on how to interpolate elevation point data]. And [https://www.qgistutorials.com/en/docs/interpolating_point_data.html#:~:text=QGIS%20interpolation%20supports%20Triagulated%20Irregular,as%20mineral%20concentrations%2C%20populations%20etc. here is another QGIS tutorial on interpolation].
 A DEM of the southeastern quadrant of the outskirts of Ottawa, Ontario was used for the purpose of this tutorial. Data were obtained from the [https://library.carleton.ca/find/gis GIS Library of Carleton University] using a 3-dimensional raster data set from the Ontario Ministry of Natural Resources. The data capture terrain elevations and cover the province of Ontario with a cell resolution of 30 cm.
-A DEM of Killarney Provincial Park and surrounding areas was also used in certain cases. Data was obtained from [[http://geo1.scholarsportal.info/#r/details/_uri@=60f2fde2-b1f0-4a1c-ac89-acc32984f614 Scholars Geoportal]], which is accessible to Carleton University students and staff. It is a 3-dimensional raster data set which captures terrain elevations with a cell resolutions of 20 metres.
+A DEM of Killarney Provincial Park and surrounding areas was also used in certain cases. Data were obtained from [[http://geo1.scholarsportal.info/#r/details/_uri@=60f2fde2-b1f0-4a1c-ac89-acc32984f614 Scholars Geoportal]], which is accessible to Carleton University students and staff. It is a 3-dimensional raster data set which captures terrain elevations with a cell resolutions of 20 metres.
-Additional data sources can be found from [http://www.nrcan.gc.ca/home Natural Resources Canada], [https://geogratis.gc.ca/ Geogratis] and from the [https://www.ontario.ca/ministry-natural-resources-and-forestry Ontario Ministry of Natural Resources.] [https://library.carleton.ca/find/gis/contours-and-elevation-data Macodrum Library is also a valuable tool for finding elevation data,] they provide links to many resources, which Carleton students and faculty have access to.
+Additional data sources can be found from [http://www.nrcan.gc.ca/home Natural Resources Canada], [https://geogratis.gc.ca/ Geogratis] and from the [https://www.ontario.ca/ministry-natural-resources-and-forestry Ontario Ministry of Natural Resources.] [https://library.carleton.ca/find/gis/contours-and-elevation-data Macodrum Library is also a valuable tool for finding elevation data,] they provide links to many resources, some of which are restricted to Carleton students and faculty, but many are freely accessible.
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 == Introduction ==
-Hydrological analysis tools are important resources and are used in a variety of programs to define how the geographic range of an area interacts with water. Hydrological analysis can aid researchers and emergency personnel in identifying the source and pathway of groundwater, delineating watersheds and identifying communities prone to flooding conditions [http://gracilis.carleton.ca/CUOSGwiki/index.php/Exploring_the_Hydrological_Tools_in_QGIS#Literature_Cited (Sui et. al., 2011, Mani et al., 2014)]. A variety of programs can be used to perform hydrological analyses including ARCGIS, ILWIS and SAGA GIS. This tutorial will give instructions on using QGIS, a Free and Open Source Software for Geospatial Data (FOSS4G), for hydrogeological analyses. QGIS is an open source geographic information system that runs on various platforms including Windows, Mac OS and Linux. Using a digital elevation model of the West Ottawa region, and Killarney Provincial Park, we will demonstrate and explore hydrogeology toolsets offered by QGIS.
+Hydrological analysis tools are important resources and are used in a variety of programs to define how the geographic range of an area interacts with water. Hydrological analysis can aid researchers and emergency personnel in identifying the source and pathway of groundwater, delineating watersheds and identifying communities prone to flooding conditions [http://gracilis.carleton.ca/CUOSGwiki/index.php/Exploring_the_Hydrological_Tools_in_QGIS#Literature_Cited (Sui et. al., 2011, Mani et al., 2014)]. A variety of programs can be used to perform hydrological analyses including ARCGIS, ILWIS and SAGA GIS. This tutorial will give instructions on using QGIS, a Free and Open Source Software for Geospatial Data (FOSS4G), for hydrogeological analyses. QGIS is an open source geographic information system that runs on various platforms including Windows, Mac OS and Linux. Using a digital elevation model of the West Ottawa region, and another of Killarney Provincial Park, we will demonstrate and explore hydrogeology toolsets offered by QGIS.
 == Materials and methods ==

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 Digital elevation models (DEM) are used for hydrological analyses. DEMs can be generated using point data sets from elevation data or from aerial imagery using remotely sensed data [http://gracilis.carleton.ca/CUOSGwiki/index.php/Exploring_the_Hydrological_Tools_in_QGIS#Literature_Cited (NRCAN, 2013)]. Downloading a point data set would generally require interpolation of the data to create a DEM. Interpolation of a DEM will not be discussed in this tutorial. Instead, we will explore the hydrological toolset using a DEM that has previously been interpolated.
+Often, the DEM data that is already interpolated can be quite large, so if you are looking to analyze a large area, it might be best to find elevation point data, and interpolate it yourself. [https://dges.carleton.ca/CUOSGwiki/index.php/Creating_IDW_and_Spline_Interpolation_Maps_Using_QGIS Here is a CUOSGWiki on how to interpolate elevation point data]. And [https://www.qgistutorials.com/en/docs/interpolating_point_data.html#:~:text=QGIS%20interpolation%20supports%20Triagulated%20Irregular,as%20mineral%20concentrations%2C%20populations%20etc. here is a QGIS tutorial on interpolation].
 A DEM of the southeastern quadrant of the outskirts of Ottawa, Ontario was used for the purpose of this tutorial. Data were obtained from the [https://library.carleton.ca/find/gis GIS Library of Carleton University] using a 3-dimensional raster data set from the Ontario Ministry of Natural Resources. The data capture terrain elevations and cover the province of Ontario with a cell resolution of 30 cm.

← Older revision		Revision as of 23:02, 5 October 2020
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	There are five methods to choose from when delineating a catchment area from a DEM.		There are five methods to choose from when delineating a catchment area from a DEM.


	*[0] Deterministic 8 (D8)		*[0] Deterministic 8 (D8)

← Older revision		Revision as of 23:02, 5 October 2020
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	*Method > Choose one model to apply to the DEM data layer		*Method > Choose one model to apply to the DEM data layer


	There are five methods to choose from when delineating a catchment area from a DEM.		There are five methods to choose from when delineating a catchment area from a DEM.

← Older revision		Revision as of 22:59, 5 October 2020
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	When opening ''Terrain Analysis - Hydrology'', you will see a long list of different tools, some are very similar and it may be hard to know which to use and for what. Because the tools are part of SAGA, there is no help tab explaining how and why to use the tools. Therefore, we have created short descriptions for each tool assessed during this tutorial for additional information.		When opening ''Terrain Analysis - Hydrology'', you will see a long list of different tools, some are very similar and it may be hard to know which to use and for what. Because the tools are part of SAGA, there is no help tab explaining how and why to use the tools. Therefore, we have created short descriptions for each tool assessed during this tutorial for additional information.


	'''TOOLBOX A. Catchment Area'''		'''TOOLBOX A. Catchment Area'''

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 *Processing Tab > Toolbox > SAGA > Terrain Analysis: Hydrology.
-When opening ''Terrain Analysis - Hydrology'', you will see a long list of different tools, some are very similar and it may be hard to know which to use and for what. Accessing the help tab within each hydrology tool results in no description being available. Therefore, we have created short descriptions for each tool assessed during this tutorial for additional information.
+When opening ''Terrain Analysis - Hydrology'', you will see a long list of different tools, some are very similar and it may be hard to know which to use and for what. Because the tools are part of SAGA, there is no help tab explaining how and why to use the tools. Therefore, we have created short descriptions for each tool assessed during this tutorial for additional information.
-[[File:Hydro.png|400px]]
-''Figure 5. Example of no available help for selected tools.''
 '''TOOLBOX A. Catchment Area'''