Exploring Hydrological Analyses using SAGA GIS - Revision history

Siefatfatin: /* Review Objectives */

2013-12-27T22:01:36Z

Review Objectives

2013-12-25T07:31:37Z

Review Objectives

2013-12-25T07:31:23Z

2013-12-22T18:27:23Z

Creating a Wetness Index Map

2013-12-22T18:26:56Z

Creating a Watershed map

2013-12-22T18:26:22Z

Aspect Maps and Slope Maps

2013-12-22T18:25:53Z

Filling in the Sinks of a DEM

2013-12-22T18:25:07Z

Importing DEM

2013-12-22T17:24:36Z

Filling in the Sinks of a DEM

2013-12-22T17:23:33Z

Filling in the Sinks of a DEM

← Older revision		Revision as of 22:01, 27 December 2013
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	== ~~Review~~ Objectives ==		== Conclusion -- Completed Objectives ==

	Better understand how the software works. <br>		Better understand how the software works. <br>

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 == Review Objectives ==
-Better understand how the software works
+Better understand how the software works. <br>
 Steps need to be taken in order to achieve the desired output maps that are both accurate based on the input data and informative for the specific study region and hydrologic information.
 ==References==

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 '' Figure 8. Map displaying the Wetness Index of the Lake Okanagan Region; where red shows highest wetness and blue shows driest areas. ''
+== Review Objectives ==
+Better understand how the software works
+Steps need to be taken in order to achieve the desired output maps that are both accurate based on the input data and informative for the specific study region and hydrologic information.
 ==References==

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 * After you have done this click '''Okay''' at the top right of the window.
 * This creates your '''Wetness Index Map'''.
-[[Image:SAGAWetnessIndex.bmp|400px]]
+[[Image:SAGAWetnessIndex.png|400px]]
 '' Figure 8. Map displaying the Wetness Index of the Lake Okanagan Region; where red shows highest wetness and blue shows driest areas. ''

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 Now as seen in Figure 6 an excellent watershed delineation map has been generated for the study region, however you can also see that the watershed map is projected onto just a white background causing the information to be ambiguous and provide no geospatial meaning. In order for hydrologists and/or researchers in the real world to use this map successfully you would definitely need to drape this map over an other map (like a DEM, Basemap of the study region or aspect map) that provides geospatial context to the information so that researchers can actually see which areas of the study region contribute water flow into Okanagan Lake. In this project the watershed was given geospatial context by draping it over the aspect map because this map clearly depicts the landscape of the study region and help pinpoint areas that contribute water flow to the target area.
-[[Image:UpslopeAreaWithAspect.bmp|400px]]
+[[Image:UpslopeAreaWithAspect.png|400px]]
 '' Figure 7. Watershed of Lake Okanagan, British Columbia, Canada shown draped over the aspect map in order to make the data more meaningful. ''

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 * After completing these steps click '''Okay''' at the top right of the window.
 * This will create your maps.
-[[Image:Aspect.bmp|400px]]
+[[Image:Aspect.png|400px]]
 '' Figure 4. Aspect map of the Lake Okanagan study area. ''
-[[Image:Slope.bmp|400px]]
+[[Image:Slope.png|400px]]
 '' Figure 5. Slope map of the Lake Okanagan, British Columbia, Canada study region. ''

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 * The next step is to click '''Okay''', since you generally don't need to edit the optional Minimum Slope row.
 * After all of these steps you will have a new DEM file in which all the sinks are filled, thereby making your DEM a hydrologically correct one; and this is shown in Figure 3 for the ''Lake Okanagan'' DEM.
-[[Image:DEMFilled.bmp|400px]]
+[[Image:DEMFilled.png|400px]]
 '' Figure 3. Digital Elevation Model for Lake Okanagan, British Columbia, Canada after all sinks had been filled in (Projection: NAD83(CSRS) UTM Zone 10N). ''

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 * One aspect that is important to remember when importing any file into SAGA including the DEM raster file, is that the imported file will show up in the data tab of the workspace, [[Image:DataTab.png]] however in order to visually see your data you need to double click on the file name which will open a new window entitled '''Add layer to selected map''', then select '''new''' and click '''OK'''.
 * Now the DEM is been completely and accurately imported into SAGA GIS and will be displayed like Figure 2.
-[[Image:DEM.bmp|400px]]
+[[Image:DEM.png|400px]]
 '' Figure 2. Digital Elevation Model for Lake Okanagan, British Columbia, Canada (Source: NRCan, 2013) ''

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 * Once you have done this, make sure the fields '''Filled DEM''','''Flow Directions''', and '''Watershed Basins''' through their drop down menus have '''[create]''' selected.
-[[Image:2wanglui.png|250px]]
+[[Image:2_wanglui.png|250px]]
 * The next step is to click '''Okay''', since you generally don't need to edit the optional Minimum Slope row.

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 * Once the Pre-processing menu has opened up beside the Terrain Analysis, you will need to locate the fill sinks tool titled '''Fill Sinks (Wang Lui)'''.
-[[Image:1sinking.png|250px]]
+[[Image:1_sinking.png|250px]]
 * Once you have opened the '''Fill Sinks (Wang Lui)''' tab, you select your grid system (under which your DEM data is saved) through the drop down menu beside the row entitled '''Grid System'''.