Exploring Standard Statistics in QGIS - Revision history

Edwardchu: /* About GRASS */

2020-10-07T02:44:47Z

About GRASS

Edwardchu: /* About GRASS */

2020-10-07T02:39:53Z

About GRASS

Edwardchu: /* Nearest Neighbour Analysis */

2020-10-07T02:17:23Z

Nearest Neighbour Analysis

Edwardchu: /* Nearest Neighbour Analysis */

2020-10-07T02:15:50Z

Nearest Neighbour Analysis

Edwardchu: /* Nearest Neighbour Analysis */

2020-10-07T02:07:14Z

Nearest Neighbour Analysis

Edwardchu: /* Basic Statistics */

2020-10-07T01:58:12Z

Basic Statistics

Edwardchu: /* Basic Statistics */

2020-10-07T01:35:35Z

Basic Statistics

Edwardchu: /* Basic Statistics */

2020-10-07T00:52:51Z

Basic Statistics

Edwardchu: /* Basic Statistics */

2020-10-07T00:48:38Z

Basic Statistics

Edwardchu: /* Data Acquisition */

2020-10-07T00:26:02Z

Data Acquisition

@@ Line 98: / Line 98: @@
 ===About GRASS===
 For this Tutorial, QGIS is 3.10.10 was used. This version of QGIS is available with integration of GRASS version 7.8.3. When downloading the desktop version of QGIS, it comes with a separate interface that has the GRASS plugin.
-##[[File:PluginTOOL.JPG|900px|thumb|none|''Figure 15: The plugin access to GRASS in QGIS '']]
+##[[File:Plug.jpg|900px|thumb|none|''Figure 15: The plugin access to GRASS in QGIS '']]
 When opening the proper QGIS interface, there are many different plugins to choose from. When selecting the GRASS plugin, we have access to new analysis tools. You can upload GRASS data and mapsets, and use both QGIS tools and GRASS tools on it. Additionally, it works the other way around as well. You can upload QGIS data and mapsets and use both QGIS and GRASS tools on them.
 ====Advantages of GRASS within QGIS====

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 Although the program has many tools to choose from, depending on the project the user is working on, the tools may not be well suited for it or just lacking enough options. This limitation can be resolved with the integration of another software. QGIS offers approximately 400 different plugins. In this case, QGIS is compatible with GRASS and integration helps to improve its capabilities.
 ===About GRASS===
-The most recent version of QGIS is 2.12.1 Lyon and was released on November 27, 2015. This version of QGIS is available with integration of GRASS version 6.4.3. When downloading the desktop version of QGIS, it comes with a separate interface that has the GRASS plugin.
+For this Tutorial, QGIS is 3.10.10 was used. This version of QGIS is available with integration of GRASS version 7.8.3. When downloading the desktop version of QGIS, it comes with a separate interface that has the GRASS plugin.
 ##[[File:PluginTOOL.JPG|900px|thumb|none|''Figure 15: The plugin access to GRASS in QGIS '']]
 When opening the proper QGIS interface, there are many different plugins to choose from. When selecting the GRASS plugin, we have access to new analysis tools. You can upload GRASS data and mapsets, and use both QGIS tools and GRASS tools on it. Additionally, it works the other way around as well. You can upload QGIS data and mapsets and use both QGIS and GRASS tools on them.

@@ Line 71: / Line 71: @@
 # Open the '''''Nearest Neighbour Analysis''''' window under the '''''Vector > Analysis Tools''''' tab.
 ##[[File:432.jpg|800px|thumb|none|''Figure 7: Nearest neighbour tool under the analysis tools menu.'']]
-# Select the appropriate input vector layer, click '''''OK'''''.
+# Select the appropriate input vector layer, click '''''RUN'''''.
 ##[[File:nn.jpg|800px|thumb|none|''Figure 8: Nearest neighbour analysis window.'']]
 Results of this analysis are valuable, however, under the current projection the output distance is given in degrees. If meter units are desired, the data layers would have to be re-projected to a different map projection before nearest neighbour analysis is performed. Like in the previous section, if you wanted your result from the nearest neighbour analysis you'd have to go the results viewer and copy the file path and then paste it into file explorer and open the result using any notepad.

@@ Line 73: / Line 73: @@
 # Select the appropriate input vector layer, click '''''OK'''''.
 ##[[File:nn.jpg|800px|thumb|none|''Figure 8: Nearest neighbour analysis window.'']]
-Results of this analysis are valuable, however, under the current projection the output distance is given in degrees. If meter units are desired, the data layers would have to be re-projected to a different map projection before nearest neighbour analysis is performed.
+Results of this analysis are valuable, however, under the current projection the output distance is given in degrees. If meter units are desired, the data layers would have to be re-projected to a different map projection before nearest neighbour analysis is performed. Like in the previous section, if you wanted your result from the nearest neighbour analysis you'd have to go the results viewer and copy the file path and then paste it into file explorer and open the result using any notepad.
 ----

@@ Line 72: / Line 72: @@
 ##[[File:432.jpg|800px|thumb|none|''Figure 7: Nearest neighbour tool under the analysis tools menu.'']]
 # Select the appropriate input vector layer, click '''''OK'''''.
-##[[File:431a.jpg|800px|thumb|none|''Figure 8: Nearest neighbour analysis window showing results in degree units.'']]
+##[[File:nn.jpg|800px|thumb|none|''Figure 8: Nearest neighbour analysis window.'']]
 Results of this analysis are valuable, however, under the current projection the output distance is given in degrees. If meter units are desired, the data layers would have to be re-projected to a different map projection before nearest neighbour analysis is performed.

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 # Once your selection is complete, open the '''''Basic Statistics''''' window under the '''''Vector > Analysis Tools''''' tab.
 ##[[File:422.jpg|800px|thumb|none|''Figure 6: Vector > Analysis Tools tab menu.'']]
-# In the '''''Basic Statistics''''' window, select your layer of interest. Be sure to check the box '''''‘Use only selected features’'''''. The target field should be the field that the statistics are being calculated for, in the case of this tutorial, Area. Click '''''OK'''''.
+# In the '''''Basic Statistics''''' window, select your layer of interest. Be sure to check the box '''''‘Use only selected features’'''''. The target field should be the field that the statistics are being calculated for, in the case of this tutorial, Area. Click '''''RUN'''''.
 ##[[File:Stats.jpg|800px|thumb|none|''Figure 7: Basic Statistics Window showing statistics for area of urban land use in Southern Ontario.'']]
 Results will be shown in the units that correspond to your project projection. In the case of this tutorial, area statistics are displayed in m<sup>2</sup>, where total area is the sum at 0.0465 m<sup>2</sup>

@@ Line 61: / Line 61: @@
 ##[[File:Stats.jpg|800px|thumb|none|''Figure 7: Basic Statistics Window showing statistics for area of urban land use in Southern Ontario.'']]
 Results will be shown in the units that correspond to your project projection. In the case of this tutorial, area statistics are displayed in m<sup>2</sup>, where total area is the sum at 0.0465 m<sup>2</sup>
-You can pull up the results by following copying the file path in the results viewer and pasting in file explorer.
+You can pull up the results by following copying the file path in the results viewer and pasting in file explorer. See below my results
+#[[File:Resultss.jpg|800px|thumb|none|''Figure 8: Results of Basic Statistics .'']]
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@@ Line 55: / Line 55: @@
 Using the Land Use dataset, one might want to know the area of land in Southern Ontario that is classified as a particular land use. For example, the area of land considered to be built up urban area.
 # To do this, query to select all polygons from the data layer that are classified as build up urban area. This is done in the data layers attribute table.
-##[[File:421.jpg|800px|thumb|none|''Figure 4: The Select by expression window in the attribute table used to query for desired attribute in a data layer.'']]For more information on querying in QGIS, click [http://docs.qgis.org/1.8/en/docs/user_manual/working_with_vector/query_builder.html here].
+##[[File:421.jpg|800px|thumb|none|''Figure 5: The Select by expression window in the attribute table used to query for desired attribute in a data layer.'']]For more information on querying in QGIS, click [http://docs.qgis.org/1.8/en/docs/user_manual/working_with_vector/query_builder.html here].
 # Once your selection is complete, open the '''''Basic Statistics''''' window under the '''''Vector > Analysis Tools''''' tab.
-##[[File:422.jpg|800px|thumb|none|''Figure 5: Vector > Analysis Tools tab menu.'']]
+##[[File:422.jpg|800px|thumb|none|''Figure 6: Vector > Analysis Tools tab menu.'']]
 # In the '''''Basic Statistics''''' window, select your layer of interest. Be sure to check the box '''''‘Use only selected features’'''''. The target field should be the field that the statistics are being calculated for, in the case of this tutorial, Area. Click '''''OK'''''.
-##[[File:424.jpg|800px|thumb|none|''Figure 6: Basic Statistics Window showing statistics for area of urban land use in Southern Ontario.'']]
+##[[File:Stats.jpg|800px|thumb|none|''Figure 7: Basic Statistics Window showing statistics for area of urban land use in Southern Ontario.'']]
-Results will be shown in the units that correspond to your project projection. In the case of this tutorial, area statistics are displayed in m<sup>2</sup>, where total area is the sum at 2.79E109 m<sup>2</sup>.
+Results will be shown in the units that correspond to your project projection. In the case of this tutorial, area statistics are displayed in m<sup>2</sup>, where total area is the sum at 0.0465 m<sup>2</sup>
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@@ Line 23: / Line 23: @@
 '''''Southern Ontario Land Use (Circa 1966) – Canada Land Inventory (1:50,000)''''': This data set details the land use planning initiative set out by the Ministry of Natural Resources (MNR) that have been established for large geographic areas across Southern Ontario, Canada.
-Click the following link and enter your Carleton University student login to access the [https://proxy.library.carleton.ca/login?url=http://geo.scholarsportal.info| Scholars GeoPortal] database.
+Click the following link and enter your Carleton University student login to access the [http://geo2.scholarsportal.info.proxy.library.carleton.ca/#_lang=en| Scholars GeoPortal] database.
 # Under the '''''Search''''' tab, search and add the two datasets to your working map.
 # Under the '''''Download''''' tab, select the '''''Download by area of interest''''' option then select '''''Draw an area''''' and choose the polygon shape as your mode of drawing. Manually select the area you want to download data for by drawing directly on the map. Double click to end your selection. Note: Be sure to draw a reasonable sized region, as a region too big may or may not be able to download.