QGIS/C2/Vector-Data-Styling/English-timed

Time	Narration
00:01	Welcome to this tutorial on Vector Data Styling in QGIS.
00:07	In this tutorial we will learn to, Load vector data in QGIS
00:14	Style vector data using, Single symbol styling , Categorized styling, Graduated styling, and
00:25	Labeling features.
00:28	To record this tutorial I am using, Ubuntu Linux OS version 16.04. QGIS version 2.18.
00:39	To follow this tutorial you should be familiar with QGIS interface.
00:46	If not, For relevant tutorials, please visit our website.
00:51	To practise this tutorial, you need to download the folder given in the Code files link, located below the player.
01:01	Extract the contents of the downloaded zip file.
01:05	Locate world.shp file in the extracted folder.
01:11	I have already downloaded the code file, extracted and saved in a folder on Desktop.
01:19	Double-click on the code-file folder to open it.
01:24	Right-click on world.shp file.
01:29	From the context menu, select Open with QGIS Desktop option.
01:36	QGIS interface opens.
01:39	QGIS Tips dialog-box opens.
01:43	Click on OK button to close the dialog-box.
01:49	World map loads on the canvas in the default style.
01:54	You can see the world layer in the Layers Panel.
01:58	Right-click on the world layer.
02:01	From the context menu, select Open Attribute Table.
02:06	Attribute table for this layer opens.
02:10	Here we can see all the data of various features embedded in row and column format.
02:18	The country names are given in the ADMIN column.
02:22	Drag the slider at bottom of the table and navigate to POP_EST column.
02:30	In this column population for various countries is listed.
02:35	Next, we will depict the population data shown here, in various styles on the world map.
02:43	Close the attribute table.
02:46	Right click on the world layer.
02:49	From the context menu select Properties option.
02:53	Layer Properties dialog-box opens.
02:57	Click on Style tab from the left panel.
03:01	Various styling options are available in the Style tab.
03:05	Click on the drop-down button located on the top left corner of the dialog-box.
03:11	You will see various styling options here.
03:15	We will explore the first three in this tutorial.
03:19	Select Single Symbol option.
03:22	This option allows you to choose a single style.
03:27	The chosen style will be applied to all the features in the layer.
03:32	Click on add Symbol layer button available under Fill panel.
03:38	Various style options appear below Symbol layer type.
03:43	Since this is a polygon dataset, we have two basic choices.
03:48	You can fill the polygon with color and fill style of your choice.
03:55	Outline color, style and width can also be changed.
04:02	Click on the drop-down arrow next to Fill drop-down.
04:06	Color triangle opens.
04:09	Rotate the color triangle to choose the required color. I will choose blue color.
04:17	Similarly, Select Outline color.
04:21	I will choose yellow.
04:25	Fill style as Dense1.
04:29	Outline style, solid line.
04:33	Outline width, 0.46 millimeters.
04:38	Various other style options are available to explore.
04:43	After you have completed the styling, click on OK button at the bottom-left corner of Layers Properties dialog-box.
04:52	On the canvas, you will see the new style applied to the layer with the style pattern you chose.
04:59	Now we will see how to map the population data.
05:03	The Single Symbol style is not very useful in mapping the population data.
05:09	Let us explore another styling option.
05:13	Right-click on world layer again and choose Properties option.
05:19	In the Layers Properties dialog-box, this time we will choose Categorized from the Style tab.
05:26	Categorized means, the features in the layer will be shown in different shades of a color.
05:33	These color shades are based on the unique values in the attribute fields.
05:39	Since we are trying to map population data, in the Column drop down we will select POP_EST.
05:48	Choose a colour ramp of your choice from the drop-down. I will choose Blues.
05:55	Click on Classify button at the bottom of the middle panel.
06:00	The panel in the middle shows various classes with corresponding values.
06:07	Click on OK button at the bottom right corner.
06:11	On the world map, you will see different countries appearing in shades of blue.
06:17	Scroll down the central mouse button to zoom-in and zoom-out the map.
06:22	Lighter shades represent lower population.
06:26	Darker shades represent higher population.
06:31	Once again open Layers Properties dialog-box.
06:37	In Style tab, click on drop drown button.
06:41	Let us explore the Graduated symbology. Select Graduated option.
06:48	Graduated symbology type allows you to break down the data in a column in unique classes.
06:55	We can choose a different style for each of the classes.
07:00	From the Column drop-down, select POP_EST.
07:06	We can think of classifying our population data into 3 classes, Low, Medium and High.
07:13	So, under Classes drop-down, select 3.
07:18	You will see that 3 classes show up in the panel with corresponding values.
07:25	Click on Classify button.
07:28	Click on Mode drop-down.
07:31	There are many Mode options available here.
07:35	To keep things simple, let us use the Quantile mode.
07:40	These modes use different statistical algorithms to break down the data into separate classes.
07:47	Also note that for an attribute to be used in Graduated style, it must be numerical field.
07:55	The numerical values can be Integer or Real values.
08:00	Attribute field with String type cannot be used with this styling option.
08:06	Click on OK button.
08:10	Now on the map you will see countries in 3 different shades of blue.
08:16	These color shades represents the population data for the country.
08:22	On the Layers Panel you will see 3 classes for this layer.
08:27	There are some more styling options available.
08:31	We can choose a different style and color for each of these classes.
08:37	Open Layer Properties dialog-box again.
08:42	In Classes tab, under Symbol column, double-click on the colored box.
08:49	Symbol Selector dialog-box opens.
08:53	In the Color drop-down option, click on the drop-down arrow. Color triangle opens.
09:01	Rotate the color triangle to choose the required color.
09:05	I will choose red color to indicate low population.
09:10	Click on OK button in the Symbol selector dialog-box.
09:15	Similarly change the color for other two classes.
09:19	I will choose yellow for the medium and green for high.
09:35	Double-click on the first row in the Legend column. Type low for the first row.
09:42	Type Medium for the second row. And High for the third row.
09:48	Double-click on the first row under Values column to edit the selected ranges.
09:54	Enter class bounds text box opens. If you wish, you may edit lower value and upper value.
10:04	For now we will leave the values unchanged. Click on OK button.
10:10	Click on OK button in the Layer Properties dialog box.
10:15	Observe the world map.
10:17	Now we have 3 different colors to represent low, medium, high population.
10:24	Observe the Layers Panel.
10:27	There are clearly marked class names and colors to represent our interpretation of the population values.
10:36	This style conveys a lot more useful map than the previous two attempts.
10:42	Let us learn how to label different features in a vector file.
10:47	For demonstration let us label the names of the countries.
10:52	Open Layer Properties dialog box again.
10:57	From the left panel, select Labels tab.
11:01	In the first text box drop-down, select Show labels for this layer.
11:08	ADMIN column in the attribute table has list of the names of the countries.
11:14	So in the Label with drop down, select ADMIN.
11:20	In the style menu, Select Buffer.
11:23	Check the Draw text buffer check box.
11:27	Size of the text can be changed according to requirement.
11:32	Select a color from the color drop-down.
11:38	Click on OK button.
11:40	On the world-map we can see the names of countries displayed.
11:46	Let us summarize,
11:48	In this tutorial we have learnt to Load vector data in QGIS
11:55	Style vector data using, Single symbol styling, Categorized styling, Graduated styling, and
12:07	Labeling features.
12:10	As an assignment,
12:12	Categorise the data set POP_EST into 5 classes.
12:19	Use Graduated styling method, Equal Interval mode.
12:24	Your completed assignment should look as shown here.
12:29	The video at the following link summarises the spoken tutorial project. Please download and watch it.
12:37	The spoken tutorial project team conducts workshops and gives certificates on passing online tests For more details please write to us.
12:48	Please post your timed queries on this forum.
12:53	The Spoken Tutorial Project is funded by NMEICT, MHRD Government of India. More information on this mission is available at the following link.
13:05	This is contributed by Prajwal.M from NIT Surathkal and Snehalatha from IIT Bombay. Thank you for joining.

Contributors and Content Editors

PoojaMoolya