PoojaMoolya at 12:13, 9 December 2020

2020-12-09T12:13:47Z

PoojaMoolya: Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 ||Welcome to this tutorial on '''Vector Data Styling''' in '''QGIS'''. |- || 00:07 ||In this tutorial we will learn to,..."

2020-09-15T05:37:58Z

Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 ||Welcome to this tutorial on '''Vector Data Styling''' in '''QGIS'''. |- || 00:07 ||In this tutorial we will learn to,..."

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{|border=1
||'''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.

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|| 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'''.

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||01:19
||Double-click on the '''code-file '''folder to open it.

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|| 01:24
||Right-click on '''world.shp '''file.

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|| 01:29
||From the context menu, select '''Open with QGIS Desktop ''' option.

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||01:36
|| QGIS interface opens.

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|| 01:39
||'''QGIS Tips''' dialog-box opens.

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|| 01:43
||Click on '''OK''' button to close the dialog-box.

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||01:49
||World map loads on the canvas in the default style.

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||01:54
||You can see the '''world''' layer in the '''Layers Panel'''.

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||01:58
|| Right-click on the '''world''' layer.

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|| 02:01
||From the context menu, select '''Open Attribute Table'''.

|-
||02:06
||'''Attribute''' table for this layer opens.

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||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.

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||02:22
||Drag the slider at bottom of the table and navigate to '''POP_EST ''' column.

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|| 02:30
|| In this column population for various countries is listed.

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||02:35
||Next, we will depict the population data shown here, in various styles on the world map.

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||02:43
||Close the '''attribute''' table.

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||02:46
|| Right click on the '''world''' layer.

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|| 02:49
||From the '''context menu''' select '''Properties''' option.

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||02:53
||'''Layer Properties''' dialog-box opens.

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||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.

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|| 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.

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||03:32
|| Click on '''add Symbol layer''' button available under '''Fill''' panel.

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||03:38
||Various style options appear below '''Symbol layer type'''.

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||03:43
||Since this is a polygon dataset, we have two basic choices.

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||03:48
||You can fill the polygon with color and fill style of your choice.

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||03:55
||'''Outline''' color, style and width can also be changed.

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||04:02
||Click on the drop-down arrow next to '''Fill '''drop-down.

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|| 04:06
||Color triangle opens.

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|| 04:09
||Rotate the color triangle to choose the required color.

I will choose blue color.
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||04:17
|| Similarly, Select ''' Outline''' color.

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|| 04:21
||I will choose yellow.

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||04:25
|| '''Fill style''' as '''Dense1'''.

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||04:29
||'''Outline style, solid line'''.

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||04:33
|| '''Outline width, '''0.46 millimeters.

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|| 04:38
||Various other style options are available to explore.

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|| 04:43
|| After you have completed the styling, click on '''OK''' button at the bottom-left corner of '''Layers Properties''' dialog-box.

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||04:52
||On the canvas, you will see the new style applied to the layer with the style pattern you chose.

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||04:59
||Now we will see how to map the population data.

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||05:03
||The '''Single Symbol''' style is not very useful in mapping the population data.

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||05:09
||Let us explore another styling option.

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|| 05;13
||Right-click on '''world''' layer again and choose '''Properties''' option.

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||05:19
||In the '''Layers Properties''' dialog-box, this time we will choose '''Categorized''' from the '''Style''' tab.

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||05:26
||'''Categorized''' means, the features in the layer will be shown in different shades of a color.

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|| 05:33
||These color shades are based on the unique values in the '''attribute fields'''.

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||05:39
||Since we are trying to map population data, in the '''Column''' drop down we will select '''POP_EST'''.

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||05:48
||Choose a colour ramp of your choice from the drop-down.

I will choose '''Blues'''.

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||05:55
||Click on '''Classify''' button at the bottom of the middle panel.

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|| 06:00
||The panel in the middle shows various classes with corresponding values.

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||06:07
||Click on '''OK''' button at the bottom right corner.

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||06:11
||On the world map, you will see different countries appearing in shades of blue.

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|| 06:17
||Scroll down the central mouse button to zoom-in and zoom-out the map.

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|| 06:22
||Lighter shades represent lower population.

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|| 06:26
||Darker shades represent higher population.

|-
||06:31
||Once again open '''Layers Properties''' dialog-box.

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|| 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.

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||07:18
||You will see that 3 classes show up in the panel with corresponding values.

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||07:25
||Click on '''Classify''' button.

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||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.
|-
|}

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+|| 05:13
 ||Right-click on '''world''' layer again and choose '''Properties''' option.
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 |-
-||12;37
+||12:37
 ||The spoken tutorial project team conducts workshops and gives certificates on passing online tests
 For more details please write to us.

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

PoojaMoolya at 12:13, 9 December 2020

PoojaMoolya: Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 ||Welcome to this tutorial on '''Vector Data Styling''' in '''QGIS'''. |- || 00:07 ||In this tutorial we will learn to,..."