QGIS/C2/Digitizing-Map-Data/English - Revision history

Snehalathak at 11:57, 23 October 2018

2018-10-23T11:57:04Z

Snehalathak at 11:52, 23 October 2018

2018-10-23T11:52:44Z

Snehalathak at 11:48, 23 October 2018

2018-10-23T11:48:02Z

Snehalathak at 11:45, 23 October 2018

2018-10-23T11:45:01Z

Snehalathak at 11:43, 23 October 2018

2018-10-23T11:43:53Z

Snehalathak at 11:42, 23 October 2018

2018-10-23T11:42:32Z

Snehalathak at 10:47, 23 October 2018

2018-10-23T10:47:39Z

Nancyvarkey at 09:31, 17 October 2018

2018-10-17T09:31:55Z

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Snehalathak at 07:35, 11 October 2018

2018-10-11T07:35:04Z

Snehalathak: Created page with " {|border=1 ||'''Visual Cue''' ||'''Narration''' |- || '''Slide Number 1''' '''Title Slide''' || Welcome to this tutorial on '''Digitizing Map Data''' in '''QGIS'''. |- || '..."

2018-10-11T07:33:22Z

Created page with " {|border=1 ||'''Visual Cue''' ||'''Narration''' |- || '''Slide Number 1''' '''Title Slide''' || Welcome to this tutorial on '''Digitizing Map Data''' in '''QGIS'''. |- || '..."

New page

{|border=1
||'''Visual Cue'''
||'''Narration'''
|-
|| '''Slide Number 1'''

'''Title Slide'''
|| Welcome to this tutorial on '''Digitizing Map Data''' in '''QGIS'''.

|-
|| '''Slide Number 2'''

'''Learning Objectives'''
|| In this tutorial, we will learn to,

Create and digitize '''Point''' and '''Polygon''' shape files.
Change style and color for '''Point''' and '''Polygon''' features.

|-
|| '''Slide Number 3'''

'''System Requirement'''
|| To record this tutorial I am using,

'''Ubuntu Linux OS '''version''' '''16.04

'''QGIS''' version 2.18

|-
|| '''Slide Number 4'''

'''Pre-requisites'''
|| To follow this tutorial, you should be familiar with basic '''GIS''' and '''QGIS''' Interface.

|-
|| '''Slide Number 5'''

'''Digitizing'''

|| '''Digitizing''' is the process by which,

coordinates from a map, image or other sources of data are converted into a digital format.

The converted data can be stored as a point, line or a polygon feature in '''GIS'''.

|-
|| '''Slide Number 6'''

'''Example map to practise'''

|| To practise this tutorial you need to download,

the thematic map of Bangalore city given in the Code files link.

This is a map depicting development of Bangalore city.

|-
|| '''Slide Number 7'''

'''Steps to download Code files'''
|| Steps to download the code files.

Click on the link '''Code files, '''located below the player and save it in your folder.

Extract the downloaded zip file.

Locate''' Bangalore.jpg''' file in the extracted folder.

|-
|| Show the map '''Bangalore.jpg''' on desktop.
|| I have already downloaded the code file, extracted and saved in a folder on desktop.

|-
|| Right-click on '''Bangalore.jpg file'''.

From the context menu select QGIS Desktop.
|| Double-click on the folder to open it.

Right-click on '''Bangalore.jpg '''file.

From the context menu select, '''Open with,''' '''QGIS Desktop'''.

|-
|| Cursor on QGIS interface.

In QGIS tips dialog-box, click on OK button.
|| '''QGIS''' interface opens.

'''QGIS''' '''Tips''' dialog-box opens.

Click on '''OK '''button.

|-
|| Cursor on '''Coordinate Reference System Selector''' dialog-box
|| '''Coordinate Reference System Selector''' dialog-box opens.

|-
|| Click on Select '''WGS 84, '''Under the heading,''' Coordinate reference systems of the world.'''

Click on '''OK''' button.
|| Under the heading, '''Coordinate reference systems of the world''', Select '''WGS 84'''.

Note that '''WGS 84 '''is the most widely used geographic coordinate system.

Click on '''OK''' button at the bottom of the dialog-box.

|-
|| Cursor on canvas.
|| '''Thematic map''' of Bangalore is displayed on the canvas.

|-
||
|| Now let us create new shape file layers.

|-
|| Click on '''Layer''' menu.

Select '''Create Layer '''option.

Click on '''New Shapefile Layer '''option.
|| Click on '''Layer '''menu on the menu bar and select '''Create Layer''' option.

From the sub-menu, click on '''New Shapefile Layer''' option.

|-
|| Cursor on '''New Shapefile Layer''' dialog box.

Point to radio buttons.

Cursor on '''Point''' radio button.

|| '''New Shapefile Layer''' window opens.

Here you can see options for 3 types of features, '''Point''', '''line''' and '''Polygon'''.

By default '''Point''' option is selected.

Leave it as such.

|-
|| Click on '''OK '''button.
|| In the '''CRS''',

Let the '''CRS '''be '''WGS 84.'''

|-
|| Click on '''OK '''button.
|| Click on '''OK '''button at the bottom-right corner of the window.

|-
|| Type '''Point-1 '''in the name field in '''Save Layer as.. '''dialog-box .

|| '''Save Layer as..''' dialog-box opens.

Let’s us name the file as '''Point-1'''.

|-
|| Select '''Desktop'''.

Click on '''Save''' button.
|| Select a suitable location to save the file.

I will choose '''Desktop.'''

Click on '''Save '''button at the bottom-right corner of the dialog-box.

|-
|| Show the desktop which has all the saved files.
|| Files will be saved on the desktop as shown here.

|-
|| Point towards the '''Point-1''' layer on Layers panel.
|| Back to the '''QGIS''' interface.

Notice that the file will be automatically loaded in the '''Layers Panel'''.

|-
|| Cursor on the map.
|| On this map, we will mark the locations where '''IT''' departments are established.

|-
|| Scroll the centre mouse button.
|| Scroll the center mouse button to zoom-in.

|-
|| Cursor on the points.

Cursor on the legend.
|| Refer to the '''legend''' at the bottom-right corner of the map for '''IT''' establishments.

'''IT''' establishments are indicated as flag symbol.

Locate the points indicating '''IT''' establishments on the map.

|-
|| Click on the symbols for IT establishments as indicated on legend.
|| There are two points indicating '''IT''' establishments.

|-
||
|| To edit or modify features on the map, we need to select the '''Toggle editing tool'''.

|-
|| Point to the '''Toggle Editing.'''
|| '''Toggle Editing '''tool available on the top-left corner of the '''tool bar'''.

|-
|| Click on the '''Toggle Editing '''tool on tool bar.
|| Click on the '''Toggle Editing '''tool to select it.

|-
|| Select '''Add Feature''' option.
|| Click on''' Add Feature''' tool on the tool bar.

|-
|| High-light the cursor (editing)
|| The cursor is now displayed as a '''crosshair''' icon.

|-
|| Click on flag symbol.
|| Click on '''IT '''establishment symbol on the map.

|-
|| '''Type I''' in the text box in '''Point-1 Feature Attribute '''input box.

Click on''' OK''' button.
|| An input-box''' Point-1 Feature Attributes''' opens.

Type 1 in the '''id text box.'''

Click on''' OK''' button.

|-
|| Click on another symbol for IT establishment.

Type 2 in the text box in '''Point-1 Feature Attribute '''input box

Click on''' OK''' button.
|| Similarly click on the second '''IT''' establishment and save the feature as 2.

Click on''' OK''' button.

|-
|| Click on '''Toggle Editing''' tool on the tool bar.
|| Now to stop editing, again click on '''Toggle Editing''' tool on the tool bar.

|-
|| click on '''Save''' button in '''Stop editing''' dialog-box.
|| '''Stop editing''' dialog-box opens, click on '''Save''' button.

|-
|| Point towards two colored dots on the map.
|| Observe, on the map, two colored point features are created.

|-
||
|| We can check the two features created, by opening the attribute table.

|-
|| Right-click on the '''Point-1''' Layer on the '''Layers''' panel.

From the context menu, select '''Open Attribute Table''' option.
|| Right-click on the '''Point-1''' Layer on the '''Layers''' panel.

From the context menu, select '''Open Attribute Table''' option.

|-
|| Point towards the created features.
|| In the '''Point1: Features''' dialog-box, in '''ID''' column, two points are created.

|-
|| Click on x symbol at the top-left corner of the '''attribute table'''.
|| Close the '''attribute table''' dialog-box.

|-
|| Cursor on the canvas.
|| Style and color of these point features can be changed for clear visibility.

|-
|| Right-click on '''Point-1''' layer.
|| Right-click on the '''Point-1''' layer.

|-
|| From the '''context menu '''choose '''Properties''' option.
|| From the '''context menu '''choose '''Properties''' option.

|-
|| Cursor on '''Layer Properties''' dialog-box.
|| '''Layer Properties''' dialog-box opens.

|-
|| Click on the '''Color''' drop down.

Rotate color triangle.
|| Click on the '''Color''' drop down.

Choose a color by rotating the color triangle.

|-
|| Click the upward arrow triangle at the end of the '''Size''' text box.
|| Increase the size by clicking on upward arrow triangle at the end of '''Size''' text box.

|-
|| Click on '''OK''' button at the bottom of the window.
|| Click on '''OK''' button at the bottom of the dialog-box.

|-
|| Cursor on '''Point''' features.
|| Notice the change in color and size for the '''Point '''features.

|-
||
|| Now let us create a shape file containing '''Polygon''' features.

|-
|| Click on''' Layer''' menu on the menu bar.

Select '''Create Layer '''option.
|| Click on''' Layer''' menu on the '''menu bar'''.

Select '''Create Layer '''option.

|-
|| Click on '''New Shapefile Layer''' option.
|| From the sub-menu, select '''New Shapefile Layer'''.

|-
|| In the '''New Shapefile Layer''' dialog box,

Click on '''Polygon''' radio button
|| '''New Shape File''' '''Layer''' window opens.

Select '''Type''' as '''Polygon'''.

|-
|| In''' New field Name '''type '''area.'''

|| In''' New field Name '''text box''', '''type '''area.'''

Let the '''Type''' be '''Text data'''

|-
|| Click on '''Add to fields list''' button.

Point to the two rows in '''Fields List''' table.

Click on '''OK''' button.
|| Click on '''Add to fields list''' button

In the '''Fields List''' table, you will see '''area '''row added.

Click on '''OK''' button.

|-
|| Type the File name as A'''rea-1 '''in

'''Save Layer as.. '''dialog-box'''.'''
|| '''Save Layer as..''' dialog-box opens.

Type the '''File '''name as '''Area-1.'''

|-
|| Select '''Desktop'''.

Click on '''Save''' button
|| Select a suitable location.

I will select '''Desktop'''.

Click on '''Save''' button.

|-
|| Point to the '''Layer''' Panel and

'''Area-1 layer.'''
|| Notice that '''Area-1 layer '''is added to the''' Layers panel.'''

|-
||
|| We will mark the boundary of '''Corporation Area''' and '''Greater Bangalore''' area.

|-
|| Point to the '''Legend '''on the map.
|| Refer to the Legend on the map to locate '''Corporation area''' and '''Greater Bangalore''' area.

|-
|| Click on '''Toggle Editing '''tool on the '''tool bar'''.
|| Turn on the '''toggle editing''' by clicking on '''Toggle Editing '''tool on the '''tool bar'''.

|-
|| Click on '''Add Feature''' tool from the tool bar. (The tool is 4<sup>th</sup> tool from left on the 2<sup>nd</sup> row on tool bar)

|| Click on '''Add Feature''' tool from the tool bar.

|-
|| Bring the cursor to the map.

Right click to end the polygon.
|| Bring the cursor to the map.

To mark the area, click anywhere on the boundary of '''corporation area'''.

|-
|| Click on the boundary of corporation area.
|| Keep clicking on the boundary.

|-
|| Point to the warning messages.
|| Warning messages may appear at the top of the canvas if the line segments intersect.

Please ignore these messages.

|-
|| Press Esc Key on the keyboard.
|| If you make a mistake and want to restart the marking process,

press''' Esc Key''' on the '''keyboard'''.

You can start the process again.

|-
|| Click on the entire boundary.
|| Keep clicking on the boundary till you span the entire boundary.

|-
|| Right click to end the polygon.
|| Once you have marked the entire boundary, Right click to end the polygon.

|-
|| In '''Area-1- Feature Attributes''' input box,

Type '''1''' in ID text box.

and '''City Corporation Area''' in '''Area''' text box.
|| '''Area-1- Feature Attributes''' input box opens.

Type '''1''' in ID text box.

Type '''Corporation Area''' in '''Area''' text box.

|-
|| Click on '''OK''' button.
|| Click on '''OK''' button.

|-
|| Point to the polygon feature.
|| Observe, on the map new '''polygon''' feature is created.

|-
||
|| Now we will digitize '''Greater Bangalore''' region in the map.

|-
|| Click on the boundary of '''Greater Bangalore''' region.
|| Click on the boundary to digitize '''Greater Bangalore''' region as shown here.

|-
|| Right-click to end the polygon.
|| After you finish digitizing,

Right-click to end the polygon.

|-
|| In the '''Area-1 Feature Attributes''' text box,

Type 2 in the '''id''' text box.

Type '''Greater Bangalore''' in the '''area '''text box.
|| In the '''Area-1 Feature Attributes''' text box,

type 2 in the '''id''' text box,

and '''Greater Bangalore''' in the '''area '''text box.

|-
|| Click on '''OK''' button.
|| Click on '''OK''' button.

|-
|| Click on '''Toggle Editing''' tool in the tool bar.
|| Again click on '''Toggle Editing''' tool in the tool bar to stop editing.

|-
|| Click on '''Save '''button in the '''stop editing '''dialog box.
|| Click on '''Save '''button in the '''stop editing '''dialog box.

|-
|| Right click on '''Area-1 '''layer in the '''layers panel'''.

Open attribute table from the '''context menu.'''
|| Right click on '''Area-1''' layer to open '''attribute table.'''

Select '''Open Attribute Table '''from the''' context menu.'''

|-
|| Click on x on the top-left corner of the '''attribute table'''.
|| We can see that 2 features have been created with the columns '''id''' and '''Area''' type.

Close the '''attribute table'''.

|-
|| Point to polygon features on the map.
|| We can see that two polygon features have been created.

|-
|| Right click '''Area-1'''

Select '''properties option '''from''' context menu.'''

|| To change the color and style of polygon feature,

Right click on '''Area-1''' layer, select '''properties '''option.

|-
|| In the '''Layer Properties''' dialog-box,

Click on '''style''' option.
|| In the '''Layer Properties''' dialog-box,

Select '''Style''' option from the left panel.

|-
|| Select '''categorized''' option from top left corner of the '''drop down menu.'''
|| On the top left corner of the '''drop down menu''',

select '''categorized'''.

|-
|| In the column drop down select '''id.'''

Click on''' Classify button.'''
|| In the column drop down select '''id.'''

Click on '''Classify''' button.

|-
|| Drag the transparency slider to 50 %.
|| Move the Layer transparency slider to 50 %.

|-
|| Click '''Ok''' button.
|| Click on''' OK''' button at the bottom of the dialog-box.

|-
|| Point to two polygon features on the map.
|| Now on the map,

we can see that the two '''Polygon features''' are in different color.

|-
||
|| Details about labeling the features will be discussed in upcoming tutorials in the series.

|-
||
|| Let's summarize.

|-
|| '''Slide Number 8'''

'''Summary'''
|| In this tutorial we have learnt to,

Create and Digitize '''Point''' and '''Polygon''' shape files.
Change style and color for '''Point''' and '''Polygon''' features.

|-
|| '''Slide Number 9'''

'''Assignment'''
|| As an Assignment,

On the Banglaore '''thematic map''' (Bangalore.jpg),

'''Digitize''' '''Industrial Estates'''
'''Digitize''' the roads on the map by creating a '''Polyline''' feature.

|-
||
|| Your completed assignment should look as shown here.

|-
|| '''Slide Number 10'''

'''About the Spoken Tutorial Project'''
||The video at the following link summarises the spoken tutorial project.
Please download and watch it.

|-
|| '''Slide Number 11'''

'''Spoken Tutorial Workshops'''
||The spoken tutorial project team conducts workshops and gives certificates on passing online tests
For more details please write to us.

|-
|| '''Slide number 12'''

'''Forum for specific questions:'''

|| Please post your timed queries on this forum.

|-
|| '''Slide number 13'''

'''Acknowledgements'''
|| The Spoken Tutorial Project is funded by '''NMEICT, MHRD''' Government of India.

More information on this mission is available at the following link.

|-
|| '''Slide number 13'''

'''Acknowledgements'''
|| This tutorial is contributed by Prajwal.M from Sahyadri college of Engineering and Snehalatha from IIT Bombay.

Thank you for joining.

|}

@@ Line 305: / Line 305: @@
 |-
 || Point towards the created features.
-|| In the '''Point1: Features''' dialog-box, in '''id''' column, two points are created.
+|| In the '''Point-1: Features''' dialog-box, in '''id''' column, two points are created.
 |-

@@ Line 160: / Line 160: @@
 |-
 || Point to '''CRS'''
-|| In the '''CRS''', let the '''CRS '''be '''WGS 84.'''
+|| Let the '''CRS '''be '''WGS 84.'''
 |-

@@ Line 57: / Line 57: @@
 ||
-*To practise this tutorial, you need to download the thematic map of '''Bangalore''' city
+To practise this tutorial, you need to download the thematic map of '''Bangalore''' city given in the '''Code files''' link.
-*given in the '''Code files''' link.

@@ Line 25: / Line 25: @@
 || To record this tutorial I am using-
-*'''Ubuntu Linux OS '''version''' '''16.04
+'''Ubuntu Linux OS '''version''' '''16.04
-*'''QGIS''' version 2.18
+'''QGIS''' version 2.18
 |-

@@ Line 90: / Line 90: @@
-From the context menu select QGIS Desktop.
+From the context menu select '''QGIS''' Desktop.
 ||Right-click on '''Bangalore.jpg '''file.
-From the context menu select, '''Open with, QGIS Desktop'''.
+From the context menu select, '''Open with QGIS Desktop'''.
 |-
-|| Cursor on QGIS interface.
+|| Cursor on '''QGIS''' interface.
@@ Line 378: / Line 378: @@
 |-
 || In''' New field Name '''type '''area.'''
+|| In the ''' New field Name '''text box''', '''type '''area.'''
-−
-−
 || In''' New field Name '''text box''', '''type '''area.'''
@@ Line 402: / Line 399: @@
 |-
-|| Type the File name as A'''rea-1 '''in
+|| Type the File name as '''Area-1 '''in
@@ Line 488: / Line 485: @@
 || In '''Area-1- Feature Attributes''' input box,
-Type '''1''' in ID text box.
+Type 1 in ID text box.
@@ Line 495: / Line 492: @@
-Type '''1''' in the'''id''' text box.
+Type 1 in the '''id''' text box.
@@ Line 555: / Line 552: @@
 |-
 || Click on x on the top-left corner of the '''attribute table'''.
-|| We can see that 2 features have been created with columns '''id''' and '''Area''' type.
+|| We can see that 2 features have been created with columns '''id''' and '''area''' type.

@@ Line 141: / Line 141: @@
 || Click on '''Layer '''menu on the menu bar and select '''Create Layer''' option.
-From the sub-menu, click on '''New Shapefile Layer''' option.
+From the sub-menu, select '''New Shapefile Layer''' option.
 |-

@@ Line 43: / Line 43: @@
 || '''Digitizing''' is the process by which,
-*coordinates from a map, image or other sources of data
+coordinates from a map, image or other sources of data
-*are converted into a digital format.
+are converted into a digital format.

← Older revision		Revision as of 07:35, 11 October 2018
Line 16:		Line 16:

	Create and digitize '''Point''' and '''Polygon''' shape files.		Create and digitize '''Point''' and '''Polygon''' shape files.
		+
	Change style and color for '''Point''' and '''Polygon''' features.		Change style and color for '''Point''' and '''Polygon''' features.