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

2020-09-15T05:31:21Z

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

New page

{|border=1
||'''Time'''
||'''Narration'''

|-
|| 00:01
|| Welcome to this tutorial on '''Digitizing Map Data''' in '''QGIS'''.

|-
|| 00:07
|| In this tutorial, we will learn to- Create and digitize '''Point''' and '''Polygon''' shape files.

|-
|| 00:15
|| Change style and color for '''Point''' and '''Polygon''' features.

|-
|| 00:20
|| To record this tutorial I am using-

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

'''QGIS''' version 2.18

|-
|| 00:32
|| To follow this tutorial, you should be familiar with basic '''GIS''' and '''QGIS interface'''.

|-
|| 00:41
|| '''Digitizing''' is the process by which, coordinates from a map, image or other sources of data
are converted into a digital format.

|-
|| 00:52
|| The converted data can be stored as a point, line or a polygon feature in '''GIS'''.

|-
|| 01:00
||To practise this tutorial, you need to download the thematic map of '''Bangalore''' city given in the '''Code files''' link.

|-
|| 01:09
|| This is a map depicting development of '''Bangalore''' city.

|-
|| 01:15
|| Steps to download the code files.

|-
|| 01:18
|| Click on the link '''Code files, '''located below the player and save it in your folder.

|-
|| 01:25
|| Extract the downloaded zip file.

|-
|| 01:28
|| Locate''' Bangalore.jpg''' file in the extracted folder.

|-
||01:34
|| I have already downloaded the '''Code file''', extracted and saved in a folder on '''Desktop'''.

|-
||01:41
|| Double-click on the folder to open it.

|-
|| 01:45
||Right-click on '''Bangalore.jpg '''file.

|-
|| 01:49
|| From the context menu select, '''Open with QGIS Desktop'''.

|-
|| 01:56
|| '''QGIS''' interface opens.

|-
|| 01:59
|| '''QGIS Tips''' dialog-box opens. Click on '''OK '''button.

|-
|| 02:06
|| '''Coordinate Reference System Selector''' dialog-box opens.

|-
|| 02:11
|| Under the heading, '''Coordinate reference systems of the world''', Select '''WGS 84'''.

|-
|| 02:19
|| Note that '''WGS 84 '''is the most widely used geographic coordinate system.

|-
|| 02:27
|| Click on '''OK''' button at the bottom of the dialog-box.

|-
|| 02:32
|| '''Thematic map''' of '''Bangalore''' is displayed on the canvas.

|-
|| 02:38
|| Now let us create new shape file layers.

|-
|| 02:42
|| Click on '''Layer '''menu on the menu bar and select '''Create Layer''' option.

|-
|| 02:50
|| From the sub-menu, select '''New Shapefile Layer''' option.

|-
|| 02:55
|| '''New Shapefile Layer''' window opens.

|-
||02:59
||Here you can see options for 3 types of features, '''Point, Line''' and '''Polygon'''.

|-
||03:10
||By default '''Point''' option is selected.

Leave it as such.

|-
|| 03:16
|| Let the '''CRS '''be '''WGS 84.'''

|-
||03:21
|| Click on '''OK '''button at the bottom-right corner of the window.

|-
|| 03:27
|| '''Save Layer as..''' dialog-box opens.

|-
|| 03:31
|| Let us name the file as '''Point-1'''.

|-
|| 03:35
|| Select a suitable location to save the file.

I will choose '''Desktop.'''

|-
|| 03:42
|| Click on '''Save '''button at the bottom-right corner of the dialog-box.

|-
|| 03:48
|| Files will be saved on the desktop as shown here.

|-
|| 03:53
|| Back to the '''QGIS''' interface.

|-
|| 03:56
|| Notice that the file will be automatically loaded in the '''Layers Panel'''.

|-
|| 04:02
|| On this map, we will mark the locations where '''IT''' departments are established.

|-
|| 04;09
|| Scroll the center mouse button to zoom-in.

|-
|| 04:14
|| Refer to the '''legend''' at the bottom-right corner of the map for '''IT''' establishments.

|-
|| 04:21
|| '''IT''' establishments are indicated as flag symbol.

|-
|| 04:26
|| Locate the points indicating '''IT''' establishments on the map.

|-
|| 04:32
|| There are two points indicating '''IT''' establishments.

|-
|| 04:37
|| To edit or modify features on the map, we need to select the '''Toggle editing tool'''.

|-
|| 04:44
|| '''Toggle Editing '''tool is available on the top-left corner of the '''tool bar'''.

|-
||04:51
|| Click on the '''Toggle Editing '''tool to select it.

|-
|| 04:55
|| Click on''' Add Feature''' tool on the tool bar.

|-
|| 04:59
|| The cursor is now displayed as a '''crosshair''' icon.

|-
||05:04
|| Click on '''IT '''establishment symbol on the map.

|-
||05:08
|| An input-box''' Point-1 Feature Attributes''' opens.

|-
|| 05:14
|| Type 1 in the '''id''' text box. Click on''' OK''' button.

|-
|| 05:21
|| Similarly click on the second '''IT''' establishment and save the feature as 2.

Click on''' OK''' button.

|-
|| 05:31
|| Now to stop editing, again click on '''Toggle Editing''' tool on the tool bar.

|-
|| 05:38
|| '''Stop editing''' dialog-box opens.

|-
|| 05:42
|| Click on '''Save''' button.

|-
|| 05:45
|| Observe, on the map, two colored point features are created.

|-
|| 05:51
|| We can check the two features created, by opening the '''attribute table.'''

|-
|| 05:56
|| Right-click on the '''Point-1''' layer on the '''Layers''' panel.

|-
|| 06:01
|| From the context menu, select '''Open Attribute Table''' option.

|-
|| 06:06
|| In the '''Point-1: Features''' dialog-box, in '''id''' column, two points are created.

|-
|| 06:13
|| Close the '''attribute table''' dialog-box.

|-
|| 06:17
|| Style and color of these point features can be changed for clear visibility.

|-
|| 06:23
|| Right-click on the '''Point-1''' layer.

|-
|| 06:26
|| From the '''context menu '''choose '''Properties''' option.

|-
|| 06:31
|| '''Layer Properties''' dialog-box opens.

|-
|| 06:35
|| Click on the '''Color''' drop down.

|-
|| 06:38
|| Choose a color by rotating the color triangle.

|-
|| 06:42
|| Increase the size by clicking on upward arrow triangle at the end of '''Size''' text box.

|-
|| 06:50
|| Click on '''OK''' button at the bottom of the dialog-box.

|-
|| 06:54
|| Notice the change in color and size for the '''Point '''features.

|-
|| 07:00
|| Now let us create a shape file containing '''Polygon''' features.

|-
|| 07:05
|| Click on''' Layer''' menu on the '''menu bar'''. Select '''Create Layer '''option.

|-
|| 07:12
|| From the sub-menu, select '''New Shapefile Layer'''.

|-
|| 07:17
|| '''New Shape File Layer''' window opens.

|-
|| 07:21
|| Select '''Type''' as '''Polygon'''.

|-
|| 07:25
|| In the ''' New field Name '''text box''', '''type '''area.'''

|-
|| 07:31
|| Let the '''Type''' be '''Text data'''.

|-
||07:35
|| Click on '''Add to fields list''' button

|-
|| 07:40
|| In the '''Fields List''' table, you will see '''area '''row added.

Click on '''OK''' button.

|-
|| 07:50
|| '''Save layer as..''' dialog-box opens.

|-
|| 07:54
|| Type the '''File '''name as '''Area-1.'''

|-
|| 07:58
|| Select a suitable location.

|-
|| 08:01
|| I will select '''Desktop'''. Click on '''Save''' button.

|-
|| 08:07
|| Notice that '''Area-1 layer '''is added to the''' Layers panel.'''

|-
|| 08:13
|| We will mark the boundary of '''Corporation Area''' and '''Greater Bangalore''' area.

|-
|| 08:20
|| Refer to the '''Legend''' on the map to locate '''Corporation area''' and '''Greater Bangalore''' area.

|-
|| 08:28
|| Turn on the '''toggle editing''' by clicking on '''Toggle Editing '''tool on the tool bar.

|-
|| 08:35
|| Click on '''Add Feature''' tool from the tool bar.

|-
|| 08:39
|| Bring the cursor to the map.

|-
|| 08:42
|| To mark the area, click anywhere on the boundary of '''Corporation area'''.

|-
|| 08:48
|| Keep clicking on the boundary.

|-
|| 08:51
|| Warning messages may appear at the top of the canvas if the line segments intersect.

Please ignore these messages.

|-
|| 09:02
|| If you make a mistake and want to restart the marking process, press''' Esc Key''' on the keyboard.

|-
|| 09:10
|| You can start the process again.

|-
|| 09:13
|| Keep clicking on the boundary till you span the entire boundary.

|-
|| 09:24
|| Once you have marked the entire boundary, right-click to end the polygon.

|-
|| 09:30
|| '''Area-1- Feature Attributes''' input box opens.

|-
|| 09:36
|| Type 1 in the '''id''' text box.

|-
|| 09:40
|| Type '''Corporation Area''' in '''area''' text box.

|-
|| 09:45
|| Click on '''OK''' button.

|-
|| 09:48
|| Observe, on the map new '''polygon''' feature is created.

|-
|| 09:54
|| Now we will digitize '''Greater Bangalore''' region in the map.

|-
|| 09:59
|| Click on the boundary to digitize '''Greater Bangalore''' region as shown here.

|-
|| 10:12
|| After you finish digitizing, right-click to end the polygon.

|-
|| 10:18
|| In the '''Area-1 Feature Attributes''' text box, type 2 in the '''id''' text box.

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

|-
|| 10:30
|| Click on '''OK''' button.

|-
|| 10:33
|| Again click on '''Toggle Editing''' tool in the tool bar to stop editing.

|-
|| 10:39
|| Click on '''Save '''button in the '''Stop editing '''dialog box.

|-
|| 10:44
|| Right click on '''Area-1''' layer to open '''attribute table.'''

|-
|| 10:49
|| Select '''Open Attribute Table '''from the''' context menu.'''

|-
|| 10:54
|| We can see that 2 features have been created with columns '''id''' and '''area''' type.

Close the '''attribute table'''.

|-
|| 11:04
|| We can see that two polygon features have been created.

|-
|| 11:09
|| To change the color and style of polygon feature, right click on '''Area-1''' layer.

Select '''Properties '''option.

|-
|| 11:19
|| In the '''Layer Properties''' dialog-box, select '''Style''' option from the left panel.

|-
|| 11:26
|| On the top left corner of the '''drop down menu''', select '''categorized'''.

|-
|| 11:32
|| In the column drop down select '''id.'''

Click on '''Classify''' button.

|-
||11:39
|| Move the Layer transparency slider to 50 %.

|-
|| 11:44
|| Click on''' OK''' button at the bottom of the dialog-box.

|-
|| 11:49
|| Now on the map, we can see that the two '''Polygon features''' are in different color.

|-
|| 11:55
|| Details about labeling the features, will be discussed in upcoming tutorials in the series.

|-
|| 12:03
|| Let's summarize.

|-
|| 12:05
|| In this tutorial we have learnt to, Create and digitize '''Point''' and '''Polygon''' shape files.

|-
|| 12:13
|| Change style and color for '''Point''' and '''Polygon''' features.

|-
|| 12:18
|| As an Assignment, On the '''Banglaore thematic map''' (Bangalore.jpg),

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

|-
|| 12:32
|| Your completed assignment should look as shown here.

|-
|| 12:37
||The video at the following link summarises the spoken tutorial project. Please download and watch it.

|-
|| 12:45
||The spoken tutorial project team conducts workshops and gives certificates on passing online tests
For more details please write to us.

|-
|| 12:57
|| Please post your timed queries on this forum.

|-
|| 13:01
|| The Spoken Tutorial Project is funded by '''NMEICT, MHRD''' Government of India.

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

|-
||13:13
|| This tutorial is contributed by Prajwal.M from Sahyadri college of Engineering and Snehalatha from IIT Bombay.

Thank you for joining.

|}

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

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