Add a new vector layer and create a project. In the tutorial we used world continents shapefile. You can do selection by two ways. First option click select feature icon. Choose select features and select the required layer from multiple layer.
Selected screen is shown below.
Second method of selection is for very precise value.
>> Select Features by Expresion. Dialog box of selection by expression will open.
Generate Query in QGIS 3.2.1
Before generating the query you can check attribute table in QGIS. Select the field and values then tap on all uniques and select the desired value. We generated for Australian region“NAME_0” = ‘Australia’
Export or Save into new layer
For Save as, right click on layer >> click on export and choose selected feature as
After choosing save selected feature as… dialog box will appear. Choose correct location where you want to save. Otherwise QGIS will give error message like failed to save.
Map is not just a picture in GIS, they represent several hidden information of objects. So in the upcoming days we try to understand it more and unearth the hidden data. After creating Basic Map, today we try our hands on layer labeling in QGIS 3.2.1 – use and change label. For extracting more information about the object we do labeling. It makes the layer interactive.
Labels are for providing more information about the object. This layer property depends on the attributes of the layer. So, lets start
How to get label dialog box
You can reach Layer Labeling dialog box by 2 ways:
By right click the layer >> Properties>> label (icon shown below)Or, Go to layer menu, select labeling.
Above map is not looking so attractive and informative.
In Labeling Dialog Box, it will show no label.
Click over it and select Single labels
Now come to the Label with (here you need to choose the field from attributes which is to be labeled). In the previous blog you learnt that. View attribute table
Lets select Name_0 from the drop down list.
Customize Font and Size.
Click Apply (live updates are available)
Now the map of continent is label like this.
So, this makes your map more informative. But still above map is not looking so good because off overlapping labels. These label are not placed in centre of object also. Multiple labels are also can be done in QGIS.
QGIS 3.2.1 works well for creating interactive maps, using good set of tools and symbology its become easy to implement. In the previous post we learn how to open and view vector data. So, today we are Creating a Basic Map – QGIS. For creating basic map we work with the vector data. Vector data is very common data format it describes the information in points, lines and polygons.
Creating a Basic Map: Adding vector layer
If you are not familiar with QGIS user interface then check our previous article QGIS 3.2.1 GUI
In the dialog box, click on the Browse button. And navigate to the exercise data. (before using make sure to download the Exercise data)
Select the appropriate file, let say select road.shp
Here you are, this is your basic map
Save the project.
If you are absolute beginners then question comes in your mind what is attributes. No worries when we are here, attributes is a data which store information about spatial data. It gives where, what and why about spatial data in tabular form.
So for roads, the layer we loaded in our basic map we will view its attributes. ->> Click on this icon for opening attribute table or you can use F6 or Go to Layer>> Open attribute table.
->> This attribute table provides more data about road layer, the lines that you see in the map are spatial data. These lines represents the roads.
Current basic map is not so easy to read. We will make it more understandable and interactive using Symbology (use of symbol).
In the cartography design, symbology is technique to use symbols to represent graphic features of map. Visual appearance is very much important. Follow the steps for making your map more attractive –
Click two times on layer>> Layer properties dialog box will appear. Select symbology OR right on the layer>> click the layer properties in the menu. Symbology window shown below.
This all the creating a basic map – QGIS. Symbology is useful but the information contained in the layer is still hidden. In the next blog we will learn how to represent this data on map.
Hope it will be useful for GIS professional. Suggestions and feedback are most welcomed.
In GIS , geographic features are often expressed in multiple data formats. Vector and raster data are prime data formats. In this post you will know about QGIS 3.4.4 open and view vector file – shapefile, kml, dxf, geosjon etc. Vector describes geographic data into three types of geometry. Data represented in terms of points, line and polygon.
If you want to change any feature then choose Select Feature(s) and move feature to entire feature, where you want to do changes.
To save the project click the “Save” icon and designate a file location. When you re-open a project, any layers that you were using should be in the same
locations on your computer; if they are not, you will need to re-designate the appropriate file paths.
Check out step by step approach in video provided below:
Our goal is to provide new users a working knowledge of QGIS. Although we only had time for a handful of operations, I hope that you now have sufficient familiarity with QGIS to explore it further on your own. If you face any problem in implementing above steps please comment. Any suggestion are welcome.
You also publish your data on web without using QGIS visit IGIS Map Tool