I think I am just enjoying QGIS and writing tutorials on it. So far this is my third tutorial on QGIS. I thought I should write on some basics tools that you might need on your daily task. For example creating buffer or clipping the polygon I will be using the Geoprocessing tools to demonstrate some of the task that we might use every day while editing. If you want me to write specific tutorial then please leave your message on comment section.

A. Buffer

You have to create buffer all the time, it is fixed distance around the polygon, polyline or point file. To do that open the tool from Vector > Geoprocessing Tools > Intersect. Then you assign the layer under Input layer, buffer distance and output file name.

B. Intersect

Intersect tools allow you to exclude the area that is not overlapping. To do that open the tool from Vector > Geoprocessing Tools > Intersect. You assign Input Vector layer and Intersect layer and finally assign the output file name.

intersect option

intersect output

C. Union

Union allow to merge two layer into one layer but it does not remove the boundary line. To do that open the tool from Vector > Geoprocessing Tools > Union. You assign Input Vector layer and Union layer and finally assign the output file name. Attributes from both the layer are copied.

Union

Union Output

D. Symmetrical Difference

Symmetrical Difference is opposite to intersect, it removes area that is overlapping. To do that open the tool from Vector > Geoprocessing Tools > Symmetrical Difference. You assign Input Vector layer and Difference layer and finally assign the output file name. Attributes from both the layer are copied.

Symmetrical Difference

Symmetrical Difference Output

E. Clip

Clipping allows you to clip the feature with the defined boundary line. To do that open the tool from Vector > Geoprocessing Tools > Clip. You assign Input Vector layer that you want to clip and Clip layer that's boundary line will be used to clip and finally assign the output file name. It is similar to intersection tools, only difference is input layer attributes are copied.

Clip

Clip Output

F. Difference

Difference layers allows to create area of input layer that is not overlapped. To do that open the tool from Vector > Geoprocessing Tools > Difference. You assign Input Vector layer that you want to create that is not overlapped and Difference layer that is overlapping some area of input layer and finally assign the output file name. Attribute table holds the values of input layer.

Difference

Difference Output

G. Dissolve

Dissolve layer is similar to union but in this everything is merged by the common field and it works on single layer. To do that open the tool from Vector > Geoprocessing Tools > Dissolve. You assign Input Vector layer that you want to work on and dissolve field that is common and finally assign the output file name.

Dissolve

Dissolve Output